NATIONAL RADIO S U M M A R Y ASTRONOMY OBSERVATORY

1995 STATISTICS Front of card: VLBA image of the radio jet at the center of the galaxy 3C120. Even at the great distance of this galaxy, 400 million light years from the Earth, the great resolving power of the VLBA makes it possible to image details as small as 1.5 light-years in size within the jet structure which is itself 100 light-years long. "Time-lapse" images made over several years show the jet to be moving outward at an apparent speed faster than the speed of light. Observers: R.C. Walker and J.M. Benson NATIONAL RADIO ASTRONOMY OBSERVATORY

Observing Summary 1995 Statistics

February 1996 SOME HIGHLIGHTS OF THE 1995 RESEARCH PROGRAM

A second Superlmninal Source in the Milky Way has been tracked by the VLBA/VLA combination. The X-ray nova GRO J1655-40, tracked as a target of opportunity during a radio outburst, has been found to exhibit superlmninal motion in radio jets. The two highly collimated relativistic jets, one on each side of the source, expand and decay over a few days. The jet ejection, at 92 percent the speed of light, appears episodic and asymmetric; the alternate brightening and fading of the jets cannot be explained by relativistic beaming. The jets exhibit "wiggles" with a period of about three days. Optical observers have discovered that the system is an eclipsing spectroscopic binary, with an orbital period of 2.62 days for the secondary, within the uncertainty of the 3-day period seen in the radio-jet *star. These results thus confirm the suspicion that the primary is a black hole. The fortuitous wealth of known parameters also makes this system, at a distance of only 3.2 kpc, the best known system for studying relativistic jets from accretion disks.

A northem-sky survey on the 140 Foot Telescope for millisecond pulsars has resulted in the detection of a pulsar in a binary system (Jl 518+4904). The pulsar has a period of 41 ms and is in an eccentric 8.6 day orbit around its companion, probably a second neutron star. Because neutron stars can be treated as point masses, tight double-neutron-star binaries such as this provide unique laboratories for measuring phenomena of relativistic gravity. Measures of the relativistic precession of the J1518+4904 orbit (0.011 deg/yr) indicate that the summed mass of the pulsar and its companion is 2.62 ± 0.7 solar masses. While the distribution of mass between the pulsar and its companion cannot be determined unambiguously, dynamical considerations place a firm upper limit of 1.8 solar masses on the pulsar mass and constrain the companion mass to be between 0.9 and 2.7 solar masses. Both neutron stars appear to have masses near the Chandrasekhar mass of 1.35 solar masses. This system is only the fifth known relativistic binary system.

VLBA images of HjO and SiO masers in the envelopes of evolved M-type giant stars have been made over four epochs covering a three-year period. The SiO masers lie in well-defined thin rings at 2-4 stellar radii from the stars and persist over the three years but vary in size and shape. In TX Cam the rings vary from 28 mas to 42 mas in diameter, with some evidence for two minima, suggesting that the environment close to this pulsating star changes dramatically at different points through its 557-day cycle. The most recent epoch was observed in full polarization mode and shows the presence of highly ordered linearly polarized structure in the maser rings. H20 masers observed around five M-type giant and supergiant stars he systemmatically outside the SiO masers, in accordance with astrochemical predictions. The H2O masers move away from the central star in the expected manner, and the transverse velocities are about as expected from the outflow velocity measured with single dishes, allowing distances to be determined by the cluster-parallax method to within ten percent accuracy. MgCN, a new metal-bearing free radical, has been identified in the circumstellar envelope of the evolved carbon star IRC 10216. The NRAO 12 Meter Telescope and the ERAM 30-m telescope were used. Metals such as magnesium, iron, and sodium must form in supemovae and massive stars, and are known to be abundant in elemental form but not in molecular form in the interstellar gas. The mechanism by which metals leave stars, enter the interstellar medium, and eventually reappear in new stars is poorly understood. It is likely that most of the metals are condensed onto dust grains. The emission from MgCN appears to arise from the outer envelope of IRC 10216, suggesting that MgCN (or Mg) probably enters the interstellar medium in the gas phase. MgCN is the metastable isomer of the earlier-detected species MgNC. An abundance ratio [MgNC]/[MgCN] of 22 is determined. The relatively high abundance of MgCN implies that it is formed by non-equilibrium chemistry.

A sequence of VLBI images has revealed expansion of the supernova SN1993J in M81. Using the VLA, the VLBA, and European telescopes, an international VLBI team has made a high-resolution sequence of images that shows the expansion over a one-year period. While the expansion is symmetrical, the radio emission is clearly stronger on one side of the shell. So far, no protrusions such as those seen resulting from instabilities in older supernova events have developed. The images also show that the debris shell has not begun decelerating due to interaction with circumstellar material. The angular expansion rate measured with the VLBI images, combined with expansion speed measured by optical spectroscopy, will provide a refined value for the distance to M81, about 11 million light-years away.

Observation with the 140 Foot Telescope of OH emission and absorption spectra toward a sample of compact extragalactic continuum sources show that there are some OH emission features which have no counterpart in either OH absorption or in the spectra of other molecules like CO, HCO+, and HCN. The OH emission lines, however, match the deepest HI absorption components. This implies that interstellar OH must be widespread and must exist in clouds that are mainly atomic and have little H2 or other molecular species.

Observations have revealed a collapsing envelope around a protostar. The VLA and the DSN 70-meter telescope were used to make 22 GHz spectral line maps of the molecule CCS toward the core of B335, a young protostellar region. The resulting high-resolution channel maps image the collapsing envelope around the protostar. The velocity structure supports the evidence for inside-out collapse and the high-velocity features are consistent with accretion onto a rotating central disk. The CCS emission is asymmetric and clumpy, implying that the physical conditions of the region are not spherically symmetric and that the infall of gas onto the circumstellar disk may be episodic. OBSERVING HOURS

est. est. est. 30

o 20

O

1983 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 Calendar Year

140 Foot Y7A 12 Meter ^ VIA I I VISA

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

12 Meter 140 Foot VLA VLBA

o 1—I

3 o mm m illw 1986 87 88 89 90 91 92 93 94 95 1986 87 88 89 90 91 92 93 94 95 1986 87 88 89 90 91 92 93 94 95 1993 94 95 Calendar Year Calendar Year Calendar Year Calendar Year

NRAO Staff E55I Visitors 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. 12 METER RADIO TELESCOPE SUMMARY

100 - A - ^ * j i > \ •\ 80 A r N ■v r S rf 1 A 4 A \ i / 1 t f / r - / g 60 \ A 1 \ A \ A / \ A \ h / 1 h / A ; \ A \ A / \ A / - [ & 40 V - V V \ V \ 20 i V \ V \ s. V \ u L V V V 0 1986 1987 1988 1989 1990 1991 1992 1993 1994 1995 Calendar Year

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

Fig. 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 140 FOOT RADIO TELESCOPE SUMMARY

100 - -> /* ■> V 'V ^ ^ ^ ^ ^ 80 w __i :\...^ * ^V- !^ ^ ^5 S* ^ f - C - V - 3 60 - - £ 40 A - A - -o ^v >- A. •s 20 y \ ^^ X r \ V V * ^ a £t B ► < ■ ■»■ ^ •^ .- i ,-«« -^ > ^.— 3<; .^ ^^ ■ ■■ .-, .-••*"

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 include holographic surface tests and panel readjustments in 1987. VERY LARGE ARRAY TELESCOPE SUMMARY

100 - 80 *■ *> /S ,,,l "> *> •A ^ * ■■■ ** "^ - "^ ^ — ^ V ^ V. ^ / ^ " " S 60 *> - - ft* 40 ^N "S ^ ^^ «M ^^ «^ / s^ *N ^^ _ **s 20 ^ v* .% »^ i^ ■»< .*« ■ ^ ,•* • • », »*. .», .— .«, «* ■ ■ >M I .. .-«»• i^ ■•■ • "■i ... >^ •«•, ^ .*• • ■» ■ ■ "^^ ■■#' »•« ■ Ml ■ a^ »■• .^'^ ■ • 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, maintenence, and calibration; and the percentage of time lost due to hardware or software failure, power failure, or bad weather. VERY LONG BASELINE ARRAY TELESCOPE SUMMARY

100 - - 80 - - ~ 60 o - ^ ^ *• £ 40 t \ *£ > ^ - r /- ^ — V > 20 I - - 0 tmm, ■ ■

Calendar Year

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

Fig. 6. This summary for each quarter of the calendar year shows the percentage of time the telescope was schedued 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. FULL-TIME EMPLOYEES

est. est.

