NATIONAL RADIO o B S S u E M R M V A I R N Y G

ASTRONOMY OBSERVATORY 1992 STATISTICS Cover: An image of neutral atomic hydrogen in the triple galaxy system M81 • M82 - NGC 3077. These three galaxies are gravitationally bound to one another; the mutual tidal forces are stripping the hydrogen gas out of each galaxy. Darker red in this radio image indicates an increasing concentration of hydrogen gas. The image seen here is a mosaic of twelve separate images made with the NRAO Very Large Array. VLA observers: Min Su Yun, Paul Ho and K. Y. Lo. NATIONAL RADIO ASTRONOMY OBSERVATORY

Observing Summary 1992 Statistics

February 1993 SOME HIGHLIGHTS OF THE 1992 RESEARCH PROGRAM

• The 12 Meter Telescope has been used to detect CO in the damped Lyman-alpha absorption systems at redshifts greater than 2. Such systems are thought to be the evolutionary precursors of galactic disks. The CO observations confirm this hypothesis and further demonstrate that the mass of gas involved with these systems, 1012 solar masses, is a more than sufficient reservoir of material for galaxy formation. Since the damped Lyman-alpha absorption systems emit little or no visible light, the CO observations provide the only direct way to observe these early "proto-galaxies" and to measure their properties. A critical question is when in the history of the universe the heavy elements carbon and oxygen were produced and how this material is spatially distributed. Millimeter-wave CO observations of high angular resolution have the potential to answer these questions and to provide us with a detailed view of galaxy formation.

• A recent volume-limited sample of compact dwarf (HQ) galaxies-systems experiencing outbursts of starbirth-has been studied in the 21 cm HI line with the VLA and reveals that many have "midwife" companions that do not have ongoing starbursts themselves but are likely to be causing the starbursts in the HE galaxies. HI emission was detected from companions near 19 of 28 compact dwarfs studied. The compact dwarf galaxies appear to be too small for their starbursts to be triggered by density waves, so the gravitation of the newly discovered companions is the most likely triggering mechanism. This discovery provides new information to constrain theories of both galaxy formation and of star formation within galaxies.

• The 140 Foot Telescope has been used to detect HI absorption at a redshift of 0.684 towards the smallest Einstein ring, 0218+357. Comparison with optical spectra show that the HI is associated with the lensing galaxy rather than the background quasar. Very high optical extinction is implied by both the large HI column density and the extremely red optical colors. This detection is important in providing a very accurate value for the lens redshift, which is essential in modeling the mass distribution through the lens, and in providing a check on the inferred lens mass through the width of the HI absorption. The detection also demonstrates a new approach to searching for and characterizing lens systems, and suggests that unusually red systems are the most likely ones to be detected. • The VLBA has recently been involved in the mapping of a very distant quasar, 0014+813, at 18 cm wavelength. This object has a redshift of 3.41, corresponding to a distance of more than 9 billion light-years. This is one of the first VLBI maps to achieve a sensitivity essentially at the thermal noise level It shows a long straight jet, about 6 kpc long, and much more regular than had been expected of quasars at this distance, seen as they were when the universe was young. For unknown reasons, this jet stops abruptly at a level considerably above the noise level

• A new interstellar molecule, SO*, has been detected in the shocked molecular clump IC443G, which is undergoing impact from the blast wave of the supernova remnant IC 443. Analysis shows that the SO+ cannot have formed by either ion-molecule chemistry or by non-dissociative shock chemistry, but that the reaction involved, that of S+ with OH, requires a dissociative shock. SO+ is the only known interstellar molecule requiring such shocks for its formation. It has subsequently been detected in 17 massive star-forming regions out of 20 searched, thus indicating that massive stars may require strong (dissociating) shocks for their formation, and confirming the long-held belief that shocks of some sort are necessary to initiate the gravitational collapse of the large molecular clumps involved in massive star formation.

• The VLA has detected counter-rotating gaseous disks in the "Evil-Eye Galaxy" (the Sab spiral NGC 4826) by means of high spatial and velocity resolution observations of the 21 cm HI line. The HI map reveals two distinct disks of gas, with one in the central 2 kiloparsecs counter-rotating relative to the rest of the galaxy. The inner disk, inclined 45 degrees to the outer disk, contains about half the galaxy's total gas mass. This is the first galaxy known to contain counter-rotating gaseous disks, and probably indicates a galactic merger. The structure seems quite consistent with supercomputer simulations of mergers, and raises interesting questions about the frequencies of mergers, the extent to which mergers may be responsible for shaping the Hubble sequence of galaxy types, and the lifetimes of the observable signatures of such mergers.

• VLBA observations at 43 GHz have revealed new details of drcumstellar SiO masers surrounding cool red stars. U Herculis shows a clear ring of SiO maser emission with a diameter of 16 milliarcseconds, or 7.4 AU. The maser is very close to, or within outer layers of the star itself, whose size is estimated at 10 to 20 milliarcseconds. VY Canis Majoris, which has a more complex shell (with OH, H20, and SiO masers), reveals three apparent concentrations of SiO maser activity very near the star and raises the possibility that it may be a previously unresolved multiple star system SiO masers have also been observed around five other stars. OBSERVING HOURS

1980 81828384858687888990 9192 93 9495 Calendar Year

1 40-Foot 12-Meter VLA

Fig. 1 This figure shows the hours scheduled for observing on each telescope during the last decade. Includes astronomical observing, testing, and calibration. DISTRIBUTION OF SCHEDULED OBSERVING TIME

12-Meter 140-Foot VLA

o X o3 X

1983 84 85 86 87 88 89 90 91 92 1983 84 85 86 87 88 89 90 91 92 1983 84 85 86 87 88 89 90 91 92 Calendar Year Calendar Year Calendar Year

NRAO Staff Wisitors I Testing and Calibration

Fig. 2. These graphs show the number of hours scheduled for testing and calibration, and for observing by the NRAO staff and by visitors on each telescope system during the last decade. 12-METER RADIO TELESCOPE SUMMARY

100 s* - \ JL. -i- -^ \ -^ ^ "V ./r "\ s e— n A ^ A \ A 80 L ^^ r r r s \ / •\ 1 j - 60 . \ A A \ A \ / \ (\ L I r r A 1 f A r A if h 1 h 1 a> \ —, j , j ■ Q- 40 ■t \ 1 r- ' I 5 1 \ V V V V »•_. V \ V \ V \ \ 20 1 ^SI , T y y '"' \ I /— "^ y ^ >r J t > •^ =>< V V V > ►^ J ^ ^ ^\ S' i y '-- s t »••' *s N j. I 0 t 1 ^ -.' Calendar Year

Observing Installation, Maintenance and Calibration Equipment Failure, Weather and Interference

Figi 3. This summary for each quarter of the calendar year shows the percentage of time the telescope was scheduled for observing; for routine calibration, maintenance, and installation of new experiments; and the percentage of time lost due to equipment failure, bad weather, and radio interference. The telescope is removed from service for a period of four to six weeks each summer during the wet season. This period is used for maintenance and upgrading of the instrument. For most of 1983 the telescope was out of service for the replacement of the reflecting surface and its backup structure. 140-FOOT RADIO TELESCOPE SUMMARY

100 -s - ^\ A ^ ^s Z^ s* NX 'S ^V k , r ' % j S r V j \ 80 V -/ > X V^' >y V V sx S Z \ 1 V - ^ 60 \lV - - ^ 40 A - A A - \ /•s ^- > L 20 TT—J / s */ V ^ y V »•- ^" < * ^ s ^ * ^^ »-•» — ^ •— *~-->. ^^ —• ^ .^ *«•• ... • • 0 1983 1984 1985 1986 1987 1988 1989 1990 1991 1992 Calendar Year

Observing Installation, Maintenance and Calibration Equipment Failure, Weather and Interference

Fig.4 This summary for each quarter of the calendar year shows the percentage of time the telescope was scheduled for observing; for routine calibration, maintenance, and installation of new experiments; and the percentage of time lost due to equipment failure, bad weather, and radio interference. Major improvements to the telescope system indude holographic surface tests and panel readjustments in 1987. VERY LARGE ARRAY TELESCOPE SUMMARY

IUU - - 80 ^ ^ A .— —' * "^ ^s ^ s^ "*- — —** ^N ^ — /" ^. - ^ S. V ^ * 60 - - & 40 "^ —. __ ^-. — /" N - 20 ^/ *k s\ s*. ^x ^ "•* .» ^. — ^ •>« — —. .- — — ... ■ .— "^*''^. — rC ™** -- — ^.. — .^«. —- ».^« , — ^1 — .—* *"*" k^_ —- — = 0

Calendar Year

Observing Testing, Maintenance and Calibration Downtime

Fig. 5 This summary for each quarter of the calendar year shows the percentage of time the telescope was scheduled for observing; for routine system testing, maintenance, and calibration; and the percentage of time lost due to hardware or software failure, power failure, or bad weather. FULLrTIME EMPLOYEES

ttBBft CVXAQ

1979 1980 1981 1982 1983 1984 1985 1986 1987 1988 1989 1990 1991 1992 1993 1994 Calendar Year

V77XVLA Construction Research and Operations I I VLBA Construction E-iggl 6BT Construction

Rg. 6 This figure shows the total number of NRAO full-time employees at the end of each year, projected into the future. NUMBER OF PEOPLE OBSERVING WITH NRAO TELESCOPES

1978 1979 1980 1981 1982 1983 1984 1985 1986 1987 1988 1989 1990 1991 1992 1993 Calendar Year Fig. 7 This bar chart shows for each calendar year the number of NRAO research staff and the number of NRAO postdoctorals (lansky Fellows) who used the telescopes. In addition, it shows the total number of visitor-users of NRAO telescopes and the number of institutions from which the NRAO visitors came. The significant jump in these last two categories starting in 1981 reflects the increased use of the VIA. 9 DISTRIBUTION OF TELESCOPE TIME BY PERCENT

12-M 140-Fr VLA 1992 Summary

Visitors 37% 61% 52% 50%

Students 10% 10% 9% 10%

NRAO Staff 14% 11% 11% 12%

Postdoctorals (Jansky Fellows) 2% 1% 3% 2%

Test and Calibration 36% 7% 12% 18%

Maintenance and Installation 1% 8% 11% 6%

10 DISTRIBUTION OF SCHEDULED OBSERVING PROGRAMS

IN VARIOUS RESEARCH AREAS, BY PERCENT

12-M 140-Fr VLA OVERAT.T, 1. SOLAR SYSTEM -

Sun, Planet, Satellites, and Comets 6% 0% 8% 6%

n. STRIJAR-

Pulsars, X-ray Sources, Planetry Nebulae, 7% 16% 25% 22% Circumstellar Shells, Supernova Remnants, Masers, Novae, Supemovae, and Stars

m. GALACTIC -

Galactic Structure, Center, Molecular Clouds, Hll Regions, 58% 26% 22% 27% Star Formation, Molecules, and Interstellar Medium

IV. EXTRAGALACnC -

11 INSTITUTIONS FROM WHICH VISITORS CAME TO USE NRAO TELESCOPES DURING 1992

TELESCOPES INSTITUTION 140-FT 12-M VLA

1. Air & Space Museum x 2. Alabama, University of x 3. Applied Research Corporation x 4. Arcetri Astrophysical Observatory (Italy) x x 5. Arizona, University of - Steward Obs., L & P Lab. x x x

6. Arizona State University x 7. Barcelona, University of (Spain) x 8. Beijing Astronomical Observatory (P.R. of China) x x x 9. Birmingham, University of (UK) x 10. Bologna, University of (Italy) x x

11. Bonn University (Germany) x 12. Bordeaux Observatory (France) x x 13. Boston University x x 14. Brandeis University x x 15. Budapest, University of (Hungary) x x

12 TELESCOPES INSTITUTION 140-FT 12-M VLA

16. Calgary, University of (Canada) x x 17. California, University o^ Davis x 18. California, U. of, Berkeley - Hat Creek Observatory x x x 19. California, University ot Irvine x 20. California, University of, Los Angeles x x

21. California, University of, San Diego x x 22. California, University of, Santa Barbara x x 23. Caltech - OVRA, Mt Palomar x x x 24. Cambridge University - Cavendish, Milliard, IOA x 25. Carleton College x

26. Catania University (Italy) x 27. CFA (Harvard + SAO) x x x 28. CNRS, France (CEN, Saclay) x x 29. CNPq - Observatorio Nacional (Brazil) x 30. Chalmers-Onsala Space Observatory (Sweden) x x x

31. Chicago, University of - Yerkes Observatory x 32. Chile, University of x 33. CSER (Johannesburg, South Africa) x 34. Colgate University x 35. Cologne, University of (Germany) x

13 TELESCOPES INSTITUTION 140-FT 12-M VLA

36. Colorado, University of - JDLA x x x 37. Columbia University x x 38. Cornell University x x x 39. CSIRO (Australia) x x 40. Curtin, University of (Australia) x

41. Dartmouth College x 42. DRAO (Dominion Radio Astrophysical Observatory) x 43. DTM • Carnegie Institute/Observatory x 44. Durham, University of (UK) x 45. EISCAT, Norway x

46. Edinburgh, University of (Scotland) x x 47. ESO (European Southern Obs. - Germany, Chile) x x 48. ESTEC (Netherlands) x 49. Fahad University (Saudia Arabia) x 50. Florida, University of x

51. Georgia, University of x 52. Grenoble, University of - Grenoble Observatory x x 53. Groningen, University of - Kapteyn Lab. x x 54. Hamburger Sternwarte (Germany) x 55. Hawaii, University of - Institute of Astronomy x

14 TELESCOPES INSnTUTION 140-FT 12-M VLA

56. Haystack Observatory - NEROC x x x 57. Helsinki, University of (Finland) - METSAHOVI x x 58. Heidelberg Observatory (Germany) x 59. High Altitude Observatory - NCAR x 60. Hunter CoUege (NY) x

61. IAR, Buenos Aires (Argentina) x 62. Illinois, University of - Vermillion River Obs. x x 63. Institute of Astrophysics (Granada) x x 64. Institute for A & A (Andalucia) x 65. Institute for Space Research (Russia) x x

66. Institute for Molecular Science (Japan) x 67. Interferometrics, Inc. x x 68. Inst Space & Aeronautical Sciences (Japan) x 69. Iowa, University of x x 70. Iowa State University x

71. IPAQ Pasadena x x 7Z IRAM (France, Spain) x 73. Johns Hopkins University x 74. JPL - Goldstone x x x 75. Kentucky, University of x

15 TELESCOPES INSTITUTION 140-FT 12-M VLA

76. Koln, University of (Germany) x 77. Kyung Hee University (Korea) x 78. KPNO - NOAO (National Solar Observatory) x 79. Lafayette College x 80. Laval, University of (Canada) x

81. Lebedev Physics Institute (Russia) x x 82. Leiden, University of - Huygens Laboratories x x x 83. Lockheed Research Laboratory x x 84. Los Alamos Scientific Laboratory (LANL) x 85. Louisiana State University x

86. Lowell Observatory x 87. MacQuarie, University of (Australia) x 88. Manchester, University of - Jodrell, NRAL (UK) x x 89. Marseille Observatory x x 90. Maryland, University of - Clark Lake Observatory x x

91. Massachusetts, University of - Five College Obs. x x x 92. Meudon Observatory x x 93. Mexico, University of - Inst of Astronomy (UNAM) x 94. Michigan, University of x 95. Middlebury College x

16 TELESCOPES INSTITUTION 140-Fr 12-M VLA

96. Minnesota, University of x x x 97. MTT - Lincoln Laboratories x x x 98. Montreal, University of x 99. MPIPA (Munich, Germany) x 100. MPIR (Bonn, Germany) x x x

101. MPIfEP, Garching (Germany) x 102. Mt Stromlo Observatory (Australia) x 103. NAIC - Arecibo Observatory x x 104. Nagoya University (Japan) x x 105. Nanjing Observatory (China) x

106. NASA/Ames x x 107. NASA/GSFC - Goddard x x x 108. NASA/MSFC - Huntsville x 109. Nevada, University of (@ Las Vegas) x 110. NFRA (Netherlands Foundation for Research in Astronomy) x x

111. NMIMT (New Mexico Inst of Mining and Technology) x x x 112. New Mexico, University of x 113. New Mexico State University x 114. Nobeyama Observatory (Japan) x x 115. North Carolina, University of x

___ TELESCOPES INSTITUTION 140-FT 12-M VLA

116. North Carolina State University x 117. Northern Arizona University x 118. Northwestern University x 119. NRC - Algonquin, Herzberg (Canada) x 120. NRL (Naval Research Laboratories) x x x

121. Oberlin College x x 122. Oklahoma, University of x 123. Oregon, University of x 124. Oxford University (UK) x 125. Padova Observatory (Italy) x

126. Paris Observatory x x 127. Perm State University x x x 128. Pennsylvania, University of x 129. Pittsburgh, University of - Allegheny Observatory x x 130. Preston/Lancashire Polytechnic (UK) x

131. Princeton University - Inst of Advanced Studies x x x 132. Purple Mountain Observatory (China) x 133. Queen Mary College (UK) x 134. Queens University (Canada) x 135. Raman Institute (India) x

18 TELESCOPES INSTITUTION 140-FT 12-M VLA

136. Rensselaer Pofytechnic Institute x 137. Rhodes College (Memphis) x 138. Rochester, University of x 139. Royal Greenwich Observatory (UK) x 140. Royal Observatory - UKIRT (Scotland) x x

141. Rijsuniveriteit Gent, RUG Observatory (Belgium) x 142. Sao Paulo University (Brazil) x x 143. SERC, Rutherford Appleton Laboratories (UK) x 144. Seoul National University (Korea) x 145. Southampton, University of (UK) x

146. Space Telescope Science Institute x x 147. Special Astropl^sical Observatory (Russia) x 148. St Lawrence University x 149. St Nfary's CoUege (CA) x 150. SUNY (all campi) x x

151. SFTT, ETH - Swiss Federal Institute of Technology x 152. Sydney, University of (Australia) x 153. Tasmania, University of (Australia) x 154. Tata Institute - TIFR, RAC (India) x x 155. Tel-Aviv University - Wise Observatory x

19 TELESCOPES INSTITUTION 140-FT 12-M VLA

156. Texas, University of - McDonald Observatory x x x 157. Tokyo University - Tokyo Astronomical Observatory x 158. Toledo, University of x 159. Torino University (Italy) x 160. Toronto, University of - David Dunlap Observatory x

161. Trinity College x x 162. T^fts University x 163. Turku, University of (Finland) x 164. Union College x 165. University College London (UK) x

166. USNA - United States Naval Academy x 167. USNO - United States Naval Observatory x x 168. Utrecht, University of - Astr. Inst (Netherlands) x 169. Vanderbilt University x 170. Vassar College x

171. Villanova University x 172. Virginia, University of x x 173. Virginia Polytechnic Institute & State University x 174. Wales, University of, Cardiff x 175. Washington, University of x

20 TELESCOPES INSTITUTION 140-FT 12-M VLA

176. Wellesley College x 177. Wesleyan University (Connecticut) x 178. West Virginia University x 179. Wisconsin, University of - Washburn Observatory x x 180. Yebes Observatory - CAY (Spain) x x x

181. York University (Canada)

Number of Institutions 68 48 156

Number of Visitors 168 79 561 Number of Students 26 25 114 Number of Research Associates 4 1 11 Number of Permanent Staff

Total Observers 209 114 721

All told, 804 visitors, including 145 students, from 181 institutions.

21 NRAO STUDENT PROGRAM

200

I Summer Undergraduate est. 180 \ Co-op E22 Summer Graduate ® WlPh.D. K'5 s«2 160 NP

140 ^1

120 i llOO 3 jri I 80

60

40

20 I 1 Ml I 1978 1979 1980 1981 1982 1983 1984 1985 1986 1987 1988 1989 1990 1991 1992 1993 Calendar Year Rg. 8 This figure shows for each calendar year the number of PhD students (salaried and non-salaried), co-op students, and summer undergraduate and graduate students who observed or worked at the NRAO during that year. Beginning in 1987 the nutfority of the undergraduate summer students were ftmded by a separate NSF Grant for Research Experience for Undergraduates. 22 NRAO FRONT-END BOX STATUS 140 FOOT TELESCOPE FEBRUARY 1993 TECHNICAL DATA SHEET NO. 12 PAGE 1 OF 5

SYSTEM 3 dB PERSON(S) AMPLIFIER CALIBRATION RECEIVER FREQUENCY FEMPERATURE BANDWIDTH FEED TYPE POLARIZATION SWITCHING REMARKS IN VAULIE NAME (GHz) TYPE (KELVIN) (MHz) SYSTEM CHARGE

DICKE SWITCH: REFERENCE OPEN ORTHOGONAL TEMPERATURE HIGH SLEEVE 50-88 38 LINEAR ADJUSTABLE MHz DYNAMIC CROSSED RANGE 300 FROM FEED CHANGES FROM 50-86 MHz TO + DIPOLE REMOVABLE 100 TO 100.000K 110-240 MHz OR TO 450-500 MHz TRANSISTOR NORROD DUAL T«ky QUAD HYBRID ADJUSTABLE REQUIRE TWO HOURS. 50-500 MHz AT FEED FOR OR CHANNa 2 TO 2500K (OUVER) Rx BROADBAND RCP AND LCP 110-240 130 FREQUENCY CROSSED SWITCH MHz DIPOIE

CAVITY RCP FREQUENCY 450-500 FET 50-80 50 BACKED AND 450-600 MHz AMP IN 50-250 MHz Rx CROSSED SWTCH MHz AMP LCP DIPOLE 280-350 280-350 350-410 COOLED 70 MHz 450-600 GASFETAMP 60-100 CAVITY DUAL BACKED 350-420 CHANNa 60 MHz CROSSED DtPOt£S 500-750 ONE OF THE SIX FEEDS DUAL COOLED SCALAR 280-350 MHz ORTHOGONAL 600-760 GASFETAMP 60-70 250 350-420 MHz NORROD vrm UNEAR MHz DUAL CROSSED 460-600 MHz 300-1000 CHANNa FREQUENCY 500-750 MHz DIPOLES 6K (SHANK) MHz Rx SVMTCHING 760-850 MHz OR RF HYBRID 750-1000 MHz COOLED 750-860 FOR RCP CAN BE USED. TO CHANGE FEEDS REQUIRES 750-850 GASFETAMP 46-50 100 CROSSED AND LCP TWO HOURS. MHz DUAL DIPOIE CHANNa

750-1000 COOLED SCALAR 750-1000 GASFET AMP 50-70 250 TO CHANGE BETWEEN 750-850 AND MHz WIH 750-1000 Rx REQUIRES 5 DAYS DUAL CROSSED CHANNa WPOLES

COOLED SINGLE FREQUENCY 1.00-1.45 GASFET 36-40 ORTHOGONAL 4K TO 6K SWITCHING 450 BEAM UNEAR (25 CM) DUAL SCALAR CHANNa NOSE ADDING NORROD 6/25 CM ORTH CIRCULAR OTHER FEED CHANGE REQUIRED TO SWITCH BANDS SINGLE BEAM 1.4K Rx COOLED OR ORTH LINEAR POLARIZATION TAKES TWO HOURS. (SHANK) GASFET 4.47-6.06 50-60 580 OR (6 CM) DUAL CHANNa 12.8K

23 NRAO FRONT-END BOX STATUS 140 FOOT TELESCOPE FEBRUARY 1993 TECHNICAL DATA SHEET NO. 12 PAGE 2 OF 5

SYSTEM 3 dB PERSON(S) RECEIVER FREQUENCY AMPURER CALIBRATION SWITCHING TEMPERATURE BANDWIDTH FEED TYPE POLARIZATION REMARKS IN NAME (GHz) TYPE VALUE SYSTEM (KELVIN) (MHz) CHARGE

THREE 2HE FREQUENCY EITHER CIRCULAR OR UNEAR POLARIZATIONS 2K UP TO 120 SNGLE BEAM ORTHOGONAL OR ARE SELECTABLE. CIRCULAR POLARIZATION DUAL 1.30-1.36 UNEAR NORROD 1.3-1.8 GHz 1.30-1.80 CHANNa 18-25 AND POLARIZATION REQUIRES ADJUSTMENTS FROM THE CONTROL Rx COOLED HFET • Hffn 1.36-1.43 OR SMTCHING ROOM. BAND CHANGE REQUIRES 2 TO 3 UMIIfcU 1 MO-LTO I—CIRCULAR (SIMMONS) 200K OR HOURS OBSERVATIONS OUTSIDE STATED FEED ZEEMAN 1.36-1.43 NOISE ADDING BANDS POSSIBLE AT REDUCED EFFICIENCIES. CONTINUUM RECOVER. ON-AXIS HORN HAS UNCOOLED CIRCULAR 300 K LOAD OR 11 CM. 110 DSB RECOVERS ON BOTH POLARIZATIONS. FOUR NORROD 2.64-2.75 GASFET 130 3 HORNS OR 4K POLARIZATION S-FEED Rx (IF 5-55) 4 CHANNEL UNEAR OR BEAM HOURS TO CHANGE POLARIZATION. FIXED (SIMMONS) LO AT 2.695 GHz.