I

i 1982 1983 1984 1985 1986 1987 1988 1989 1990 1991 1992 1993 1994 1995 1996 1997 Calendar Year ^Hj Research and Operations B£§&3 VLBA Construction \\\\\\\\ GBT Construction

Fig. 7. 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

£

1981 1982 1983 1984 1985 1986 1987 1988 1989 1990 1991 1992 1993 1994 1995 1996 Calendar Year Fig. 8. This bar chart shows for each calendar year the number of NRAO research staff and the number of NRAO postdoctorals (Jansky Postdoctorals) 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 VLA.

10 DISTRIBUTION OF SCHEDULED OBSERVING PROGRAMS

IN VARIOUS RESEARCH AREAS, BY PERCENT

12 Meter 140 Foot VLA VLBA Overall I. SOLAR SYSTEM—

Sun, Planet, Satellites, and Comets 6% 4% 6% 3% 5% n. STELLAR —

Pulsars, X-ray Sources, Planetary Nebulae, 4% 28% 26% 20% 22% Circumstellar Shells, Supernova Remnants, Masers, Novae, Supemovae, and Stars m. GATACTIC — Galactic Structure, Center, Molecular Clouds, HE Regions, 56% 43% 24% 15% 28% Star Formation, Molecules, and Interstellar Medium

IV. EXTRAGALACTIC —

11 DISTRIBUTION OF TELESCOPE TIME BY PERCENT

12 Meter 140 Foot VLA VLBA 1995 Summary Visitors 46% 44% 47% 28% 41% Students 13% 13% 8% 5% 10% NRAO Staff 12% 15% 18% 9% 14% Postdoctorals (Jansky Fellows) 1% 8% 2% 1% 3% Test and Calibration 26% 8% 13% 17% 16% Maintenance and Installation 1% 10% 11% 15% 9%

12 INSTITUTIONS FROM WHICH VISITORS CAME TO USE NRAO TELESCOPES DURING 1995

INSTITUTE 140 Foot 12 Meter VLA VLBA

1. Air & Space Museum (DC) X x 2. Alabama, University of (AL) x 3. Amsterdam, University of - Astronomy Institute x 4. Applied Research Corporation x 5. Arcetri Astrophysical Observatory (Italy) X

6. Arizona, University of- Steward, L&P Lab, SMTO x x X 7. Arizona State University (AZ) x X 8. Astro Cosmic Center (Moscow) x 9. Astrophysical Institute, Potsdam (Germany) X 10. Athens, University of (Greece) X

11. Barcelona, University of (Spain) X 12. Beijing Astronomical Observatory (China) x x 13. Bell Laboratories (NJ) x 14. Birmingham, University of (UK) x 15. Bochum, University of (Germany) x

16. Bologna, University of (Italy) x 17. Bonn University (Germany) x 18. Bordeaux Observatory (France) x x x 19. Boston University (MA) x x XX 20. Brandeis University (MA) x X X

13 INSTITUTE 140 Foot 12 Meter VLA VLBA

21. Brera Osservatorio (Italy) x 22. Bristol - Cantock Close (UK) x 23. Budapest, University of (Hungary) x 24. Calgary, University of (Canada) x x 25. California, University of, Davis x

26. California, University of, Berkeley - Hat Creek x x x x 27. California, University of, Los Angeles x x x 28. California, University of. Riverside - IGPP x 29. California, University of, San Diego x 30. California, University of, Santa Barbara x x

31. Caltech - OVRO, Palomar, Big Bear Solar Obs. (CA) x x x x 32. Cambridge Univ. - Cavendish, Mullard, IOA (UK) x x 33. Canadian Military College x 34. Catalina Foothills High School (AZ) x 35. Catania University (Italy) x

36. CFA - Harvard, Smithsonian Astrophys. Obs. (MA) x x x x 37. CNR, IRA, Noto, Frascati (Italy) x 38. CNRS, France (CEN, Saclay) x 39. Chalmers - Onsala Space Observatory (Sweden) x x x x 40. Chicago, University of- Yerkes Observatory (IL) x

14 INSTITUTE 140 Foot 12 Meter VLA VLBA

41. Chile, University of (Chile) x 42. Chungnam National University (Korea) x 43. Colgate University (NY) x 44. Cologne, University of (Germany) x 45. Colorado, University of-JILA,LASP (CO) x x x

46. Columbia University (NY) x 47. Cornell University (NY) x x x 48. CSIRO-ATNU,ParkesObs. (Australia) x x x 49. CTIO - Cerro Tololo International Obs. (Chile) x 50. DRAO - Dominion Radio Astrophysical Obs. (Canada) x

51. DTM/Camegie Inst. (DC) - Las Campanas (Chile) x x 52. Edinburgh, University of (Scotland) x 53. ESA - European Space Agency (Spain) x 54. ESO - European Southern Obs. (Chile; Germany) x x 55. ESTEC/ESA/ExOSAT (Netherlands) x

56. Florence, University of (Italy) x 57. Florida, University of (FL) x 58. Franklin High School (WV) x 59. Genova University (Italy) x 60. Georgia, University of (GA) x x

15 INSTITUTE 140 Foot 12 Meter VLA VLBA

61. George Mason University (VA) x x 62. Gray Data Consultants (Chicago, IL) x 63. Grenoble, Univ/Observatory (France) x 64. Groningen, University of-Kapteyn (Netherlands) x x x 65. Hamburger Stemwarte (Germany) x

66. Hanscom Air Force Base - AFGL (MA) x 67. Hartebeesthoek Radio Astronomy Obs. (S. Africa) x 68. Haverford College (PA) x 69. Hawaii, University of-IOA (HI) x x 70. Haystack Observatory - NEROC (MA) x x x

71. Helsinki, Univ. of - METSAHOVI, HUT (Finland) x 72. Heidelberg Observatory (Germany) x x 73. IBM - J.T. Watson Research Center (NY) x 74. IAFE - Buenos Aires (Argentina) x x x 75. Illinois, University of-Vermillion River Obs. x x x

76. Indian Institute of Astrophysics (India) x 77. Institute of Astrophysics (Granada) x 78. Institute of Astrophysics (Paris) x x 79. Institute for A & A (Andalucia) x x x 80. Institute for Space Research (Moscow) x

16 INSTITUTE 140 Foot 12 Meter VLA VLBA

81. Interferometrics, Inc. - NVI x x x 82. Inst, of Space & Aeronautical Sciences (Japan) x x 83. Iowa, University of (LA) x x 84. Iowa State University (IA) x 85. IP AC - Infrared Processing/Analysis Center (CA) x x x

86. IRAM (France, Spain) x x x x 87. Jagellonian University (Poland) x 88. Jena Universitat (Germany) x 89. Johns Hopkins University (MD) x 90. JPL - Goldstone (CA) x x

91. Kentucky, University of (KY) x 92. KPNO/NOAO-National Optical Astronomy Obs. (AZ) x x x 93. Lancashire, University of Central (UK) x x 94. Lawrence Livermore National Laboratory (CA) x x 95. Lebedev Physics Institute - ASC (Russia) x x x

96. Leiden, University of-Huygens Lab (Netherlands) x x x 97. Liverpool Johns Moores University (UK) x x 98. Lisbon, University of (Portugal) x x 99. Lockheed Research Laboratory (CA) x 100. Los Alamos Scientific Laboratory (NM) x

17 INSTITUTE 140 Foot 12 Meter VLA VLBA

101. Louisiana State University (LA) x 102. Lowell Observatory (AZ) x 103. Madrid Observatory (Spain) x 104. Manchester, University of-Jodrell,NRAL (UK) x x 105. Marseille Observatory (France) x

106. Maryland, University of-Clark Lake Obs. (CA) x x x x 107. Massachusetts, University of- FCRAO (MA) x x x x 108. Meudon Observatory (France) x x x 109. Mexico, University of-Inst, of Astronomy (UNAM) x x x 110. Michigan State University (MI) x

111. Michigan, University of (MI) x x x 112. Middlebury College (VT) x 113. Minnesota, University of (MN) x x 114. Missouri, University of (MO) x 115. Mizusawa Observatory (Japan) x