UP TO 250 TWO 2HE DUAL 2K BAND CHANGE REQUIRES FEED CHANGE. THIS 2.9-3.4 38±4 SINGLE BEAM ORTHOGONAL CHANNEL FEED 2.90-3.1 AND TAKES 2-3 HOURS. FREQUENCY SWITCHING COOLED FET UNEAR UNITED 150K REQUIRES 50 MS BLANKING TIME. 3.20-3.4 FREQUENCY BEHRENS 2-5 GHz SWriCHING Rx UP TO 200 NOISE ADDING (HAH) DUAL ONE 2HE 3K RECEIVER BAND LIMITED BY 4.6-4.8 GHz FEED. 4.6-6.0 CHANNa 28±5 SINGLE BEAM AND FREQUENCY SWITCHING REQUIRES 50 MS FEED CIRCULAR COOLED HFET 4*6-4.8 BLANKING TIME. LIMITED 150K

7 COOLED CORRUGATED BQIRENS 6 CM, HFET DUAL 4.6-5.1 35-45 500 HORNS 4K NONE CONTINUUM USE ONLY. 7-FEED Rx FOURTEEN CIRCULAR TOTAL POWER RF DETECTION. 3HPBW CHANNa (HAUO APART

FMsnUENCY ?■?•* FIXED UNEAR FREQUENCY OR 4.7-7.2 UPCONVERTER 30-50 60-300 CASSEGRAIN 3-7K 4.7-4.9 40-50 MASER CIRCULAR VLB NUTATDR BEAM 4.9-6.5 30-40 6.5-7.2 40-60 UPCONVERTER FIXED LINEAR FREQUENCY OR 7.6-6.5 80-80 7.6-11.2 35-80 60-300 CASSEGRAIN 3-7K MASER CIRCULAR MB MUTATOR BEAM 8S-11.2 36-45 CASSEGRAIN COOL ft) FREQUENCY OR 8-12 30-50 500 CASSEGRAIN FIXED LINEAR *-7K ONE RECOVOt AVAILABLE NOW HFET MUTATOR BEAM TWO RECOVERS READY 1993 A AND B BROCKWAY COOLED FREQUENCY OR 12-18 40-60 500 CASSEGRAIN FIXED UNEAR 3-7K ONE RECEIVER AVAILABLE NOW RECOVERS HFET MUTATOR BEAM TWO RECOVERS READY 1993 (DUNBRACK) FIXED LINEAR 18.2-25.2 MASER 40-70 60-300 CASSEGRAIN 2-6K FREQUENCY OR 18.2-25.2 CIRCULAR MB MUTATOR BEAM

COOLED FREQUENCY OR 25-35 50-80 500 CASSEGRAIN FIXED UNEAR *-7K ONE RECOVER HFET MUTATOR BEAM

24 NRAO FRONT-END BOX STATUS 12 METER TELESCOPE FEBRUARY 1993 TECHNICAL DATA SHEET NO. 12 PAGE 3 OF 5

RECEIVER CONTINUUM 3 dB PERSON(S) FREQUENCY CALIBRATION SWITCHING AMPURER TEMPERATURE SENSJTIYITY BANDWIDTH FEED TYPE POLARIZATION REMARKS IN (GHz) TYPE VALUE SYSTEM (KELVIN) iJANSKY VSR] (MHz) CHARGE

50-100 TO BE DUAL NUTATING 65-116 600 HORN-LENS SIS SSB MEASURED LINEAR 6 K SUBREFLECTOR SINGLE-SIDEBAND MIXERS LAMB

100-200 NOT DUAL NUTATING 130-170 600 HORN-LENS SIS SSB MEASURED UNEAR - SUBREFLECTOR SINGLE-SIDEBAND MIXERS LAMB

25 NRAO FRONT-END BOX STATUS VERY LARGE ARRAY FEBRUARY 1993 TECHNICAL DATA SHEET NO. 12 PAGE 4 OF 5

SYSTEM 3 dB PERSON(S) FREQUENO AMPURER CALIBRATION SWITCHING TEMPERATURE BANDWIDTH FEED TYPE POLARIZATION REMARKS IN (MHz) TYPE VALUE SYSTEM (KaviN) (MHz) CHARGE

DUAL NOISE WJECT10N, UNCOOLED 75 /\-»1200 PRIME ORTHOGONAL 120 9.6 Hz, FET as ANTENNAS 3, 6. 7. 10, 14, 20, 21 * 26 UUE CIRCULAR 60 PERCENT CYCLE.

3 MHz DUAL NOSE WJECTION, 308- UNCOOLED PRIME 150 (UMITEDBY ORTHOGONAL 10 9.6 Hz. 343 FET FOCUS UUE INTERFERENCE) CIRCULAR 60 PERCENT CYCLE. DUAL NOSE INJECTION, 1340- COOLED 60 65 CASSEGRAIN ORTHOGONAL 4 9.6 HZ. 4 ANTENNAS: 6. 9. 12 * 16 1730 FET UUE CIRCULAR 50 PERCENT CYCLE.

1340- COOLED DUAL 4 NOISE NJECTION, 35 55 CASSEGRAIN ORTHOGONAL 9.6 Hz. 23 ANTENNAS 1730 HFET UUE CIRCULAR 60 PERCENT CYCLE.

NOSE INJECTION, 4500- COOLED DUAL 4 60 55 CASSEGRAIN ORTHOGONAL 9.6 HZ. 5000 HFET UUE CIRCULAR 60 PERCENT CYCLE.

6000- COOLED DUAL NOISE INJECTION. 35 55 CASSEGRAIN ORTHOGONAL 4 9.6 Hz. 8800 HFET UUE CIRCULAR 50 PERCENT CYCLE.

14400- COOLED DUAL NOSE INJECTION. 110 55 CASSEGRAIN 15400 FET ORTHOGONAL 7 9.6 HZ. UUE CIRCULAR 60 PERCENT CYCLE.

26 NRAO FRONT-END BOX STATUS VERY LONG BASELINE ARRAY FEBRUARY 1993 TECHNICAL DATA SHECT NO. 12 PAGE 5 OF 5

SYSTEM 3 dB PERSON(S) FREQUENCY AMPURER CALIBRATION SWITCHING TEMPERAT\JRE BANDWIDTH FEED TYPE POLARIZATION REMARKS IN (MHz) TYPE VALUE SYSTEM (KELVIN) (MHz) CHARGE

DUAL NOISE INJECTION, 312- WARM PRIME 200 30 ORTHOGONAL 342 FET FOCUS 10 80 Hz, UUE CIRCULAR 50 PERCENT CYCLE.

DUAL NOISE WJECTION, 596- WARM PRIME 200 30 OR 4 ORTHOGONAL 5 80 Hz. 622 FET FOCUS UUE CKOULAR 50 PERCENT CYCLE. DUAL NOSE MJECT10N, 1350- COOLED 30 128 CASSEGRAIN 80 Hz. 1750 ORTHOGONAL 2 UUE HFET CIRCULAR 50 PERCENT CYCLE.

DUAL NOSE INJECTION. 2150- COOLED 35 128 CASSEGRAIN ORTHOGONAL 2 2350 HFET 80 Hz. UUE CIRCULAR 50 PERCENT CYCLE.

DUAL NOISE INJECTION, 4600- COOLED 40 126 CASSFGRAJN ORTHOGONAL 2 5100 HFET 60 Hz. UUE CIRCULAR 50 PERCENT CYCLE.

NOSE WJECTION, 8000- COOLED DUAL 37 128 CASSEGRAIN ORTHOGONAL 3 80 Hz. 8800 HFET UUE CIRCULAR 60 PERCENT CYCLE.

DUAL NOSE INJECTION, 10200- COOLED 95 128 CASSEGRAIN ORTHOGONAL 3 80 Hz. PIE TOWN ONLY 11200 FET UUE CIRCULAR 50 PERCENT CYCLE.

DUAL NOSE INJECTION, 12000- COOLED 128 CASSEGRAIN ORTHOGONAL 4 80 Hz. 15400 60 UUE HFET CIRCULAR 50 PERCENT CYCLE.

21700- COOLED DUAL NOISE WJECTION, 100 128 CASSEGRAIN ORTHOGONAL 5 80 Hz, 24100 HFET UUE CIRCULAR 60 PERCENT CYCLE.

27 NRAO - STAFF AND VISITOR PUBLICATIONS 1992

ADLER, D.S.; LO, K.Y.; WRIGHT, M.C.H.; RYDBECK, G.; PLANTE, R.L.; ALLEN, RJ. "A Completely Sampled Aperture Plane Map of the CO Emission in MSI." ApJ. 392: 497-508, 1992.

ADLER, D.S.; ROBERTS, W.W. JR. "Ambiguities in the Identification of Giant Molecular Cloud Complexes from Longitude-Velocity Diagrams." £gl 284: 95-104, 1992.

AKUJOR, C.E. "Radio Structures of Selected Blazars at Sub-Arcsec Resolutions." In: Variability of Blazers (Cambridge, ed. Valtaoja, et al): 251-255, 1992.

AKUJOR, C.E.; JACKSON, N. "Double Extended Emission-Line System in the Radio Galaxy 0114+074S." In: Phvsics of Active Galactic Nuclei (Springer, ed. Duschl & Wagner): 384-386,1992.

AKUJOR, C.E.; JACKSON, N. "Double Emission line System in the Radio Galaxy 0114+074S." ALUM: 546-551, 1992.

ALLOIN, D.; BARVAINIS, R.; GORDON, M.A; ANTONUCCI, R.RJ. "CO Emission from Radio Quiet Quasars: New Detections Support a Thermal Origin for the FIR Emission." A&A 265: 429-436, 1992.

ANDRE, P.; DEENEY, B.D.; PHILLIPS, R.B.; LESTRADE, J.-F. "VLBI Survey of p Ophiuchi: A Population of Magnetized, Diskless Young Stellar Objects." ApJ. 401: 667-677, 1992.

ANGLADA, G.; RODRIGUEZ, L.F.; CANTO, J.; ESTALELLA, R.; TORRELLES, J.M. "Radio Continuum from the Powering Sources of the RNO 43, Haro 4-255 FIR, B335, and PV Cephei Outflows and from the Herbig Haro Object 32A" Api 225: 494-500, 1992.

APPLETON, P.N.; SCHOMBERT, J.M.; ROBSON, E.I. "A Multiwavelength Study of the Peculiar Interacting Galaxies Arp 143 = W 117: Evidence for an Emerging Ring Galaxy?" £gL 28£: 491-500,1992.

ASCHWANDEN, M J.; BASITAN, T.S.; BENZ, A.O.; BROSIUS, J.W. "Dedmetric Solar Type U-Bursts: VLA and PHOENIX Observations." Apt 221: 380-392, 1992. 28 AVERY, LW.; AMANO, T.; BELL, M.B.; FELDMAN, P.A; JOHNS, J.W.C.; MACLEOD, J.M.; MATTHEWS, H.E.; MORTON, D.C.; WASTON, J.KG.; TURNER, B.E., HAYASHI, S.S.; WATT, G.D.; WEBSTER, AS. "A Spectral Line Survey of IRC +10216 at Millimeter and Submillimeter Wavelengths." ApJS. 22: 363-385, 1992.

AVERY, LW.; AMANO, T.; BELL, M.B.; FELDMAN, P.A; JOHNS, J.W.C; MACLEOD, J.M.; MATTHEWS, H.E.; MORTON, D.C.; WATSON, J.G.K.; TURNER, B.E.; HAYASHI, S.S.; WATT, G.D.; WEBSTER, AS. "Sub-Millimetre Observations of SiCC in IRC 10216." IAU Svmp.. 150: 399-400, 1992.

BAAN, W.A; GOSS, W.M. "Formaldehyde Absorption in the Nucleus of NGC 3628." Api 285: 188-192, 1992.

BAAN, WA.; HASCHICK, A; HENKEL, C "Hydroxyl in Galaxies. I. Surveys with the NRAO 300 ft Telescope." AL IQ2: 728-742, 1992.

BAAN, W.A; RHOADS, J.; FISHER, K.; ALTSCHULER, D.R.; HASCHICK, A "IRAS 14070+0525: An OH Gigamaser at z = 0.265." Apt 22£: L99-L102, 1992.

BAAN, W.A; RHOADS, J.; HASCHICK, AD. "OH and H I Absorption at the Nucleus of NGC 660." £pi 4Q1: 508-515, 1992.

BAATH, L.B.; ROGERS, AE.E.; ENOUE, M.; PADIN, S.; WRIGHT, M.C.H.; ZENSUS, A; KUS, AJ.; BACKER, D.C.; BOOTH, R.S.; CARLSTROM, J.E.; DICKMAN, R.L; EMERSON, D.T.; HIRABAYASHI, H.; HODGES, M.W.; KOBAYASHI, H.; LAMB, J.; MORAN, J.M.; MORIMOTO, M.; PLAMBECK, R.L.; PREDMORE, C.R.; RONNANG, B.; WOODY, D. "VLBI Observations of Active Galactic Nuclei at 3 mm." A&A 257: 31-46, 1992.

BAATH, LB.; ZHANG, FJ. "Images of the BL Lacertae Object 1749+701 and 5 GHz." A&A 262: 1-7, 1992.

BACKER, D.; SALLMEN, S.; FOSTER, R. "Pulsar's Double Period Confirmed." Nature. 358 (Letters to the Editor): 24-25, 1992.

BAILEY, N.; PAYNE, J. "A Modular 68-170 GHz Receiver for Radio Astronomy." In: Space Challenges: Earth and Beyond. (Society of Women Engineers, 1992 Proceedings): T11-T15, 1992.

BARNES, PJ.; CRUTCHER, R.M. "Orion B (NGC 2024). IBL BIMA SO Jk=22-l1 Observations - Evidence for Peculiar Sulphur Chemistry." Apt 282: 325-337, 1992. 29 BASTIAN, T.S. "Detection of the H92a Radio Recombination Line from the Symbiotic Star Hl-36 Arae." ApJ, 387: L77-L80, 1992.

BASTIAN, T.S.; GARY, D.E. "Radio Observations of the M8.1 Solar Flare of 23 June, 1988: Evidence for Energy Transport by Thermal Processes." Solar Phvs.. 139: 357-385, 1992.

BATUSKI, D J.; HANISCH, R J.; BURNS, J.O. "VLA Observations of Head-Tail Radio Sources in Poor Clusters of Galaxies." In: Extragalactic Radio Sources - From Beams to Jets (Cambridge, ed. Roland et aL): 305-306, 1992.

BATUSKI, D J.; HANISCH, R J.; BURNS, J.O. "VLA Observations of Radio Sources in Interacting Galaxy Pairs in Poor Clusters." M, 102: 1077-1083,1992.

BECKER, R.H.; HELFAND, DJ.; WHITE, R.L "The Discovery of an X-ray Selected, Radio-Loud Quasar at z=3.9.M Ai 1M: 531-534, 1992.

BECKER, R.H.; WHITE, R.L.; PROCTOR, D.D. "A Serendipitous Survey of the Galactic Plane for Type II OH Masers." At 1Q2: 544-548, 1992.

BELL, M.B.; AVERY, L.W.; MACLEOD, J.M.; MATTHEWS, H.E. "The Excitation Temperature of HQN in the Circumstellar Envelope of IRC +10216." Api 4QQ: 551-555, 1992.

BELL, M.B.; FELDMAN, P.A; AVERY, L.W. "A Sensitive Search for Rotational lines of Vibrationally Excited HC5N inIRC+10o216." Api 226: 643-648,1992.

BIETENHOLZ, M.F.; KRONBERG, P.P. "Activity and Radio Spectral Index Variations Near the Center of the Crab Nebula." Apt 222: 206-216, 1992.

BLACK, AR.S. "Sub-kpc Detail of Nearby FRQ Radio Galaxies." In: Extragalactic Radio Sources - From Beams to Jets (Cambridge, ed. Roland et aL): 302-304, 1992.

BLACK, AR.S.; BAUM, S.A; LEAHY, J.P.; PERLEY, R.A; RBLEY, J.M.; SCHEUER, P.AG. "A Study of FRE Radio Galaxies with z<0.15 -1. High-Resolution Maps of Eight Sources at 3.6 cm." MNRAS. 256: 186-208, 1992.

30 BLOEMHOF, E.E.; REID, MJ.; MORAN, J.M. "Kinematics of W3(OH): First Proper Motions of OH Masers from VLBI Measurements." Apt 222: 500-519, 1992.

BOGOD, V.M.; GELFREIKH, G.B.; WILLSON, R.F.; LANG, K.R.; OPEIKINA, L.V.; SHATDLOV, V.; TSVETKOV, S.V. "Very Large Array-RATAN 600 Observations of a Solar Active Region." Solar Phys.. 141: 303-323, 1992.

BOSMA, A; BYUN, Y.; FREEMAN, K.C.; ATHANASSOULA, E. "The Opacity of Spiral Disks." Api 4QQ: L21-L24, 1992.

BOWERS, P.F. "Location of the Dust Formation Region for Mira Variables." Api 22Q: L27-L31, 1992.

BRAUN, R.; WALTERBOS, R.AM. "Physical Properties of Neutral Gas in M31 and the Galaxy." Api 286, 120-138, 1992.

BRAUN, R.; WALTERBOS, RA.M.; KENNICUTT, R.C. "Counter-Rotating Gaseous Disks in the 'Evil Eye* Galaxy NGC4826." Nature. 360: 442-444, 1992.

BREGMAN, J.N.; HOGG, D.E.; ROBERTS, M.S. "Interstellar Matter in Early-Type Galaxies. II. The Relationship Between Gaseous Components and Galaxy Types." ApJ, 282: 484-502, 1992.

BRIDLE, AH. "Jets on Large Scales." In: Testing the AGN Paradigm (AIP, ed. Holt et aL): 386-397, 1992.

BRIGGS, D.S.; CORNWELL, TJ. "An Alternative Interpretation for the Physical Basis of CLEAN." In: Astronomical Data Analysis Software and Systems I (ASP, ed. Worrall et aL): 170-172, 1991

BROSIUS, J.W.; WILLSON, R.F.; HOLMAN, G.D.; SCHMELZ, J.T. "Coronal Magnetic Structures Observing Campaign. IV. Multiwaveband Observations of Sunspot and Plage-Associated Coronal Emission." ApJ. 286: 347-358, 1992.

BROWN, R.L.; VANDEN BOUT, PA. "[CI] Emission at z = 2.286 in the Protogalaxy IRAS F10214+4724." Api 222: L11-L14, 1992.

BROWN, R.L.; VANDEN BOUT, PA. "IRAS F10214+4724: An Extended CO Emission Source at z = 2.2867." Api 222: L19-L22,1992. 31 BURNS, J.O.; SULKANEN, M.E.; GISLER, G.R.; PERLEY, R.A "Where Have All the Cluster Halos Gone?" Api 388: L49-L52, 1992.

BURTON, W.B.; USZT, H.S. "The Gas Distribution in the Central Region of the Galaxy. V. 12CO in the Direction of the Sagittarius Source Complex." A&AS. 25: 9-39, 1992.

BUTNER, H.M. "Abundance of DCO+ in Nearby Molecular Clouds." IAU Svmp.. 150: 169-170, 1992.

CARELLI, C.L.; HOLDAWAY, M.A; HO, P.T.P.; DE PREE, C.G. "Discovery of a Synchrotron-Emitting Halo Around NGC 253." Api 222: L59-L62, 1992.

CARILU, C.L.; PERLMAN, E.S.; STOCKE, J.T. "Discovery of Neutral Hydrogen 21 Centimeter Absorption at Redshift 0.25 Towards PKS 1413+135." Api 4QQ: L13-L15, 1992.

CARILU, C.L; VAN GORKOM, J.H. "H I Imaging of Four Quasar-Galaxy Pairs: The Parent Galaxies of Low- Redshift Quasar Absorption Systems." Api 222: 373-384, 1992.

CHEN, P.C.; CORNETT, R.H.; ROBERTS, M.S.; BOHUN, R.C.; NEFF, S.G.; O'CONNELL, R.W.; PARISE, R.A; SMITH, AM.; STECHER, T.P. "Ultraviolet Imaging Telescope Ultraviolet Observations of the Scl Galaxy NGC 628 (M74)" Api 225: L41-U3, 1992.

CHENG, KP.; MICHAUTSIANOS, AG.; HINTZEN, P.M.N.; BOHUN, R.C.; O'CONNELL, R.W.; CORNETT, R.H.; ROBERTS, M.S.; SMITH, AM.; SMITH, E.P.; STECHER, T.P. "Astro-l Ultraviolet Imaging of the 30 Doradus and SN 1987A Fields with the Ultraviolet Imaging Telescope." Api 225: L29-L32, 1992.

CHURCHWELL, E.; BIEGING, J.H.; VAN DER HUCHT, KA; WILLIAMS, P.M.; SPOELSTRA, TATH.; ABBOTT, D.C "The Wolf-Rayet System WR 147: A Binary Radio Source with Thermal and Nonthermal Components." Api 222: 329-340,1992.

CHURCHWELL, E.; WALMSLEY, CM.; WOOD, D.O.S. "Hot, Dense, Molecular Gas Associated with Ultracompact H H Regions." A&A 252: 541-556, 1992.

CLANCY, R.T.; GROSSMAN, AW.; MUHLEMAN, D.O. "Mapping Mars Water Vapor with the Very Large Array." Lams, IQQ: 48-59,1992. 32 CLARK, B.G. "Radio Telescopes, Interferometers and Aperture Synthesis." In: A&A Ency. (Van Nostrand, ed. Maran): 603-605, 1992.

CLARKE, D.A; BRIDLE, AH.; BURNS, J.O.; PERLEY, RJV, NORMAN, M.L. "Origin of the Structures and Polarization in the Classical Double 3C 219." Api 285: 173-187, 1992.

CLARKE, D.A; BURNS, J.O; NORMAN, M.L. "VLA Observations of the Inner Lobes of Centaums A" Api, 225: 444-452, 1992.

CLEGG, AW.; CORDES, J.M.; SIMONETTI, J.H.; KULKARNI, S.R. "Rotation Measures of Low-Latitude Extragalactic Sources and the Magnetoionic Structure of the Galaxy." ApJT 386: 143-157, 1992.

CONDON, J J. "Far-Infrared and Radio Signatures of Starbursts and Monsters." In: Testing the AGN Paradigm (AIP, ed. Holt et aL): 629-639, 1992.

CONDON, JJ. "Radio Emission from Normal Galaxies." ARAA 2Q: 575-611, 1992.

CONDON, J J.; HUANG, Z.-P.; YIN, Q.F.; THUAN, T.X. "Compact Starbursts in Ultraluminous Infrared Galaxies." In: Relationships Between Active Galactic Nuclei and Starburst Galaxies (ASP, ed. Filippenko): 79-82, 1992.

CONWAY, J.E.; PEARSON, TJ.; READHEAD, ACS.; UNWIN, S.C.; XU, W.; MUTEL, R.L. "The Compact Triples 0710+439 and 2352+495: A New Morphology of Radio Galaxy Nuclei." Api 226: 62-79,1992.

CORNETT, R.H.; JENKINS, E.B.; BOHLIN, R.C.; CHENG, KP.; GULL, T.R.; HINTZEN, P.M.N.; O'CONNELL, R.W.; PARKER, R.AR.; ROBERTS, M.S.; SMITH, AM.; SMITH, E.P.; STECHER, T.P. "Ultraviolet Imaging Telescope Observations of the Cygnus Loop." ApJr 395: L9-L12, 1992.

CORNWELL, TJ. "Deconvolution for Real and Synthetic Apertures." In: Astronomical Data Analysis Software and Systems I (ASP, ed. Worrall et aL): 163-169, 1992.

CORNWELL, TJ.; PERLEY, R.A "Radio-Interferometric Imaging of Very Large Fields. The Problem of Non- Coplanar Arrays." A&A 261: 353-364, 1992.

33 CORNWELL, TJ.; USON, J.M.; HADDAD, N. "Radio-Interferometric Imaging of Spectral Lines: The Problem of Continuum Subtraction." A&A 258: 583-590, 1992.

CRANE, P.C.; DICKEL, J.R.; COWAN, JJ. "Detection of an Unresolved Nuclear Radio Source in M31." Api 390: L9-L12, 1992.

CRANE, P.C.; VAN DER HULST, J.M. "The Radio Jet in M51." Ai 102: 1146-1150, 1992.

CROTTS, AP.S.; LANDSMAN, W.B.; BOHLIN, R.C.; O'CONNELL, R.W.; ROBERTS, M.S.; SMITH, AM.; STECHER, T.P. "Observations of the Light Echoes from SN 1987A Using the Astro-l Ultraviolet Imaging Telescope." Api 225: L25-L27, 1992.

D'ADDARIO, LR. "Microwave Technology Innovations in Orbiting VLBI." IEEE 1992 Int. Microwave Svmp.: 1375-1378, 1992.

DAHLEM, M. "NGC 1792: Surprising Radio Properties." A&A 264: 483-488, 1992.