116. MIT - Lincoln Laboratories (MA) x x x 117. Moscow State U. - Sternberg State AI (Russia) x 118. MPIAP (Munich, Germany) x 119. MPIR (Bonn, Germany) x x x 120. MPIflEP, Garching (Germany) x x

18 INSTITUTE 140 Foot 12 Meter VLA VLBA

121. Mt. Stromlo Observatory -ANU (Australia) x x 122. NAIC - Arecibo Observatory (NY, PR) x x x 123. National Astronomical Observatory (Japan) x x 124. Nanjing Univ/Observatory (China) x 125. Nanjing, University of (China) x

126. NASA/Ames Research Center (CA) x x 127. NASA/Goddard Space Flight Center (MD) x x x x 128. NBS - National Bureau of Standards (DC) x 129. National Centre for Radio Astrophysics (India) x x 130. New Hampshire, University of (NH) x

131. Nevada, University of (Las Vegas) x x 132. NFRA - JIVE, Dwingeloo; Zwiggelte; Westerbork x x 133. NMIMT-New Mexico Inst, of Mining Technology x 134. New Mexico, University of (NM) x x x 135. New Mexico State University (NM) x

136. Nobeyama Observatory (Japan) x x 137. North Carolina, University of (NC) x 138. North Carolina State University (NC) x 139. Northwestern University (IL) x x 140. NRC Herzberg - Algonquin Obs. (Canada) x x

19 INSTITUTE 140 Foot 12 Meter VLA VLBA

141. NRL-Naval Research Laboratory (DC) x 142. Oberlin College (OH) x 143. Ohio State University (OH) X 144. Oklahoma, University of (OK) X 145. Oregon, University of (OR)

146. Ottawa, University of (Canada) 147. Oxford University (UK) 148. Paris Observatory (France) 149. Perm State University (PA) 150. Pomona College (CA)

151. Princeton Univ. - Inst. Advanced Studies (NJ) x x 152. Puerto Rico University (PR) x 153. Pulkova Observatory (Russia) x 154. Queen Mary College (UK) 155. Queens University (Canada) X

156. Raman Research Institute (India) 157. Rensselaer Polytechnic Institute (NY) 158. Rhodes College (Memphis, TN) 159. Rochester, University of (NY) 160. Royal Greenwich Observatory (UK)

20 INSTITUTE 140 Foot 12 Meter VLA VLBA

161. Royal Observatory-UKIRT,JCMT (Scotland) x 162. Rutgers University (NJ) x 163. Seoul National University (Korea) x 164. Sheffield, University of (UK) x 165. Sinica Academia, IAA (Taiwan) x x

166. Southampton, University of (UK) x 167. Southwest Research Institute (TX) x 168. Space Telescope Science Institute (MD) x x x 169. Special Astrophysical Observatory (Russia) x 170. St. Lawrence University (NY) x

171. St. Mary's University (Canada) x 172. SUNY (allcampi) x x x 173. SFIT,ETH-Swiss Federal Institute of Technology x x 174. Tasmania, University of (Australia) x x 175. Tel-Aviv University - Wise Obs. (Israel) x

176. Texas, University of-McDonald Observatory (Tx) x x 177. Tianjing University (PRC) x 178. Torino University (Italy) x 179. Toronto, Univ. of - David Dunlap Obs. (Canada) x x x 180. Toulouse Observatory (France) x

21 INSTITUTE 140 Foot 12 Meter VLA VLBA

181. Trinity College (Tx) 182. Tufts University (MA) 183. Turku, University of-Tuorla Obs. (Finland) 184. Union College (NY) 185. Universidad Federal de Santa Maria (Brazil)

186. University College Cardiff (UK) 187. University College London (UK) 188. USNO - United States Naval Observatory (DC) 189. Utrecht, University of (Netherlands) 190. Valencia, University of (Spain)

191. Vassar College (NY) 192. Villanova University (PA) 193. Virginia, University of (VA) x 194. Virginia Polytechnic Institute & State U. (VA) 195. Washington State University (WA)

196. Washington, University of (WA) 197. Wellesley College (MA) 198. Wesleyan University (CT) 199. Western Australia, University of (Australia) 200. Wisconsin, University of-Washburn Obs. (WI)

22 INSTITUTE 140 Foot 12 Meter VLA VLBA

201. Yebes Observatory - Centro Astro de Yebes (Spain) x 202. York University (Canada) x

Number of Institutions 34 69 166 76

Number of Visitors 64 136 515 225 Number of Students 17 33 110 40 Number of Research Associates 6 4 13 2 Number of Permanent Staff

Total Observers 98 186 668 291

All told, 923 visitors, including 176 students from 202 instiutions.

23 NRAO STUDENT PROGRAM 220

1981 1982 1983 1984 1985 1986 1987 1988 1989 1990 1991 1992 1993 1994 1995 1996 Calendar Year Fig. 9. 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 majority of the undergraduate summer students were funded by a separate NSF Grant for Research Experience for Undergraduates.

24 NRAO FRONT-END STATUS 140 FOOT TELESCOPE FEBRUARY 1996 TECHNICAL DATA SHEET NO. 12 PAGE 1 OF 5

SYSTEM 3 dB PERSON(S) CALIBRATION SWITCHING RECEIVER FREQUENCY AMPLIFIER TEMPERATURE BANDWIDTH 1-fc.tD TYPE POLARIZATION REMARKS IN VALUE SYSTEM NAME (GHz) TYPE (KELVIN) (MHz) CHARGE

DICKE SWTCH: RfcJ-tRENCE OPEN TEMPERATURE HIGH ORTHOGONAL 60-88 38 SLEEVE UNEAR ADWSTABLE MHz DYNAMIC CROSSED FROM RANGE 300 2B. FEED CHANCES FROM 50-88 MHz TO + DIPOLE REMOVABLF 100 TO 100.000K 110-240 MHz OR TO 450-500 MHz TRANSISTOR NORROO DUAL Ttky QUAD HYBRID ADJUSTABLE REQUIRE TWO HOURS. 50-600 MHz AT hUd) FOR OR CHANNa 2 TO 2500K (OU>*R) Rx BROADBAND RCP AND LCP FREQUENCY 110-240 CROSSED 130 SWITCH MHz DIPOLE

CAVITY RCP 450-600 FET BACKED FREQUENCY 450-500 MHz AMP IN 50-250 MHz Rx 60-80 60 AND SWITCH MHz AMP CROSSED LCP DIPOLE

300-350 280-350 MHz COOLED 70 350-410 OASFET AMP 60-100 CAVITY DUAL BACKED 360-410 CHANNa 60 CROSSED MHz DIPOLES ONE OF THE FIVE FEEDS 500-750 DUAL COOLED SCALAR 280-350 MHz ORTHOGONAL 600-760 OASFET AMP 60-70 80 WITH 350-410 MHz NORROO MHz DUAL UNEAR 500-750 MHz CROSSED FREQUENCY 300-1000 CHANNa DIPOLES 5K 750-850 MHz OR (SHANK) MHz Rx SWITCHING 750-1000 MHz 750-850 RF HYBRID CAN BE USED. TO CHANGE FEEDS REQUIRES COOLED CAVITY FOR RCP TWO HOURS. 750-960 HFET 45-50 80 OR AND LCP MHz DUAL 760-1000 CHANNa SCALER 760-1000 COOLED SCALAR 750-1000 GASJ-L1 AMP CHANCE BETWEEN 750-950 HH.IS AND 50-70 60 WITH 760-1000 FETS REQUIRES 5 DAYS MHz DUAL CROSSED CHANNa DIPOLES FREQUENCY COOLED SINGLE 1.00-1.45 CASFET ORTHOGONAL 4K TO 6K SVflTCHINC 35-40 450 BEAM UNEAR (25 CM) DUAL SCALAR CHANNa NOISE ADDING NORROO 6/25 CM ORTH CIRCULAR OTHER FLED CHANGE REQUIRED TO SWITCH BANDS SINGLE BEAM 1.4K Rx COOLED OR ORTH UNEAR POLARIZATION TAKES TWO HOURS. (SHANK) 4.47-6.05 OASFET 50-80 580 OR (6 CM) DUAL CHANNa 12. ex

25 NRAO FRONT-END STATUS 140 FOOT TELESCOPE FEBRUARY 1996 TECHNICAL DATA SHEET NO. 12 PAGE 2 OF 5

SYSTEM 3 dB PERSON(S) CALIBRATION SWITCHING RECEIVER FREQUENCY AMPLIFIER rEMPERATURE BANDWIDTH FEED TYPE POLARIZATION REMARKS IN NAME (GHz) TYPE VALUE SYSTEM (KELVIN) (MHz) CHARGE THREE 2HE UP TO 120 SINGLE BEAM ORTHOGONAL 2K FREQUENCY EITHER ORCUbAR OR UNEAR POLARIZATIONS OR ARE SELECTABLE. CIRCULAR POLARIZATION DUAL _ 1.30-1.36 UNEAR NORROO 1.3-1.8 0Hz 1.30-1.80 CHANNa 19-25 .FEED 1.36-1.43 OR AND POLARIZATION REQUIRES ADJUSTMENTS FROM THE CONTROL SWITCHING ROOM. BAND CHANGE REQUIRES 2 TO 3 Rx COOLED HFET UMITED 1 1.60-1.72 L_ CIRCULAR (SIMMONS) ZEEMAN 1.36-1.43 200K OR HOURS. OBSERVATIONS OUTSIDE STATED FEED ZEEMAN 1.8-1.72 NOISE ADDING BANDS POSSIBLE AT REDUCED EFFICIENCIES.