DANLY, L; LOCKMAN, F.J.; MEADE, M.R.; SAVAGE, B.D. "Ultraviolet and Radio Observations of Milky Way Halo Gas." ApJS. 81: 125-161, 1992.

DICKEY, J.M.; BRINKS, E. "Is the Cloud Population of M31 Different From That of the Milky Way?" In: Evolution of Interstellar Matter and Dynamics of Galaxies (Cambridge, ed. Palous et aL): 197-209, 1992.

DICKEY, J.M.; BRINKS, E.; PUCHE, D. "An Improved Method to Derive H I Absorption Spectra Through the Disks of Galaxies: Apphcation to the Sculptor Group." ApJ. 385: 501-511, 1992.

DOUGHERTY, S.M.; TAYLOR, AR. "Resolution of the Circumstellar Gas Around the Be Star i|r Persei." Nature. 252: 808-810,1992.

DOWD, AV. "Total Power Measurement in Astronomical Hybrid Spectrometers." TREE T>T Instmm. Meas.T 41: 588-594, 1992.

34 DOYLE, J.G.; KELLETT, BJ.; BUTLER, CJ.; BYRNE, P.B.; NEFF, J.E.; BROWN, A; FOX, D.; UNSKY, J.E.; BROMAGE, G.E.; AVGOLOUPIS, S.; MAVRIDIS, L.N.; SEIRADAKIS, J.H.; MATHIOUDAKIS, M.; MURPHY, H.M.; KRZESINSKI, J.; PAJDOSZ, G.; DADONAS, V.; SPERAUSKAS, J.; VAN WYK, R; MARANG, F.; OLAH, K; COLUER CAMERON, A; ANTONOPOULOU, E.; ROVTIHIS, P.; ROVTTHIS-UVANIOU, H. " Dynamic Phenomena on the RS Canum Venaticorum Binary II Pegasi in August 1989. I. Observational Data." A&ASf 2£: 351-373, 1992.

DRAKE, S.A; BOOKBINDER, J.A; FLORKOWSKI, D.R.; UNSKY, J.L; SIMON, T; STENGEL, R.E. "Four Years of Monitoring a Orionis with the VIA: Where Have All the Flares Gone?" In: Cool Stars, Stellar Systems, and the Sun 7 (ASP, ed. Giampapa & Bookbinder): 455-457, 1992.

FEY, AL.; CLAUSSEN, MJ.; GAUME, R.A; NEDOLUHA, G.E.; JOHNSTON, KJ. "The Radio Appearance of Compact H H Regions: VLA Observations of G31.28+0.06, G33.92+0.11, and G34.25+0.14." Ai 102: 234-242, 1992.

FEY, AL.; RUSSELL, J.L.; MA, C; JOHNSTON, KJ.; ARCHINAL, B.A; CARTER, M.S.; HOLDENRIED, E.R.; YAO, Z.; DE VEGT, C; ZACHARIAS, N. "A Radio Optical Reference Frame. IV. Additional Radio Source Positions in the Northern Hemisphere." Ai 1M: 891-896, 1992.

FOMALONT, E.B.; GOSS, W.M.; LYNE, AG.; MANCHESTER, R.N.; JUSTTANONT, K. "Positions and Proper Motions of Pulsars." MNRAS. 258: 497-510, 1992.

FOSTER, R.S.; FAIRHEAD, L.; BACKER, D.C. "Spectral Analysis of Four Recycled Pulsars." IAU Colloq.. 128: 150-153, 1992.

FRUCHTER, AS.; GOSS, W.M. "The Continuum Eclipse of PSR 1957+20." Api 284: I^7-L51, 1992.

FULLER, G.A; MYERS, P.C. "Dense Cores in Dark Clouds. VH. line-Width Size Relations." Api 284: 523-527, 1992.

GABUZDA, D.C; CAWTHORNE, TV.; ROBERTS, D.H.; WARDLE, J.F.C "A Survey of the MiUiarcsecond Polarization Properties of BL Lacertae Objects at 5 GHz." Api 288: 40-54,1992.

GAUNDO-ISRAEL, V.; VERUTTIPONG, W.; NORROD, R.D.; IMBRIALE, W.A "Scanning Properties of Large Dual-Shaped Offset and Symmetric Reflector Antennas." IEEE Tr. Ant Prop.. 4Q: 422-432,1992. 35 GARDNER, F.F.; WHTTEOAK, J.B.; NORRIS, R.P.; DIAMOND, P J. "VLBI Observations of HI Absorption in the Highly Luminous Galaxy NGC 5793." MMBA& 258: 296-300,1992.

GAUME, Rj\.; JOHNSTON, KJ.; WILSON, TX* "High Spatial Resolution U cm hnagiiig of the NGC 2024 Star- Forming Region." Api 288: 489-494,1992.

GIL, JJL; HANKINS, T.H.; NOWAKOWSKI, U "On the Subpulse Drift in PSR 2303+30." IAU CoUoq.. 128: 278-279, 1992.

GOPALrKRISHNA; GIRAUD, E.; MELNICK, J.; S1EPPE, H. "A Powerful, Ultra-Steep Spectrum Radio Galaxy Having an Extremely Low-Excitation Emission line Spectram." A&A 254: 42-48,1992.

GORDON, MA. "lime Variations in Millimeter-Wave Radio Recombination Lines from the Be Star MWC 349A" Api 282: 701-706,1992.

GORDON, MA.; BAARS, J.W.M.; COCKE, WJ. "Observations of Radio Lines from Unresolved Sources: Telescope Coupling, Doppler Effects, and Cosmological Corrections." A&A 261: 337-344,1992.

GOSS, W.M.; PARUSKH, YU.N.; SOBQLEVA, N.S.; TEMIROVA, A.V.; VTTKOVSKU, V.V.; ZHELENKOVA, O J.; NAUGOLNAYA, M.N. "Investigation of the RATAN-600 Steep-Spectrum Radio Sources Sample: VLA Observations and Optical Identifications." (in Russian) Astron. Zh.. £2: 673-694,1992.

GRAY, AD.; CRAM, LB.; EKERS, RX). "The Radio Counterpart of the Great Annihilator (IE 1740.7-2942)" MKRAS, 25fc 277-280,1992.

GREEN, DA; DEWDNEY, P.E. "Shocked Molecular Material Associated with the Supernova Remnant G33.60.1?" MNRAS. 254: 686-692,1992.

GUDEL, M. "Radio and X-ray Emission from Main-Sequence K Stars." A&A 264: L31-L34,1992.

GURVTTS, LX; KARDASHEV, N.S.; POPOV, M.V.; SCfflUZZI, R.T.; BARTHEL, P.D.; PAUUNY-TOTH, IXK.; KELLERMANN, KX "The Compact Radio Structure of the High Redshift Quasars 0642+449,1402+044,1614+051." A&A 26Q: 82-88, 1992. 36 GWINN, C.R.; MORAN, J.M.; REID, M J. "Distance and Kinematics of the W49N H20 Maser Outflow." Api 222: 149-164,1992.

HAN, X.; HJELLMING, R.M. "GRO J0422+32." IAU Ore. 5593: 22 August 1992.

HAN, X; HJELLMING, R.M. "Radio Observations of the 1989 Transient Event in V404 Cygni (= GS 2023+338)" Api 4QQ: 304-314,1992.

HANKINS, T.H.; IZVEKOVA, VA.; MALOFEEV, V.M.; RANKIN, J.M.; SfflTOV, Y.P.; STINEBRING, D.R. "On the Case for Magnetic Field Line Sweep-Bade in Pulsars 0950+08 and 1133+16." IAU CoUoq„ 128: 9-10,1992.

HANKINS, T.H.; RANKIN, J.M.; STINEBRING, D.R.; MCKINNON, M.M. "Two Remarkable Examples of Conal Profile Evolution." IAU Colloq.. J^: 161-164,1992.

HARRIS, H.C.; GUETTER, HJL; PIER, J.R/, ABLES, HX).; MONET, D.G.; FOLTZ, GB.; CHAFFEE, FJL; BOYLE, BJ.; IRWIN, MJ. "A Search for QSOs Behind Globular Ousters." AL 124: 53-62,1992.

HELFAND, DJ.; ZOONEMATKERMANI, S.; BECKER, R.H.; WHITE, R.L. "Contact Radio Sources Near the Galactic Plane." ApIS, SQ: 211-255, 1992.

HENNESSY, G.S.; O'CONNELL, R.W.; BOHUN, R.C; CHENG, KJ*.; COLLINS, N.R.; GUIX, T.R.; HINTZEN, P.M2*.; ISENSEE, J.E.; LANDSMAN, W.B.; ROBERTS, M^.; SMITH, AM.; SMITH, E.P.; STECHER, T.P. "Ultraviolet Imaging Telescope Observations of the Crab Nebula." ApJ. 395: L13-L16,1992.

HENNING, PA "A Study of a 21 Centimeter-Selected Sample of Galaxies. I. The Survey." ApIS, 28: 365-390,1992.

HEWITT, J.N.; TURNER, E.L.; LAWRENCE, C.R.; SCHNEIDER, DJP.; BRODY, JJP. "A Gravitational Lens Candidate with an Unusually Red Optical Counterpart" AL 104: 968-979,1992.

HILL, J.K.; BOHUN, R.C; O'CONNELL, R.W.; ROBERTS, M.S.; SMITH, AM.; HINTZEN, P.M.N.; LANDSMAN, W.B; NEFF, S.G.; SMITH, E.P.; CHENG, KP.; STECHER, T.P. "Ultraviolet Imaging Telescope Ultraviolet Images: Large-Scale Structure, H n Regions, and Extinction in M81." Api 225: L37-L40,1992.

37 HDJU R.S.; HILL, J.K.; LANDSMAN, WJB.; BOHUN, R.C; CHENG, K.P.; fflNTZHN, PJilN.; OCONNELL, R.W.; ROBERTS, M.S.; SMTIH, AM.; SMITH, EJP^ STECHER, TJ\ "An Ultraviolet Imaging Telescope Study of the Globular Ouster M79 (NGC 1904)" Api 225: L17-L20,1992.

HILL, JX; PFARR, B.B.; BOHUN, R.C; ISENSEE, JJE.; O'CONNELL, R.W.; NEFF, S.G.; ROBERTS, M.S.; SMITH, AM.; STECHER, T.P. "Ultraviolet Imaging Telescope Photometry of Massive Stars: The OB Association NGC 206 in M31." Api 225: L33-L35,1992.

HINKLE, K.H.; FEKEL, F.C; JOHNSON, D.S.; SCHARLACH, W.W.G "The Triple Symbiotic System CH Qrgm." In: Cool Stars. Stellar Systems, and the Sun 7 (ASP, ed. Giampapa & Bookbinder): 458-460,1992.

HJELLMING, R.M. "Nova Cygni 199Z" IAIII2l£« 5502: 21 April 1992.

HJELLMING, R.M. "Nova Puppis 1991." IAILCSKU 5422: 13 March 1992.

HJELLMING, R.M. "Stars, Radio Emission." In: AAA Ency. (Van Nostrand, ed. Maran): 780-783,1992.

HOLUS, J.M.; OUVERSEN, RJ.; WAGNER, R.M.; FEIBELMAN, WA. "The 0623+71 Bow Shock Nebula." Api 222: 217-224,1992. HOOIMEYER, J JLA; BARTHEL, PJ).; SCfflUZZI, RX; MILEY, GXL "Monitoring of the Superluminal Quasar 4C 34.47." A&A 2fil: 1-4,1992. HOOIMEYER, J.RA.; BARTHEL, P.D.; SCHTUZZI, R.T.; MELEY, GX "The Radio Structure of Extended Quasars. I. A VLBI Survey of the Nuclear Emission." A&A, 261: 18-24,1992.

HOOIMEYER, J.RA.; SCHIUZZI, R.T.; MBLEY, G.K.; BARTHEL, PX>. "The Radio Structure of Extended Quasars. H. The Radio Emission on pc- and kpc-Scales." A&A 261: 25-40,1992.

HOOIMEYER, J.RA.; SCHIUZZI, R.T.; MILEY, GX; BARTHEL, P.D. "Two New Candidate Superluminal Quasars: 4C 28.45 and 4C 2135." A&A 261: 5-8,1992.

HORELLOU, C; BECK, R.; BERKHUUSEN, E.M.; KRAUSE, M.; KLEIN, U. "Faraday Effects in the Spiral Galaxy M51." A&A 265: 417-428,1992. 3o HOUGH, D.H.; READHEAD, ACS.; WOOD, DA JR; FELDMEIER, J J. "Three-Epoch VLBI Observations of the Nucleus in the Lobe-Dominated Quasar 3C 334." Apt 222: 81-86, 1992.