UP TO 250 TWO 2HE DUAL APPROX 1.6K BAND CHANGE REQUIRES FEED CHANGE. THIS SINGLE BEAM ORTHOGONAL AND 2.9-3.4 CHANNa 384:4 UNEAR TAKES 2-3 HOURS. FREQUENCY SMTCHING FEED 2.90-3.1 150K REQUIRES 50 MS BLANKING TIME. COOLED FET UMITED 3.20-3.4 FREQUENCY BEHRENS 2-5 0Hz SWTCHING Rx NOISE ADDING UP TO 200 (HALL) DUAL ONE 2HE 3K RECEIVER BAND UMITED BY 4.6-4.8 GHz FEED. 4.8-5.0 CHANNa 28±5 SINGLE BEAM CIRCULAR AND FREQUENCY SVATCH1NG REQUIRES 50 MS FEED 4.6-4.8 150K BLANKING TIME. COOLED HFET UMITED

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

COOLED FREQUENCY OR 8-10 28-34 500 CASSEGRA1N DUAL CIRCULAR 2-4K HFET NUTATOR BEAM

COOLED FREQUENCY OR 25-32 500 CASSEGRAIN DUAL CIRCULAR 2-4K 12-15.4 HFET NUTATOR BEAM FREQUENCY OR 18.0-28.5 COOLED 30-60 500 CASSEGRAIN DUAL CIRCULAR 3-7K TWO BANDS: 18.0-22.5, 22.0-26.5 HFET NUTATOR BEAM 4 HOURS TO SWTCH BANDS CASSEGRA1N STENNES SHARES DEWAR WTH 12-15.4 Rx RECEIVERS 26-36 COOLED 8O-10O 500 CASSEGRAIN SINGLE FIXED 7-14K FREQUENCY OR 4 HOURS TO INSTALL 26-38 FEED (DUNBRACK) HFET UNEAR NUTATOR BEAM 26-36 IS COVERED IN TWO BANDS 30 MINUTES TO CHANGE BANDS

26 NRAO FRONT-END STATUS 12 METER TELESCOPE FEBRUARY 1996 TECHNICAL DATA SHEET NO. 12 PAGE 3 OF 5

RECEIVER CONTINUUM 3 dB PERSON(S) FREQUENCY AMPLIFIER CALIBRATION SWITCHING TEMPERATURE SENSITIVITY BANDWIDTH FEED TYPE POLARIZATION REMARKS IN (GHZ) TYPE (KELVIN) (JANSKY V5R) (MHz) VALUE SYSTEM CHARGE

60-100 COOLED HORN-LENS DUAL NUTATING 66-118 SIS MIXER 1.0 600 6 K SINGLE-SIDEBAND MIXERS PfcM-UIO SS8 + OFFSET PARABOLA UNEAR SUBRERECTOR

30 NOT DUAL POLARIZATION NUTATING UNDER CONSTRUCTION 70-115 SIS MIXER 600 8 CHANNa 6 K SHILLUE DSB MEASURED 4 BEAMS SUBREFLECTOR COUPLE ltD MARCH 97

100-180 NOT COOLED HORN-LENS DUAL NUTATING 130-170 SIS MIXER 600 SINGLE-SIDEBAND MIXERS PERFETTO SSB MEASURED + OFFSET PARABOLA LINEAR - SUBREFLECTOR

150-400 NOT DUAL NUTATING SINGLE-SIDEBAND FILTER 200-300 SIS MIXER 600 COOLED HORN-LENS - PERFETTO SS8 MEASURED LINEAR SUBREFLECTOR IMAGE TERMINATED IN COLD LOAD

27 NRAO FRONT-END STATUS VERY LARGE ARRAY FEBRUARY 1996 TECHNICAL DATA SHEET NO. 12 PAGE 4 OF 5

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

DUAL NOISE INJECTION, UNCOOLED 74 O-M200 0.8 PRIME ORTHOGONAL 120 9.6 Hz. ANTENNAS 3, 6. 7, 11. 15, 19, 21 * 26 UUE FET CIRCULAR 50 PERCENT CYCLE

3 MHz DUAL NOISE INJECTION, UNCOOLED PRIME 306- 150 (UMITED BY ORTHOGONAL 10 9.6 Hz. UUE FET FOCUS 343 INTERFERENCE) CIRCULAR 50 PERCENT CYCLE.

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

DUAL 4 NOISE INJECTION. 4600- COOLED 60 55 CASSEGRAIN ORTHOGONAL 9.8 Hz. UUE 5000 HFET CIRCULAR 60 PERCENT CYCLE.

DUAL NOISE INJECTION. COOLED 8000- 35 65 CASSEGRAIN ORTHOGONAL 4 9.6 Hz. UUE 8800 HFET CIRCULAR 50 PERCENT CYCLE.

DUAL NOISE INJECTION, 14400- COOLED 110 55 CASSEGRAIN ORTHOGONAL 7 9.6 Hz, UUE 15400 FET CIRCULAR 60 PERCENT CYCLE.

DUAL NOISE INJECTION, 22000- COOLED 130 55 CASSEGRAIN ORTHOGONAL 10 9.6 Hz, UUE 24000 HFET CIRCULAR 50 PERCENT CYCLE.

28 NRAO FRONT-END STATUS VERY LONG BASELINE ARRAY FEBRUARY 1996 TECHNICAL DATA SHEET NO. 12 PAGE 5 OF 5

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

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

DUAL NOISE INJECTION. 596- WARM PRIME 200 30 OR 4 ORTHOGONAL 5 80 Hz. UUE 622 FET FOCUS CIRCULAR 50 PERCENT CYCLE.

DUAL NOISE INJECTION, COOLED 1350- 30 128 CASSEGRAIN ORTHOGONAL 2 80 Hz, UUE 1750 HFET CIRCULAR 50 PERCENT CYCLE.

DUAL NOISE INJECTION, 2150- COOLED 35 126 CASSEGRAIN ORTHOGONAL 2 80 Hz, HFET UUE 2350 CIRCULAR 50 PERCENT CYCLE.

DUAL NOISE INJECTION. 4800- COOLED 40 128 CASSEGRAIN ORTHOGONAL 2 80 Hz, UUE HFET 5100 CIRCULAR 50 PERCENT CYCLE.

DUAL NOISE INJECTION. 8000- COOLED 37 128 CASSEGRAIN ORTHOGONAL 3 80 Hz, UUE HFET 8800 CIRCULAR 50 PERCENT CYCLE.

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

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

DUAL NOISE INJECTION, 21700- COOLED 100 128 CASSEGRAIN ORTHOGONAL 5 80 Hz, UUE HFET 24100 ORCULAR 50 PERCENT CYCLE.

29 NRAO - STAFF AND VISITOR PUBLICATIONS 1995

AALTO, S.; BOOTH, R.S.; BLACK, J.H.; and JOHANSSON, L.E.B. "Molecular Gas in Starburst Galaxies: Line Intensities and Physical Conditions.,, MA 300:369-384,1995.

ABADA-SIMON, M.; BASTIAN, T.S.; HORNE, K.; ROBINSON, EX.; and BOOKBINDER, J.A. "The Radio and Optical Flares of AE Aquarii." In: Cape Workshop on Magnetic Cataclysmic Variables (ASP, ed. Buckley & Warner): 355-358,1995.