HUFNAGEL, B.R.; BREGMAN, J.N. "Optical and Radio Variability in Blazars." Api 286: 473-484,1992.

HUMMEL, CA; MUXLOW, T.W.B.; KRICHBAUM, T.P.; QUIRRENBACH, A; SCHAUNSKI, CJ.; WTTZEL, A; JOHNSTON, KJ. "MERLIN and VLBI Observations of the Quasar 0836+710: Morphology of a Parsec-Kiloparsec Scale Jet" A&A 266: 93-100,1992.

HUMMEL, E.; JORSATER, S. "The Central Region of NGC 613 Revisited." A&A, 261: 85-93,1992.

INAGAKI, S.; ITOH, M.; SASLAW, W.C. "Gravitational Clustering of Galaxies: Comparison Between Thermodynamic Theory and N-body Simulations. HI. Velocity Distributions for Different Mass Components." Api 286: 9-18,1992.

JACOBSON, AR.; ERICKSON, W.C "A Method for Characterizing Transient Ionospheric Disturbances Using a Large Radiotelescope Array." A&A 252: 401-409,1992.

JOHNSON, D.R.H.; BARLOW, MJ.; DREW, J.E.; BRINKS, E. "A Nitrogen-Enriched Nebula Around P Cygni." MNRAS. 255: 261-266, 1992. JOHNSTON, H.M.; KULKARNI, SU. "Deep VIA Images of Globular Ousters: NGC 6624." Api 22: L17-L19, 1992. JOHNSTON, KJ.; GAUME, R.; STOLOVY, S.; WILSON, T.L.; WALMSLEY, CM.; MENTEN, K. "The Distribution of the 62-6! and 52-5, E-Type Methanol Masers in OMC-1." Api 285: 232-239,1992. KAMPHUIS, J.; BRIGGS, F. "Kinematics of the Extended HI Disk of NGC 628. High Velocity Gas and Deviations from Circular Rotation." A&A 252: 335-348,1992.

KASPI, V.M.; STINEBRING, DH. "Long-Term Pulsar Flux Monitoring and Refractive Interstellar Scintillation." Api 222: 530-541,1992.

KASSIM, RE. "330 MHz VIA Observations of 20 Galactic Supernova Remnants." AL Iffii: 943-952, 1992. 39 KASTNER, J.H. "Mass Loss Rates for ERAS-Bright Red Giants: A Revised Model of Circumstellar CO Emission." Api 401: 337-352, 1992.

KELLERMANN, KX "Reflections on the Soviet American VLBI Program." In: Astrophysics on the Threshold of the 21st Century (Gordon & Breach, ed. Kardashev): 37-51,1992.

KELLY, D.M.; LATTER, W.B.; RIEKE, G.H. "Near-Infrared Observations of AFGL 618. JL The Atomic Spectrum." Api 225: 174-184,1992.

KERR, AR.; PAN, S.-K.; UCHTENBERGER, AW.; LEA, D.M. "Progress on Tunerless SIS Mixers for the 200- 300 GHz Band." BBBB MJCTQ. QmM Wave UXU 2: 454-456,1992.

KETO, E.; PROCTOR, D.; BALL, R.; ARENS, J.; JERNIGAN, G. "The Environments of Young Stars: Mid-Infrared and Molecular line Imaging." Api 401: L113-L116,1992.

KUXEEN, N.E.B.; LO, K.Y.; CRUTCHER, R. "Zeeman Measurements of the Magnetic Fields at the Galactic Center." Api 285: 585-603,1992.

KOLLGAARD, RX; MOELLENBROCK, GA.; LAURENT-MUEHLEISEN, SA; FEIGELSON, E.D. "VIA Studies of X-Ray Selected BL Lacertae Objects." In: Testing the AGM Paradigm (AIP, ed. Holt et aL): 463-466,1992.

KOLLGAARD, RX; WARDLE, J.F.C.; ROBERTS, D.H.; GABUZDA D.C "Radio Constraints on the Nature of BL Lacertae Objects and Their Parent Population." AL 104: 1687-1705,1992.

KRICHBAUM, T.P.; QUIRRENBACH, A; WTTZEL, A "Intraday Variability of Compact Extragalactic Radio Sources." In: Variability of Blazars (Cambridge, ed. Valtaoja et aL): 331-345,1992.

KRICHBAUM, T.P.; WTTZEL, A "Structural Variability of Active Galactic Nuclei at 43 GHz." In: Variability of Blazars (Cambridge, ed. Valtaoja et aL): 205-220,1992.

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LAHAV, O.; SASLAW, W.C "Biasing and Distribution Functions for Different Galaxy Types in Optical and IRAS Catalogs." Api 226: 430-444,1992.

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LANDSMAN, W.B.; ROBERTS, M.S.; BOHLIN, R.C; O'CONNELL, R.W.; SMITH, AM.; STECHER, T.P. "The Ultraviolet Color Gradient in the Late-Type Spiral Galaxy M33." Api 401: L83-L86,1992.

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LEHAR, J.; HEWITT, J.N.; ROBERTS, D.H.; BURKE, B.F. "The Time Delay in the Double Quasar 0957+561." Api 284: 453-466,1992.

LESTRADE, J.-F.; PHILLIPS, R.B.; PRESTON, RA.; GABUZDA D.C "ffigh-Predsion VLBI Astrometry of the Radio-Emitting Star o CrB - A Step in linking the Hipparcos and Extragalactic Reference Frames." A&A 258: 112-115,1992.

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UNSKY, J.L; DRAKE, SA; BASTIAN, T.S. "The Class of Radio-Emitting Magnetic B Stars and a Wind-Fed Magnetosphere Model." In: Cool Stars, Stelfay Systems, and the Sun 7 (ASP, ed. Giampapa & Bookbinder): 325-327, 1992.

UNSKY, JJL; DRAKE, SA; BASTIAN, T.S. "Radio Emission from Chemically Peculiar Stars." Api 222: 341-356, 1992.

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LONSDALE, CJ.; LONSDALE, CJ.; SMITH, H.E. "A VLBI Search for AGN Radio Cores in Starburst Galaxies." Api 221: 629-650,1992.

LUNDGREN, S.C; CORDES, J.M.; FOSTER, R.; HANKINS, T.; ULMER, M.; GARASI, C "Crab Pulsar Giant Pulses: Simultaneous Radio and GRO Observations." In: Compton Observatory Science Workshop (NASA CP 3137r ed. Shrader et aL): 260-266,199Z

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MAOZ, D.; BAHCALL, JX; SCHNEIDER, DJ\; DOXSEY, R.; BAHCALL, NA.; FILIPPENKO, AV.; GOSS, W.M.; LAHAV, O.; YANNY, B. "A Gravitational Lens Candidate Discovered with the Hubble Space Telescope." Api 286: L1-L3,1992.

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NAUNDORF, CE.; ALEXANDER, P.; RBLEY, J.M.; BALES, S A "A Sample of 6C Sources Selected at the Peak of the Source Counts: - IV. Further Radio Observations." MKRAS, 258: 647-656,1992.

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NTTTA N.; BASTIAN, T.S.; ASCHWANDEN, MJ.; HARVEY, K.L.; STRONG, K.T. "Simultaneous Observations of Coronal Bright Points in X-ray and Radio Wavelengths." PASJ. 44, L167-172,1992.

NORROD, R.D.; SRDKANTH, S.; BAUSTER, M. "Receiver and Optics Designs for the 100-Meter Green Bank Telescope." IEEE Int. Microwave Svmp. Digest: 1365-1368, 1992.

O'CONNELL, R.W.; BOHLIN, R.C; COLUNS, Nil.; CORNETT, RJHL; HILL, J.K.; HDLL, R.S.; LANDSMAN, W.B.; ROBERTS, M.S.; SMITH, AM.; STECHER, TJP. "Ultraviolet Imaging of Old Populations in Nearby Galaxies." Api 225: U5-U8,1992.

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ODENWALD, S.; FISCHER, J.; LOCKMAN, FJ.; STEMWEDEL, S. "The Unusual Cometary Star-Forming Region G110-13." Api 222: 174-186,1992.

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PALMER, P.; SNYDER, L.E.; DE PATER, L "Radio Interferometric Observations of Cometary Molecules." IAU Sxmp«15Q: 441-442,1992.

PATNAK, AR.; BROWNE, LWA; WALSH, D.; CHAFFEE, F.H.; FOLTZ, CB. "B1422+231: A New Gravitationally Lensed System at 7=3.62." MKRAS, 252: lp-4p, 1992.

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PATTERSON, R J.; THUAN, T.X. "UGC 7636 and NGC 4472: Tidal Interaction Between a Stripped Dwarf Irregular and a Giant Elliptical Galaxy." Api 4QQ: L55-L58,1992.

PAYNE, J.M.; PARKER, D.; BRADLEY, R. "A Rangefinder with Fast Multiple Range Capability." Rev. Sci. Instmm. 62: 3311-3316,1992.

PEARSON, TJ.; BLUNDELL, K.M.; RILEY, J.M.; WARNER, PJ. "A Jet in the Nudeus of the Giant Quasar 4C 7426." MERAS,252: 13p-16p, 1992.

PEDLAR, A; HOWLEY, P.; AXON, D J.; UNGER, S.W. "A Neutral Hydrogen Study of NGC 4151." MMRA3,252: 369-380,1992.

PEDLAR, A; KUKUIA, M.; LONGLBY, D.; AXON, D.; BAUM, S.; O'DEA, C "High Sensitivity Radio Observations of NGC4151." In: Physics of Active Galactic Nuclei (Springer, ed Duschl & Wagner): 338-344,1992.

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PHILLIPS, J.P.; WILUAMS, P.G.; MAMPASO, A; UKTTA N. "The Molecular Structure of CRL 618." A&A, 26Q: 283-292,199Z

PHOOKUN, B.; MUNDY, L.G.; TEUBEN, PJ.; WAINSCOAT, RJ. "NGC 4027: An Interacting One-Armed Spiral Galaxy with a Warped Ring." Api 4QQ: 516-527,1992.

POSPIES2ALSKI, M.W. "Cryogenically-Cooled, HFET Amplifiers and Receivers: State-of-the-Art and Future Trends." IEEE Int. Microwavg Symp. Digest: 1369-1372,1992. PRATAP, P.; MENTEN, K.M.; REID, MJ.; MORAN, J.M.; WALMSLEY, CM. "VLBI Observations of Ammonia (9,6) Masers." IAIL&mp» 15Q: 345-346,1992.

PRATAP, P.; SNYDER, L.E.; BATRLA, W. "Are the NGC 7538 Formaldehyde Masers Really Unusual?" Apt 282: 241-247, 1992.

PUCHE, D.; WESTPFAHL, D.; BRINKS, E.; ROY, J.-R. "Holmberg H: A Laboratory for Stocking the Violent Interstellar Medium." Ai 102: 1841-1848,199Z

RANTAKYRO, F.T.; BAATH, L.B.; PAUUNY-TOTH, LLK.; MATVEYENKO, LJ.; UNWIN, S.C "High Dynamic Range VLBI Observations of 3C 345 at 18 cm Wavelength." A&A, 252: 8-16,1992.

REUTER, H.-P.; KLEIN, U.; LESCH, H.; WIELEBINSKI, R.; KRONBERG, P.P. "Gaps and Filaments in the Synchrotron Halo of M82. Evidence for Poloidal Magnetic Fields." A&A, 256: 10-18,1992.

RODRIGUEZ, L.F.; CANTO, J.; TORRELLES, J.M.; GOMEZ, JJ?.; HO, P.TP. "VIA Imaging of Possible Circumstellar Disk Around HL Tauri." Api 21£: L29-L31, 1992.

RODRIGUEZ, L.F.; MIRABEL, LF.; MARTI, J. "The Radio Counterpart of the Hard X-ray Source GRS 1758-258." Api 401: L15-L18,1992.

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ROELFSEMA, P.R.; GOSS, W.M.; MALUK, D.CV. "Anomalously High Apparent Abundances of Singly Ionized Helium in the Galactic H H Region W3A" Ad 224: 188-195,199Z

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RUCINSKI, S.M. "VIA Radio Ught Curves of ER Vulpeculae at 3.6 and 6 cm." PASP. 1Q4: 1177-1186,1992.

RUIZ, A; RODRIGUEZ, L.F.; CANTO, J.; MIRABEL, LF. "High-Velocity OH in Absorption: A New Tracer of Shocked Gas in Outflows?" Apt 228: 139-145,1992.

RUSSELL, AP.G.; BALLY, J.; PADMAN, R.; HILTS, ILE. "Atomic and Molecular Outflow in DR 21." Api 282: 219-228,1992.