AKUJOR, C.E. and GARRINGTON, S.T. "Compact Steep-Spectrum Sources - Polarisation Observations at 1.6,4.9,8.4 and 15 GHz." A&AS 112:235-255,1995.

ALLEN, S.W. "Starbursts in Cooling Flows: Blue Continua and Emission-Line Nebulae in Central Cluster Galaxies." MNRAS 276:947-960. 1995.

ALLOIN, D.; SANTOS-LLEO, M.; PETERSON, B.M.; WAMSTEKER, W.; ALTBERI, B.; BRINKMANN, W.; CLAVEL, J.; CRENSHAW, D.M.; GEORGE, I.M.; GLASS, I.S.; JOHNSON, W.N.; KRISS, G.A.; MALKAN, M.A.; POLIDAN, R.S.; REICHERT, G.A.; RODRIGUEZ-PASCUAL, P.M.; ROMANISHIN, W.; STARR, C.H.; STRIPE, G.M.; TAYLOR, M.; TURNER, T.J.; VEGA, H.; WINGE, C; and WOOD, D.O.S. "A Snapshot of the Continuous Emission of the Active Galactic Nucleus in NGC 3783 from Gamma-Ray to Radio Wavelengths." MA 293:293-308,1995.

ALTSCHULER, D.R.; GURVTTS, L.I.; ALEF, W.; DENNISON, B.; GRAHAM, D.; TROTTER, A.S.; and CARSON, J.E. "The Centi-Arcsecond Structure of 16 Low-Frequency Variable Sources at 92 cm." A&AS 114:197-214,1995.

ANANTHARAMAIAH, K.R.; GOTHOSKAR, P.; and CORNWELL, T.J. "Radio Synthesis Imaging of Scatter-Broadening at Small Solar Elongations." J. Ap. Ast. 16 (suppl): 165-167,1995.

ANANTHARAMAIAH, K.R.; LOCKMAN, F.J.; KANTHARIA, N.G.; and ROSHI, A.D. "Ionized Gas in the Inner Galaxy." J. Ap. Ast. 16 (suppl): 269-271,1995.

ANANTHARAMAIAH, K.R.; ZHAO, J.-H.; GOSS, W.M.; and VIALLEFOND, F. "Radio Recombination Lines from External Galaxies." J. Ap. Ast. 16 (suppl): 273-274,1995.

ANDERSEN, V. and OWEN, F.N. "The Far-Infrared-Radio Relation in Cluster Spiral Galaxies." AJ 109:1582-1591,1995.

30 ANDERSON, M.C.; KEOHANE, J.W.; and RUDNICK, L. "The Polarization and Depolarization of Radio Emission from Supernova Remnant Cassiopeia A." AeI441: 300-306,1995.

ANDERSON, M.C. and RUDNICK, L. "The Deceleration Powering of Synchrotron Emission from Ejecta Components in Supernova Remnant Cassiopeia A." AEJ441: 307-333,1995.

ANGLADA, G.; ESTALELLA, R.; MAUERSBERGER, R.; TORRELLES, J.M.; RODRIGUEZ, L.F.; CANTO, J.; HO, P.T.P.; and D'ALESSIO,?. "The Molecular Environment oftheHH 34 System." ApJ 443: 682-697,1995.

ARZOUMANIAN, Z.; THORSETT, S.E.; and TAYLOR, J.H. "The Masses of Two Binary Pulsar Systems." In: Millisecond Pulsars (ASP, ed. Fruchter et al): 201-204,1995.

BAAN, W.A. and HASCHICK, A.D. "Nuclear Antics of IC 4553 (Arp 220)" AgJ 454: 745-748,1995.

BAAN, W.A. and IRWIN, J.A. "The Nuclear Structure of NGC 3079." AgJ 446: 602-615,1995.

BACKER, D.C. and THORSETT, S.E. "PSR1620-26-A Triple System?" In: Millisecond Pulsars (ASP, ed. Fruchter et al): 387-390,1995.

BAGCHI, J. and KAPAHI, V.K. "A VLA 20 and 90 Centimetre Radio Survey of Distant Abell Clusters with Central cD Galaxies." J. Ap. Ast. 16 (suppl): 202,1995.

BALL, L; KESTEVEN, M.J.; CAMPBELL-WILSON, D.; TURTLE, A.J.; and HJELLMING, R.M. "Radio Observations of GRS 1124-68 (X-ray Nova Muscae 1991)." MNRAS 273:722-730,1995.

BALSER, D.S.; BANIA, T.M.; ROOD, R.T.; and WILSON, T.L. "The Continuum Structure of 11 Galactic H H Regions." ApJS 100:371-388, 1995.

BARNBAUM, C. and HINKLE, K.H. "Infrared and Optical Velocities of Carbon Stars." AJ 110: 805-822,1995.

BARNBAUM, C; MORRIS, M.; and KAHANE, C. "Evidence for Rapid Rotation of the Carbon Star V Hydrae." ApJ 450: 862-875,1995.

BARTEL, N.; BIETENHOLZ, M.F.; and RUPEN, M.P. "The Nuclear Region of the Spiral Galaxy M81." Proc. Natl. Acad. Sci. OJS^ 92: 11374-11376,1995.

31 BARTEL, N.; SORATHIA, B.; BIETENHOLZ, M.F.; CARILLI, C.L.; and DIAMOND, P. "The Nuclear Jet and Counterjet Region of the Radio Galaxy Cygnus A." Proc. Natl. Acad. Sci. OJS^ 92: 11371-11373,1995.

BARTHEL, P.D.; CONWAY, J.E.; MYERS, S.T.; PEARSON, T.J.; and READHEAD, A.C.S. "New Superlmninal Quasar 1633+382 and the Blazar-Gamma-Ray Connection." ApJ444:L21-L24,1995.

BASTIAN, T.S. "Angular Scattering of Radio Waves: Implications for Mode Coupling in the Solar Corona." ApJ 439:494-498,1995.

BASTIAN, T.S. "Radio Diagnostics of Conditions in the Solar Atmosphere." In: Infrared Tools for Solar Astrophysics (World, ed. Kuhn etal.): 115-126,1995.

BAUDRY, A. and MENTEN, K.M. "VLA Observations of Highly Excited OH Absorption Toward W3 (OH)" A&A 298: 905-912,1995.

BEASLEY, AJ. and CONWAY, J.E. "VLBI Phase-Referencing." In: Very Long Baseline Interferometrv and the VLBA (ASP, ed. Zensus etal): 327-343,1995.

BECKER, R.H. and WHITE, RX. "An Eight Year Study of the Radio Emission from the WR Binary HD 193793." IAU Svmp. 163:450-459, 1995.

BECKER, R.H.; WHITE, R.L.; and HELFAND,D.J. "The FIRST Survey: Faint Images of the Radio Sky at Twenty Centimeters." ApJ 450: 559-577,1995.

BELL, M.B. "Independent Confirmation of the 8.665 GHz Hyperfine Line of 3He+ in W51." Ael 453: 773-778,1995.

BELL, M.B. and MATTHEWS, H.E. "Detection of C3N in the Spiral Arm Gas Clouds in the Direction of Cassiopeia A." ApI 438: 223-225, 1995.

BENSON, J.M. "The VLBA Correlator." In: Very Long Baseline Interferometrv and the VLBA (ASP, ed. Zensus et al): 117-131,1995.

BENZ, A.O.; ALEF, W.; and GUDEL, M. "VLBI Observations of Single Main-Sequence M Stars." MA 298:187-192,1995.

BICAY, M.D.; KOJOIAN, G.; SEAL, J.; DICKINSON, D.F.; and MALKAN, M.A. "A Multifrequency Radio Continuum and IRAS Faint Source Survey of Markarian Galaxies." ApJS 98:369-440,1995.

BIRETTA, J.A.; ZHOU, F.; and OWEN, F.N. "Detection of Proper Motions in the M87 Jet." ApJ 447: 582-596,1995.

32 BLUNDELL, K.M. and LACY, M. "A Multi-Radio-Frequency Study of the Radio-Quiet Quasar E1821+643." MNRAS 274: L9-L13,1995.

BOBROWSKY, M.; ZULSTRA, A.A.; GREBEL, E.K.; TINNEY, C.G.; TE LINTEL HEKKERT, P.; VAN DE STEENE, G.C.; LIKKEL, L; and BEDDING, T.R. "He 3-1475 and Its Jets." ApJ 446: L89-L92,1995.

BOHRINGER, H.; NULSEN, P.E.; BRAUN, R.; and FABIAN, A.C. "The Interaction of the Radio Halo of M87 with the Cooling Intracluster Medium of the Virgo Cluster." MNRAS 274: L67-L71,1995.

BONTEMPS, S.; ANDRE, P.; and WARD-THOMPSON, D. "Deep VLA Search for the Youngest Protostars: A Class 0 Source in the HH 24-26 Region." A&A 297: 98-102,1995.

BOUGHN, S.P. and USON, J.M. "Constraints on the Dwarf Star Content of Dark Matter." Phvs. Rev. Lett. 74: 216-219.1995.

BOUTON, E.N. and STEVENS-RAYBURN, S. "The Preprint Perplex in an Electronic Age." Vistas Astron. 39:179-185,1995.

BOWER, G.C.; FORSTER, J.R.; WRIGHT, M.; and BACKER, D. "NRAO 530." IAU Circ. 6173: 13 May 1995.

BOWER, G.; WILSON, A.; MORSE, J.A.; GELDERMAN, R.; WHITTLE, M.; and MULCHAEY, J. "Radio and Emission-Line Jets in the Type 2 Seyfert Galaxy Markarian 1066 (UGC 2456)" £^454:106-118,1995.

BRAINE, J.; WYROWSKI, F.; RADFORD, S.J.E.; HENKEL, C; and LESCH, H. "CO (1-0) Observations of the Cooling Flow Galaxy NGC 1275 with the IRAM Interferometer." A&A 293: 315-331,1995.

BRAUN, R. "Resolved Atomic Super-Clouds in Spiral Galaxies." A&AS 114:409-438,1995.

BREGMAN, J.N.; HOGG, D.E.; and ROBERTS, M.S. "The Interaction Between Hot and Cold Gas in Early-Type Galaxies." ApJ 441: 561-567,1995.

BURNS, J.O.; ROETTIGER, K.; PINKNEY, J.; PERLEY, R.A.; OWEN, F.N.; and VOGES, W. "Evidence for an On-Going Cluster/Group Merger in Abell 2255." ApJ 446: 583-593,1995.

BUTNER, H.M.; LADA, E.A.; and LOREN, R.B. "Physical Properties of Dense Cores: DCO+ Observations." AgJ 448:207-225,1995.

CAMILO, F. and NICE, D.J. "Timing Parameters of 29 Pulsars." AgJ 445: 756-761,1995.

33 CAMPBELL, R.M.; LEHAR, J.; COREY, B.E.; SHAPIRO, I.I.; and FALCO, E.E. "VLBI Observations of the Gravitational Lens System 0957+561." AI HO: 2566-2569,1995.

CAPETTI, A.; FANTI, R.; and PARMA, P. "Radio Galaxies of Intermediate Radio Luminosity: A Discussion of the Radio Properties of B2 0836+29, B2 0844+31 and B2 1521+28." MA 300: 643-658,1995.

CARILLI, CX. "The Bizarre Structure of the z = 3.4 Radio Galaxy B2 0902+343." A&A 298: 77-86,1995.

CARILLI, CX. "Neutral Hydrogen 21 cm Quasar Absorption Line Systems." J. Ap. Ast. 16 (suppl): 163-169,1995.

CHANDLER, C.J.; CARLSTROM, J.E.; and SCOWXE, N.Z. "Infrared CO Emission from Young Stars: Accretion Disks and Neutral Winds." AgJ 446: 793-800,1995.

CHANDLER, C.J. and DE PREE, C.G. "Vibrational Ground-State SiO J=l-0 Emission in Orion IRc2 Imaged with the VLA." AgJ 455: L67-L71,1995.

CHANDLER, C.J.; KOERNER, D.W.; SARGENT, A.I.; and WOOD, D.O.S. "Dust Emission from Protostars: The Disk and Envelope of HH 24 MMS." ApI 449: L139-L149,1995.

CHANDLER, C.J.; TEREBEY, S.; BARSONY, M.; and MOORE, T.J.T. "The Small-Scale Outflow Structure of Embedded Sources in Taurus." Ae&&£ 224: 109-112,1995.

CHARNLEY, S.B. and BUTNER, H. "Molecular Signatures of MHD Waves." Ap&SS 224: 443-444,1995.

CHEN, H.; MYERS, P.C.; LADD, E.F.; and WOOD, D.O.S. "Bolometric Temperature and Young Stars in the Taurus and Ophiuchus Complexes." AEl 445: 377-392,1995.

CHEN, H.; ZHAO, J.H.; and OHASHI, N. "Dust Emission from L1641N: An Optically Thick CircumsteUar Disk?" AEI 450: L71-L74,1995.

CHENGALUR, J.N.; GIOVANELLI, R.; and HAYNES, M.P. "VLA Observations of HI 1225+01." AI 109: 2415-2427,1995.

CHERNIN, L.M. "Water Masers in the L1448C Outflow." AEI 440: L97-L99,1995.

CILIEGI, P.; ELVIS, M.; WILKES, B.J.; BOYLE, B.J.; MCMAHON, R.G.; and MACCACARO, T. "The Cambridge-Cambridge ROSAT Serendipity Survey - III. VLA Observations and the Evolution of Radio-Quiet and Radio-Loud Objects." MNRAS 277: 1463-1476,1995.

34 CLARK, B.G. "Interferometers and Coherence Theory." In: Very Lone Baseline Interferometrv and the VLBA (ASP, ed. Zensus et al): 3-16, 1995.

CODELLA, C. and FELLI, M. "H20 Masers Without Associated Diffuse H H Regions: An Earlier Evolutionary Phase?" A&A 302: 521-527, 1995.

COHEN, M.H. and KELLERMANN, K.I. "Quasars and Active Galactic Nuclei: High Resolution Radio Imaging." Proc. Natl. Acad. Sci. OJS^ 92: 11339-11341,1995.

COLOMER, F. "VLBI Study of the SiO Maser Emission at 43 GHz in the Circumstellar Envelope of R Cas." Ap&SS 224:445-446,1995.

CONDON, J.J.; ANDERSON, E.; and BRODERICK, JJ. "Radio Identifications of Extragalactic IRAS Sources." AI 109: 2318-2354,1995.

CONWAY, J.E. and BLANCO, P.R. "HI Absorption toward the Nucleus of the Powerful Radio Galaxy Cygnus A: Evidence for an Atomic Obscuring Torus?" Agl 449: LI31 -LI34,1995.

CONWAY, J.E. and SAULT, R.J. "Multi-frequency Synthesis." In: Very Long Baseline Interferometrv and the VLBA (ASP, ed. Zensus et al): 309-325,1995.

CONWAY, J.E. and WROBEL, J.M. "A Helical Jet in the Orthogonally Misaligned BL Lacertae Object Markarian 501 (B1652+398)" ApJ 439:98-112,1995.

CORNWELL, T. "Imaging Concepts." In: Very Long Baseline Interferometrv and the VLBA (ASP, ed. Zensus et al): 39-56,1995.

COTTON, W.D. "Fringe-Fitting." In: Very Long Baseline Interferometrv and the VLBA TASP. ed. Zensus et att: 189-208.1995.

COTTON, W.D. "Polarimetry." In: Very Long Baseline Interferometrv and the VLBA (ASP, ed. Zensus et al): 289-308T1995.

COTTON, W.D.; FERETTI, L; GIOVANNINI, G.; VENTURI, T.; LARA, L; MARCAIDE, J.; WEHRLE, A.E. "VLBI Observations of a Complete Sample of Radio Galaxies. V. 3C346and4C31.04: Two Unusual Compact Steep Spectrum Sources." AEI 452: 605-612,1995.

GOTTEN, W.D.; HUNT, A.P.; and COTTON, J.E. "Paleozoic Vertebrate Tracksites in Eastern North America." In: Early Permian Footprints and Facies (New Mexico Museum of Natural History and Science Bulletin No. 6, ed. Lucas et al.): 189-211,1995.

COTTON, W.D.; TODY, D.; and PENCE, W.D. "Binary Table Extension to FITS." A&AS 113:159-166,1995.