SAGE, LJ.; SALZER, J J.; LOOSE, H.-H.; HENKEL, C "Star Formation and Molecular Clouds in Blue Compact Galaxies." A&A, 265: 19-31,1992.

SAHAI, R.; WANNEBR, P.G. "SO and S02 in Mass-Loss Envelopes of Red Giants: Probes of Nonequflibrium Circumstellar Chemistry and Mass-Loss Rates." Api 224: 320-339,1992.

SAIKIA, DJ.; HOLMES, G.F.; GARRINGTON, S.T.; PERLEY, RA "Polarization Properties and Unification Schemes." In: Phvsics of Active Galactic Nuclei (Springer, ed. Duschl & Wagner): 692-694, 1992.

SANBONMATSU, KY.; HELFAND, DJ. "A Distance Determination for the Supernova Remnant G27.4+0.0 and Its Central X-ray Source." Ai 104: 2189-2192,1992.

SASLAW, W.C "The Rate of Gravitational Galaxy Clustering." Api 221: 423-428,1992.

SCHMELZ, J.T.; HOLMAN, GJ).; BROSIUS, J.W.; GONZALEZ, RJD. "Coronal Magnetic Structures Observing Campaign, n. Magnetic and Plasma Properties of a Solar Active Region." Api 222: 733-742,1992. 48 SCHNEIDER, D.P.; VAN GORKOM, J.H.; SCHMIDT, ML; GUNN, J.E. "Radio Properties of Optically Selected High- Redshift Quasars. I. VLA Observations of 22 Quasars at 6 cm." Ai US: 1451-1456,1992.

SCHNEIDER, S.E.; THUAN, T.X.; MANGUM, J.G.; MILLER, J. "Northern Dwarf and Low Surface Brightness Galaxies, n. The Green Bank Neutral Hydrogen Survey." ApIS, 81: 5-33, 1992.

SCHULMAN, E.; FOMALONT, E.B. "The Distribution of Ionized Gas in the Sc-Galaxy NGC 1310." Ai lfl2: 1138-1145,1992.

SCHULTE-LADBECK, R.E.; NORDSIECK, KJL; CODE, AD.;ERSON, CM.; BABLER, BJ-.; BJORKMAN, K.S.; CLAYTON, G.C; MAGALHAES, AM.; MEADE, MJfc.; SHEPHERD, D.; TAYLOR, M.; WHITNEY, BA "The First Linear Polarization Spectra of Wolf-Rayet Stars in the Ultraviolet EZ Canis Majoris and 8 Muscae." Api 221: L37- U0,1992.

SIMONETTI, J.H. "Faraday Rotation Measure Irregularities Through the Supernova Remnant CTA 1: A Site of Enhanced Interstellar Plasma Turbulence." Api 286,170-180,1992.

SINGH, K.P.; WESTERGAARD, NJ. "Radio Structure of the Seyfert Galaxy Markarian 509." A&A, 264: 489-492, 1992.

SKINNER, S.L.; BROWN, A; UNSKY, J.L.; STEWART, R.T. "A High Sensitivity Survey of Radio Continuum Emission in Herbig Ae/Be Stars." In: Cool Stars. SteUar Systems, and the Sun 7 (ASP, ed. Giampapa & BookbinderV. 331-333, 1992.

SIADE, MA; BUTLER, BJ.; MUHLEMAN, D.O. "Mercury Radar Imaging: Evidence for Polar Ice." Sdeaes, 258: 635-640, 1992.

SLYSH, V.I.; KALENSKH, S.V.; VALTTS, LE. "The Detection of a New, Nonmasing Transition of Methanol at 283 GHz." ^pi 222: L43-L46, 1992.

SMITH, B J.; WALUN, J.F. "The Evolution History of the Interacting Galaxy System NGC 7714/7715 (Arp 284)" Apt 222: 544-558,1992.

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SNYDER, L.E.; HOLUS, J.M.; ZIURYS, LM.; KUAN, Y.-J. "Observations of HNO." IAU Symp,, 15Q: 187-188,1992.

SOPP, H.; ALEXANDER, P. "Colour-Selected IRAS Galaxies - A Comparative Investigation of Their Radio Properties." MtffiAS, 252: 425-432,1992.

SPARKS, W.B.; FRAIX-BURNET, D.; MACCHETTO, F.; OWEN, F.N. "A Counterjet in the Elliptical Galaxy M87." Nature. 355: 804-806,1992.

SPARKS, W.B.; MACCHETTO, F.; JACKSON, N J.; MILEY, G.K. "High Resolution Observations of 3C 66B." In: Testing the AGN Paradipm (AIP, ed. Holt et aL): 415-417,1992.

SRAMEK,R. "Radio Observations of NGC 4395, a Dwarf Seyfert Galaxy." In: Relationships Between Active Galactic Nuclei and Starburst Galaxies (ASP, ed. Filippeiiko): 273-276,1992.

SRAMEK, RA.; COWAN, J J.; ROBERTS, DA.; GOSS, W.M.; EKERS, R.D. "A VIA Search for Young Galactic Supernova Remnants." Ai 104: 704-718, 1992.

STECHER, T.P.; BAKER, G.R.; BARTOE, DJ).; BAUER, F.H.; BLUM, A; BOHUN, R.C; BUTCHER, ILR.; CHEN, P.C; COLUNS, N.R.; CORNETT, RJL; DEDLY, JJ.; GREASON, M.R.; HENNESSY, G.S.; HILL, J.K.; HILL, R.S.; HINTZEN, P.MJ*.; ISENSEE, J.E.; KENNY, PJ.; LANDSMAN, W.B.; UNARD, DJL; MARAN, SJP.; NEFF, S.G.; NICHOLS, G.R.; NOVELLO, J.; O'CONNELL, R.W.; OFFENBERG, JX).; PARISE, RA.; PFARR, B.B.; PLUMMER, TJB.; RICHARDSON, F.F.; ROBERTS, M.S.; STTKO, SJD.; SMITH, AM.; STOBER, AK.; STOLARDC, J.D.; TEBAY, J.C "The Ultraviolet Imaging Telescope: Design and Performance." Apt 225: L1-L4,1992.

STERN, RA; UCHIDA Y.; WALTER, F.; VILHU, O.; HANNAKAINEN, D.; BROWN, A; VEALE, A; HAISCH, B.M. "Coordinated Ginga, IUE, and VIA Observations of Stellar Activity in a2 Coronae Borealis." Api 221: 760-772, 1992.

STIAVELU, M.; BIRETTA J.; MOLLER, P.; ZEIUNGER, W.W. "Optical Counterpart of the East Radio Lobe of M87." Eafine, 255: 802-804, 1992. 50 STTNE, P.C "Radio and Infrared Emission from Markarian Starburst Galaxies." ApJS. 81: 49-58,1992.

STOCKE, J.T; MORRIS, S.L.; WEYMAN, RJ.; FOLTZ, CB. "The Radio Properties of the Broad-Absorption-Line QSOs." Api 226: 487-503,1992.

SUBRAHMANYAN, R. "330-MHz Radio Continuum Observations of the H n Regions M42 and M43." MNRAS. 254: 291-294,1992.

SUBRAHMANYAN, R. "Radio Jet in the H H Region Orion B." MHRAS, 254: 719-722, 1992.

TAN, J.; LEWIN, W.H.G.; HJELLMING, R.M.; PENNINX, W.; VAN PARADUS, J.; VAN DER KUS, M.; MTTSUDA K. "Simultaneous X-ray and Radio Observations of GX 5-1." Api 285: 314-319,1992.

TAYLOR, AR.; WALLACE, B J.; GOSS, W.M. "New Galactic Plane Supernova Remnants." Ai Iffii: 931-942,1992.

TAYLOR, G.B.; INOUE, M.; TABARA, H. "Anomalous Rotation Measures of the Compact Steep Spectrum Source 3C 318." A&A, 264: 421-427, 1992.

TAYLOR, G.B.; INOUE, M.; TABARA, H. "Anomalous Rotation Measures of the Radio Galaxy 3C 194." A&A, 264: 415-420, 1992.

TAYLOR, G.B.; PERLEY, RA "The Structure of the Hot Spots in 3C 295." A&A. 262: 417-423,1992.

TEREBEY, S.; VOGEL, SJN.; MYERS, P.C "Probing the Circumstellar Environments of Veiy Young Low-Mass Stars Using Water Masers." Api 220: 181-190,1992.

THOMPSON, AR. The Millimeter Array." IgEE Int Miq-owave Symp. Digest: 1247-1250, 1992.

THUAN, T.X.; PATTERSON, RJ.; CONDON, J J.; MITCHELL, KJ. "Blue Galaxies Identified with Submillijansky Radio Sources in the 1300+3034 Field." Ai 104: 1331-1338,1992.

TTFFT, W.G. "Properties of the Redshift. IV. Reference Data." ApIS, 22: 183-195,1992.

51 TORRELLES, J.M.; G6MEZ, J.F.; ANGLADA, G.; ESTALELLA, R.; MAUERSBERGER, R.; EIROA, C "The Powering Sources of the Molecular Outflows in the AFGL 437, AFGL 5142, and AFGL 5157 Regions." Api 222: 616-621, 1992.

TORRELLES, J.M.; G6MEZ, J.F.; CURIEL, S.; EIROA, C; RODRIGUEZ, L.F.; HO, P.TJP. "The Triple Radio Continuum Source in Serpens: Its Interaction with the Ambient Molecular Gas." Api 284: L59-L62,1992.

TORRELLES, J.M.; RODRIGUEZ, L.F.; CANTO, J.; ANGLADA, G.; GOMEZ, J.F.; CURIEL, S.; HO, P.TP. "On the Nature of the Excitation of the Herbig-Haro Object Z" Api 226: L95-L97, 1992.

TURNER, B.E. "Detection of Interstellar SO+: A Diagnostic of Dissociative Shock Chemistry." Api 226: L107-L110, 1992.

TURNER, B.E. "Detection of SiN in IRC +10216." Api 288: L35-L38,1992.

TURNER, B.E. "Interstellar Medium, Molecules." A&AEncv.. (Van Nostrand, ed. Maran): 378-381,1992.

TURNER, B.E. "What Molecules Remain to Be Seen?" In: rhenriistry and Spectroscopy of Interstellar Molecules. (U. Tokyo, ed. Bohme, et al.) 75-80,1992.

TURNER, B.E. "What Species Remain to Be Seen?" IAU Svmp.. J5Q: 181-186,1992.

TURNER, B.E.; CHAN, K.-W.; GREEN, S.; LUBOWICH, DA Tests of Shock Chemistry in IC 443G." Api 222: 114-133,1992.

TURNER, B.E.; XU, L.-P.; RICKARD, L. J. "On the Nature of the Molecular Cloud Cores in High-Latitude Cimis Clouds. II. Structure, Stability, and Physical Conditions from C180 Observations." Api 221,158-187,199Z

UCHIDA, KJ.; MORRIS, M.; BALLY, J.; POUND, M.; YUSEF-ZADEH, F. "A Dense Molecular Ring Surrounding the Nonthermal Galactic Center Radio Shell G359.1-0.5." Api 22S: 128-138,1992.

UCHIDA, K.; MORRIS, M.; YUSEF-ZADEH, F. "An HI Absorption Line Study of the Nonthermal Shell Near the Galactic Center, G359.1-0.5 and Several Nearby Unusual Radio Features." Ai 1M: 1533-1538,1992. 52 UNWIN, S.C; WEHRLE, AE. "Kinematics of the Parsec-Scale Relativistic Jet in 3C 345." Api 228: 74-86,1992.

VAN BREUGEL, WJ.M.; FANTI, C; FANTI, R.; STANGHELUNI, C; SCHIUZZI, R.T.; SPENCER, R.E. "Compact Steep-Spectrum 3CR Sources: VLA Observations at 1.5,15 and 225 GHz." A&A, 256: 56-78,1992.

VAN DRIEL, W.; AUGARDE, R.; BOTTINELU, L.; GOUGUENHEIM, L; HAMABE, M.; MAEHARA H.; BAAN, WA; GOUDFROOU, P.; GROENEWEGEN, MAT. "A Study of the NGC 7448 Group of Galaxies." A&A, 252: 71-96, 1992.

VAN DYK, S.D.; WEILER, KW.; SRAMEK, RA; PANAGIA, N. The 20 and 6 Centimeter Radio Ught Curves for SN 1981K: A Type U Radio Supernova." Api 226: 195-200, 1992.

VAN LANGEVELDE, HJ.; FRAIL, DA; CORDES, J.M.; DIAMOND, PJ. "Interstellar Scattering Towards the Galactic Center as Probed by OH/IR Stars." Apt 226: 686-695,1992.