35 DAHLEM, M.; KREYSING, H.-C; WHITE, S.M.; ENGELS, D.; CONDON, J.J.; HARMON, B.A.; ZHANG, S.N.; KOUVELIOTOU, C; PACIESAS, W.S.; and VOGES, W. "RE J1255+266: Detection of an Extremely Bright EUV Transient." A&A 295: L13-L16,1995.

DALLACASA, D.; COTTON, W.D.; FANTI, C; FANTI, R.; FOLEY, A.R.; SCHILIZZI, R.T.; and SPENCER, R.T. "5 GHz VLBI Polarization of 3C 138." A&A 299:671-679,1995.

DALLACASA, D.; FANTI, C; FANTI, R.; SCHILIZZI, R.T.; and SPENCER, R.E. "A Sample of Small Size Compact Steep-Spectrum Radio Sources. I. VLBI Images at 18 cm." A&A 295: 27-42,1995.

DAVIS, R.J.; BODE, M.F.; VAN DER HUCHT, K.A.; and WILLIAMS, P.M. "Radio Images of Wolf-Rayet 147." IAU Svmp. 163: 547-549, 1995.

DAYAL, A. and BIEGING, J.H. "The Distribution of HCN, H13CN, and CN in IRC +10216." ApI 439: 996-1010,1995.

DE GEUS, E.J. and DIGEL, S.W. "Molecular Gas and Star Formation Beyond the Optical Disk of the Galaxy." In: Phvsics and Chemistry of Interstellar Molecular Clouds 2 (Springer, ed. Winnewisser & Pelz): 30-32,1995.

DE PATER, I,; HEILES, C; WONG, M.; MADDALENA, R.J.; BIRD, M.K.; FUNKE, O.; NEIDHOEFER, J.; PRICE, R.M.; KESTEVEN, M.; CALABRETTA, M.; KLEIN, M.J.; GULKIS, S.; BOLTON, S.J.; FOSTER, R.S.; SUKUMAR, S.; STROM, R.G.; LEPOOLE, R.S.; SPOELSTRA, T.; ROBISON, M.; HUNSTEAD, R.W.; CAMPBELL-WILSON, D.; YE, T.; DULK, G.; LEBLANC, Y.; GALOPEAU, P.; GERARD, E.; and LECACHEUX, A. "Outburst of Jupiter's Synchrotron Radiation After the Impact of Comet Shoemaker-Levy 9." Science 268:1879-1883,1995.

DE PATER, I.; HEILES, C; WONG, M.; MADDALENA, R.J.; BIRD, M.K.; FUNKE, O; NEIDHOEFER, J.; PRICE, R.M.; KESTEVEN, M.; CALABRETTA, M.; KLEIN, M.J.; GULKIS, S.; BOLTON, S.J.; STROM, R.G.; LEPOOLE, R.A.; SPOELSTRA, T.; and ROBISON, M. "Jupiter's Synchrotron Radiation Throughout the Comet P/Shoemaker-Levy 9 Impact Period." Highlights Ast. 10: 637-638,1995.

DE PREE, C.G.; GAUME, R.A.; GOSS, W.M.; and CLAUSSEN, M.J. "The Sagittarius B2 Star-Forming Region. H. High-Resolution H66a Observations of Sagittarius B2 North." AeI 451:284-297,1995.

DE PREE, C.G.; RODRIGUEZ, L.F.; DICKEL, H.R.; and GOSS, W.M. "Rotation and Outflow in Compact H n Regions: VLA Observations of the Molecular and Ionized Gas in NGC 6334A and NGC 6334F." AEI 447:220-235,1995.

DE PREE, C.G.; RODRIGUEZ, L.F.; and GOSS, W.M. "Ultracompact H n Regions: Are Their Lifetimes Extended by Dense, Warm Environments?" Rev. Mex. Ast. Astf. 31: 39-44,1995.

36 DEY, A.; SPINRAD, H.; and DICKINSON, M. "Discovery of a z=2.76 Dusty Radio Galaxy?" AEI 440: 515-524,1995.

DIAMOND, P.J. "VLBA Data Reduction in Practice." In: Very Long Baseline Interferometrv and the VLBA (ASP, ed. Zensus et aD: 227-245. 1995.

DOUGHERTY, S.M.; BODE, M.F.; LLOYD, H.M.; DAVIS, R.J.; and EYRES, S.P. "High-Resolution Radio Images of the Symbiotic Star R Aquarii." MNRAS 272: 843-849,1995.

DOWNES, D.; SOLOMON, P.M.; and RADFORD, S.J.E. "New Observations and aNew Interpretation of CO(3-2) in IRAS F10214+4724." AEI453:L65-L68, 1995.

DOYLE, L.R.; VIKRAMSINGH, R.; WHITMIRE, D.P.; and HEATHER, N.C. "Circumstellar Habitable Zones and Mass Loss from Young Solar-Type Stars. II. Observational Considerations." In: Progress in the Search for Extraterrestrial Life (ASP, ed. Shostak): 195-204,1995.

DULK, G.A. and LEBLANC, Y. "Changes in Jupiter's Synchrotron Radiation Belts During and After SL-9 Impacts." In: European SL-9/JupiterWksD (ESO, ed. West & Bohnhardt): 381-386,1995.

DURIC, N.; GORDON, S.M.; GOSS, W.M.; VIALLEFOND, F.; and LACEY, C. "The Relativistic ISM in M33: Role of the Supernova Remnants." AEI445:173-181,1995.

DWARAKANATH, K.S.; OWEN, F.N.; and VAN GORKOM, J.H. "Detection of an HI Disk in Hydra A?" AEI 442: L1-L4,1995.

DYER, C.C.; KRONBERG, P.P.; PERLEY, R.A.; and ROSE, H.-J. "Gravitational Lensing With Polarization to Determine Galaxy Masses." Texas Svmp. Rel. Astrophvs. 17: 604-607,1995.

ECK, C.R.; COWAN, J.J.; ROBERTS, D.A.; BOFFI, F.R.; and BRANCH, D. "Radio Observations of the Type la Supernova 1986G as a Test of a Symbiotic-Star Progenitor." AEI451: L53-L55,1995.

ELIAS, N.M. II; QUIRRENBACH, A.; WITZEL, A.; NAUNDORF, C.E.; WEGNER, R.; GUINAN, E.F.; and MCCOOK, G.P. "Correlations Between the Flaring Radio Emission and Starspot Distribution of UX Arietis." AEI 439:983-990,1995.

ELMEGREEN, B.G.; SUNDIN, M.; KAUFMAN, M.; BRINKS, E.; and ELMEGREEN, D.M. "The Interaction Between Spiral Galaxies IC 2163 and NGC 2207. H. Models." Apl 453: 139-153,1995.

37 ELMEGREEN, D.M.; KAUFMAN, M.; BRINKS, E.; ELMEGREEN, B.G.; and SUNDIN, M. "The Interaction Between Spiral Galaxies IC 2163 and NGC 2207. I. Observations." AEI453:100-138,1995.

EMERSON, D.T. "Approaches to Multi-beam Data Analysis." In: Multi-feed Systems for Radio Telescopes (ASP, ed. Emerson & Payne): 309-317,1995.

EYRES, S.P.S.; KENNY, H.T.; COHEN, R.J.; LLOYD, H.M.; DOUGHERTY, S.M.; DAVIS, R.J., and BODE, M.F. "MERLIN Observations of Bipolar Outflow from HM Sagittae." MNRAS 274: 317-323,1995.

FANG, F. and SASLAW, W.C. "Some Implications of the Radial Peculiar Velocity Distribution of Galaxies." In: Wide-Field Spectroscopy and the Distant Universe (World, ed. Maddox & Aragon-Salamanca): 196-201,1995.

FEIGELSON, E.D.; LAURENT-MUEHLEISEN, S.A.; KOLLGAARD, RX; and FOMALONT, E.B. "Discovery of Inverse Compton X-rays in Radio Lobes." AEI449:L149-L152, 1995.

FERETTI, L.; DALLACASA, D.; GIOVANNINI, G.; and TAGLIANI, A. "The Magnetic Field in the Coma Cluster." A&A 302: 680-690, 1995.

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FERNANDEZ-CASTRO, T.; GONZALEZ-RIESTRA, R.; CASSATELLA, A.; TAYLOR, A.R.; and SEAQUIST, E.R. "The Active Phase of the Hot Component of Z Andromedae." Apl 442:366-380,1995.