VELUSAMY, T.; ROSHI, D.; VENUGOPAL, VJL "Multifrequency VIA Observations of the Crab Nebula at Different Epochs: Expansion and Radio Spectra of Filaments." MKRAS, 255: 210-216,1992.

VERSCHUUR, G.L.; RICKARD, L. J; VERTER, F.; POUND, M.W.; LEISAWITZ, D. The Separation between Gas and Dust Filaments at the Edge of the Expanding Shell in Eridanus." Api 220: 514-535,1992.

VISNOVSKY, K.L.; IMPEY, CD.; FOLTZ, CB.; HEWETT, P.C; WEYMANN, RJ.; MORRIS, SX. "Radio Properties of Optically-Selected Quasars." Api 221: 560-568,199Z

WAGNER, S J.; HEIDT, J.; WTTZEL, A; WAGNER, R.; QUIRRENBACH, A "Radio- and Optical VariabiUty in 0716+714." In: Physics of Active Galactic Nuclei (Springer, ed. Duschl & Wagner): 598-599,1992.

WAGNER, S J.; WTTZEL, A "Intraday Variability of Active Galactic Nuclei Radio and Optical Observations." In: Extragalactic Radio Sources - Frnm Beams tn Jets (Cambridge, ed. Roland et aL): 59-70, 1992.

WARDLE, M.; YUSEF-ZADEH, F. "Origin of the Hot Gas and Radio Blobs at the Galactic Centre." Nature. 252: 308-310,1992.

53 WEGNER, R.; WTTZEL, A; QUIRRENBACH, A; KRICHBAUM, T.P.; SCHAUNSKI, CJ. "Intraday VariabiUty of Compact Radio Sources." In: Physics of Active Galactic Nuclei (Springer, ed. Duschl & Wagner): 600-602,1992.

WEHRLE, AE.; COHEN, M.H.; UNWIN, S.C; ALLER, H.D.; ALLER, M.F.; NICOLSON, G. The MiUiarcsecond Structure of Highly Variable Radio Sources." Api 221: 589-607,1992.

WEILER, KW.; VAN DYK, S.D.; PANAGIA, N.; SRAMEK, RA "FuU Evolution of the 6 and 20 Centimeter Radio Emission from SN 1980K." Api 228: 248-253, 1992.

WELLS, D.C. "Open ChaUenges." In: Astronomy from Large Databases 2 (ESO, ed. Heck & Murtagh): 143-148, 1992.

WHITE, S.M.; KUNDU, M.R.; BASTIAN, T.S.; GARY, D.E.; HURFORD, GJ.; KUCERA, T; BIEGING, J.H. "Multifrequency Observations of a Remarkable Solar Radio Burst" ApJr 384: 656-664,199Z

WHITE, S.M.; KUNDU, M.R.; GOPALSWAMY, N. "High Dynamic Range Multifrequency Radio Observations of a Solar Active Region." ApIS, 28: 599-617,1992.

WHITE, S.M.; PAUAVICINI, R.; KUNDU, M.R. "A 5 GHz Radio Survey of Selected Post T Tauri and Naked T Tauri Stars." A&A, 252: 557-566,1992.

WHITE, S.M.; PAUAVICINI, R.; KUNDU, M.R. "Radio Flares and Magnetic Fields on Weak-Line T Tauri Stars." A&A, 252: 149-154,1992.

WIERINGA M.H.; KATGERT, P. "Optical Identifications of Faint Ultra-Steep Spectrum Radio Sources." A&AS. 93: 399418,1992.

WILUAMS, P.M.; VAN DER HUCHT, KA; BOUCHET, P.; SPOELSTRA, TATH.; EENENS, P.RJ.; GEBALLE, T.R.; KIDGER, M.R.; CHURCHWELL, E. "Condensation of Dust Around the Wolf-Rayet Star WR 125." MNRAS. 258: 461-472,1992.

WILLS, BJ.; WILLS, D.; BREGER, M.; ANTONUCO, R.RJ.; BARVAINIS, R. "A Survey for High Optical Polarization in Quasars with Core-Dominant Radio Structure: Is There a Beamed Optical Continuum?" ApJr 398: 454-475,1992. 54 WILLSON, R.F.; ASCHWANDEN, MJ.; BENZ, AO. "VIA, PHOENIX and BATSE Observations of an XI Flare." In: Compton Obseivatorv Science Workshop (NASA CP 3137, ed. Shrader et aL): 515-521,1992.

WILSON, CD. "CO Emission from the Dwarf Irregular Galaxy NGC 6822." Api 221: 144-151,1992.

WILSON, CD.; SCOVILLE, N. The Molecular IntersteUar Medium in Two Giant H H Regions in M33: NGC 604 and NGC 595." Api 285: 512-521,1992.

WITT, AN.; PETERSOHN, J.K.; BOHLIN, R.C.; O'CONNELL, R.W.; ROBERTS, M.S.; SMITH, AM.; STECHER, T.P. "Ultraviolet Imaging Telescope Images of the Reflection Nebula NGC 7023: Derivation of Ultraviolet Scattering Properties of Dust Grains." ApJ. 225: L5-L8, 1992.

WTTZEL, A "Observations of Compact Active Galactic Nuclei - High Frequency VLBI and Intraday VariabUity." In: Physics of Active Galactic Nuclei (Springer, ed. Duschl & Wagner): 484-501,1992.

WOLSZCZAN, A; FRAIL, D. "A Planetary System Around the Millisecond Pulsar PSR1257+12." MatUIS,255: 145-147,1992.

WOMACK, M.; ZIURYS, L.M.; WYCKOFF, S. "Estimates of N2 Abundances in Dense Molecular Clouds." Api 222: 188-192,1992.

WOMACK, M.; ZIURYS, L.M.; WYCKOFF, S. "A Survey of NiH"1" in Dense Clouds: ImpUcations for IntersteUar Nitrogen and Ion-Molecule Chemistiy." Api 282: 417-429,1992.

WOOTTEN, A; WLODARCZAK, G.; MANGUM, J.G.; COMBES, R; ENCRENAZ, PJ.; GERIN, M. "Search for Acetic Acid in IntersteUar Clouds." A&A, 252: 740-744, 1992.

WROBEL, J.M.; KENNEY, J.D.P. "Nuclear Molecular Gas in the Virgo Ouster SO Galaxy NGC 4710." Api 222: 94-99, 1992.

XIANG, D.; TURNER, B.E. Ten New H20 Masers Discovered in Star-Forming Regions." rhinftse A&A, 16, 307-314, 1992. (Chinese version published in Acta Astron. Sinica. 22: 87-94,1992.)

55 YUSEF-ZADEH, F.; MEUA, F. The Bow Shock Structure of IRS 7: Wind-Wind Collision Near the Galactic Center." Api 285: U1-U4, 1992.

ZHAO, J.-H.; BURNS, J.O.; HARDEE, P.E.; NORMAN, M.L. "InstabiUties in Astrophysical Jets. L Linear Analysis of Body and Surface Waves." Apt 282: 69-82,199Z

ZHAO, J.-H.; BURNS, J.O.; NORMAN, M.L.; SULKANEN, M.E. "InstabiUties in Astrophysical Jets. H. Numerical Simulations of Slab Jets." Api 282: 83-94,1992.

ZHAO, J.-H.; GOSS, W.M.; LO, K.Y.; EKERS, RJD. "Evidence for Intrinsic Activity of Sgr A* at the Galactic Center." In: Relationships Between Active Galactic Nuclei and Starburst Galaxies (ASP, ed. Filippenko): 295-299,1992.

ZHAO, J.-H.; ROBERTS, DA; GOSS, W.M.; FRAIL* DA; LO, K.Y; SUBRAHMANYAN, R.; KESTEVEN, MJ.; EKERS, R.D.; ALLEN, DA; BURTON, M.G.; SPYROMIUO, J. "A Transient Radio Source Near the Center of the Milky Way Galaxy." Science. 255: 1538-1543,1992.

ZIURYS, L.M. "Observational Studies of SiUcon and Metal Chemistiy in Dense Clouds." In: CheTnistry and Spectroscopy of IntersteUar Molecules (U. Tokyo, ed. Bohme et aL): 29-34,1992.

ZIURYS, L.M.; APPONI, AJ.; YODER, J.T. "Detection of the Quadropole Hyperfine Structure in HCNH+." Apt 222: L123-L126, 1992.

ZLOBEC, P.; MESSEROTTI, M.; DULK, GA; KUOBRA, T. "VIA and Trieste Observations of T^pe I Storms, Type IV and Pulsations." Solar Phvs.. J41: 165-180,1992.

ZYLKA R.; GUSTEN, R.; HENKEL, C; BATRLA, W. "HjCO Survey in the Galactic Center (fiS * 1 * 490." A&AS, 26: 525-547,1992.

56 ADDITIONS TO THE 1991 PUBLICATIONS LIST

ANDRE, P. "A 13-mm Survey for Cold CircumsteUar Dust in p Ophiuchi" Mem. Soc. Astron. ItaL. (& 829-839,1991. BROWN, R.L. "Orbiting Sub-Millimeter Interferometer Concepts." In: Workshop Proceedings: Science Objectives and Architectures for Sub-imllimeter Interferometrv in Space. Ed. D. Jones and C Masson. (Pasadena: Jet Propulsion Laboratory, 1991) 71-79. DADDARIO, L.R. "Possible NRAO Contributions to VSOP." In: Frontiers of VLBI. Ed. H. Hirabayashi, M. Inoue, and H. Kobayashi. (Tokyo: Universal Academy Press, 1991) 129-130. GRIFFITH, M.; WRIGHT, AE.; HUNT, AJ.; TROUP, E.; EKERS, R.D.; BUCKETT, P.; COOKE, DJ.; FREEMAN, G.; GLOWACKI, J.; JENNINGS, D.; KNOP, U.; LAM, B.; MCGOVERN, L; MCCONNELL, D.; NORRIS, R.P.; OTRUPCEK, R.; TWARDY, R.; WILLIAMS, T; BEHRENS, G.; CHESTNUT, C; BURKE, B.F.; FLETCHER, A; RUSSELL, K.S.; SAVAGE, A; UM, J.; VAUGHAN, AE.; COTE, S.; ANDERSON, M.; HONS, A; WHITE, G.L; AMY, STBURGESS, A; CHAN, S.; CRAM, L.; GRAY, A; WALSH, W.; CAMPBELL-WBLSON, D.; MONTYRE, V.; RANDALL, P.; SUTERS, M.; ZEALEY, WJ. The Parkes-MTT-NRAO Southern Sky Survey at 4850 MHz." EASA,2, 243-245, 1991. GUHATHAKURTA P. "A VIA HI Survey of the Perseus-Pisces Region: Stuping Low-Luminosity Dwarf Galaxies." In: Physical Cosmology. Ed. A Blanchard, et al. (Gif sur Yvette: Editions Frontieres, 1991) 598-599. HJELLMING, R.M.; PENNINX, W. "Radio Emission and Particle Acceleration in Compact Accreting Objects." In: Particle Acceleration Near Accreting Compact Objects. Ed. J. van Paradijs, M. van der Klis, and A Achterberg. (Amsterdam: North-HoUand, 1991) 109-128. ROMNEY,J.D. "CompatibiUty Considerations for VLBA Support of VSOP." In: Frontiers of VLBI. Ed. H. Hirabayashi, M. Inoue, and H. KobayashL (Tokyo: Universal Academy Press, 1991) 125-127. ROMNEY,J.D. "Millimeter-VLBICapabiUtiesoftheVLBA" In: Frontiers of VLBI. Ed. H. Hirabayashi, M. Inoue, and H. Kobayashi. (Tokyo: Universal Academy Press, 1991) 261-263. SAIKIA, DJ.; SALTER, CJ.; BANHATIT, D.G.; GHOSH, T.; GOTHOSKAR, P.; MANOHARAN, P.K. The Ooty Summer Training Program 1990." Bull. Astron. Soc. India. 12,109-122,1991.

57 STAVELEY-SMTTH, L.; WALSH, W.M.; BLAND-HAWTHORN, J.; AXON, D J.; DAVIES, R.D.; SMOKER, J. "Gaseous Discs, StabiUty and the Cosmic Distance Scale." In: Dynamics of Disc Galaxies. Ed. B. SundeUus. (Goteborg: Goteborg University, 1991) 395-399. ULVESTAD, J.S. Thasing the Very Large Array on GaUleo in the Presence of Jupiter's Strong Radio Emission." TDA Progress Report. 42-105. 69-79, 1991. WAGNER, S J. "Rapid VariabUity of BL Lac Objects in the Optical Regime." In: VariabiUty of Active Galaxies. Ed. W. J. Duschl, S. J. Wagner, and M. Camenzind. (Berlin: Springer-Verlag, 1991). 163-173.

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