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TIEFTRUNK, A.R.; WILSON, T.L.; STEPPE, H.; GAUME, R.A.; JOHNSTON, K.J.; and CLAUSSEN, M.J. "The W3 Core: Masses, Densities, Sizes and Kinematics." A&A 303 : 901-913,1995.

TOFANI, G.; FELLI, M.; TAYLOR, G.B.; and HUNTER, T.R. "Exploring the Engines of Molecular Outflows: Radio Continuum and H20 Maser Observations." A&AS 112:299-346,1995.

TONGUE, T.D. and WESTPFAHL, D.J. "Radio Continuum and HI Emission in Holmberg II: Tracing the Energy Balance in the ISM:" AI 109:2462-2469,1995.

TRMCCO, M.J.; BELL, R.A.; DORMAN, B.; and HUFNAGEL, B. "Derived Parameters for NGC 6791 from High-Metallicity Isochrones." AI 109:1697-1705,1995.

TRUONG-BACH; NGUYEN-Q-RIEU; GRAHAM, D.; and WOOTTEN, A. "Cyanopolyyne Molecules in Circumstellar Envelopes." Newsletter on Analysis of Astronomical Spectra (Electronic Supplement^ 22: 28,1995.

TSUTSUMI,T.; GREGORY, P.C; DURIC, N.; and TAYLOR, A.R. "VLA Structure of Variable Sources in the Galactic Plane. II." MHO: 238-250,1995.

TURNER, B.E. "Gaseous Refractory-Element Molecules in IRC 10216." AE&SS 224: 297-303,1995.

TURNER, B.E. "Physics and Chemistry of Small Molecular Clouds in the Galactic Plane, ffl. NH3." AEI 444: 708-720,1995.

TURNER, B.E. "The Physics and Chemistry of Small Translucent Molecular Clouds. V. SO and S02." AEI 455: 556-573,1995.

+ + TURNER, B.E. "The Physics and Chemistry of Translucent Molecular Clouds. IV. HCO andN2H ." AEI 449: 635-655,1995.

57 ULVESTAD, J.S.; ANTONUCCI, R.R.J.; and GOODRICH, R.W. "Radio Properties of Narrow-Lined Seyfert 1 Galaxies." AI 109: 81-86, 1995.

VALLEE,J.P. "IRAS 2306+1451: Evidence for a Possible Cloud-Cloud Collision." AI HO: 2256-2260,1995.

VALLEE, J.P. "KP Observations of CO 2-1 in the IRAS 2306+1451 Area: One Cloud or Two?" AI 109:1724-1728,1995.

VAN LANGEVELDE, H.J.; VAN DISHOECK, E.F.; SEVENSTER, M.N.; and ISRAEL, F.P. "Anomalously Excited OH and Competition Between Maser Transitions Toward Centaurus A." AEI 448: L123-L126,1995.

VAN OMMEN, T.D.; JONES, D.L.; PRESTON, R.A.; and JAUNCEY, DX. "Time Delay in the Einstein Ring PKS 1830-211." AEI 444: 561-566,1995.

VASISHT, G.; FRAIL, D.A.; and KULKARNI, S.R. "Radio Monitoring and High-Resolution Imaging of the Soft Gamma-Ray Repeater 1806-20." AEl 440: L65-L68,1995.

VENTURI, T.; CASTALDINI, C; COTTON, W.D.; FERETTI, L; GIOVANNINI, G.; LARA, L; MARCAIDE, J.M.; and WEHRLE, A.E. "VLBI Observations of a Complete Sample of Radio Galaxies. VI. The Two FRI Radio Galaxies B2 0836+29 and 3C 465." AEI 454:735-744, 1995.

VERSCHUUR, GX. "Zeeman Effect Observations of H I Emission Profiles. I. Magnetic Field Limits for Three Regions Based on Observations Corrected for Polarized Beam Structure." AEI451: 624-644,1995.

VERSCHUUR, GX. "Zeeman Effect Observations of HI Emission Profiles. II. Results of an Attempt to Confirm Previous Claims of Field Detections." AEI451: 645-659,1995.

VERTER, F. and HODGE, P. "GR 8: CO-to-H2 Conversion Factor at Extremely Low Metallicity." AEI 446: 616-621,1995.

VIKRAMSINGH, R. "Microwave Radiation from Young Solar Type Stars Observed with the Very Large Array in Socorro." Ap&SS 228: 135-150,1995.

WAKKER, B.P. and ADLER, D.S. "A CO Map of the Inner Spiral Arms of NGC 628." AI 109:134-139,1995.

WALKER, R.C. "Practical VLBI Imaging." In: Very Long Baseline Interferometrv and the VLBA (ASP, ed. Zensus et al): 247-266,1995.

58 WALKER, R.C. "What the VLBA Can Do for You: Capabilities, Sensitivity, Resolution, and Image Quality." In: Very Long Baseline Interferometrv and the VLBA (ASP, ed. Zensus et al): 133-157,1995.

WALLER, W.H.; MARSH, M.; BOHLIN, R.C; CORNETT, R.H.; DDCON, W.V.; ISENSEE, J.E.; MURTHY, J.; O'CONNELL, R.W.; ROBERTS, M.S.; SMITH, A.M.; and STECHER, T.P. "The Ultraviolet Sky as Observed by the Shuttle-Bome Ultraviolet Imaging Telescope." AI 110:1255-1284,1995.

WALTMAN, E.B.; GHIGO, F.D.; JOHNSTON, K.J.; FOSTER, R.S.; FIEDLER, R.L.; and SPENCER, J.H. "The Evolution of Outbursts in Cygnus X-3 at 2.25 and 8.3 GHz." AI 110: 290-299,1995.

WANG, H.; LAI, R.; LO, D.C.W.; STREIT, D.C; LIU, P.H.; DIA, R.M.; POSPDBSZALSKI, M.W.; and BERENZ, J. "A 140-GHz Monolithic Low Noise Amplifier." IEEE Microw. Guided Wave Lett. 5: 190-192,1995.

WEISBERG, J.M.; SIEGEL, M.H.; FRAIL, D.A.; and JOHNSTON, S. ''Neutral Hydrogen Absorption Measurements of Four Distant Pulsars and the Electron Density in the Inner Galaxy." AEI 447: 204-210,1995.

WELLS, D.C. "Visualization of GBT Geometry." ADASS 4: 148-151,1995.

WHITE, RX. and BECKER, R.H. "An 8 Year Study of the Radio Emission from the Wolf-Rayet Binary HD 193793 = WR 140." AEI 451: 352-358,1995.

WHITE, S.M. and FRANCIOSINI, E. "Circular Polarization in the Radio Emission of RS Canum Venaticorum Binaries." AEI 444: 342-349, 1995.

WHITNEY, J.H.; O'CONNELL, R.W.; ROOD, R.T.; HILL, R.S.; LANDSMAN, W.B.; BOHLIN, R.C.; ROBERTS, M.S.; SMITH, A.M.; and STECHER, T.P. "Far-Ultraviolet Luminosity Functions for M3 and Ml3." AJUO: 1722-1727,1995.

WILLIAMS, B.A. and VAN GORKOM, J.H. "HI Mapping of Compact Groups." In: Groups of Galaxies (ASP, ed. Richter & BomeY. 77-82. 1995.

WILSON, T.L.; GAUME, R.A.; JOHNSTON, K.J.; and TIEFTRUNK, A.R. "Dense Gas in the DR 21 Region: High-Resolution Imaging of the NH3 Inversion Lines." AEI452: 693-703,1995.

59 WINDHORST, R.A.; FOMALONT, E.B.; KELLERMANN, K.I.; PARTRIDGE, R.B.; RICHARDS, E.; FRANKLIN, B.E.; PASCARELLE, S.M.; and GRIFFITHS, R.E. "Identifications of Faint Radio Sources with Optically Luminous Interacting Disk Galaxies." Nature 375: 471-474,1995.

WOLF-CHASE, G.A. and WALKER, CK. "The Dense Gas Component of Outflows in the Monoceros OBI Dark Cloud." AEI 447:244-256, 1995.

WOLF-CHASE, G.A.; WALKER, C.K.; and LADA, CJ. "The Relationship of Dense Gas to Star Formation in the Monoceros OBI Dark Cloud." AEl 442:197-207,1995.

WOLLACK, E.J. "High-Electron-Mobility-Transistor Gain Stability and Its Design Implications for Wide Band Millimeter Wave Receivers." Rev. Sci. Instrum. 66: 4305-4312,1995.

WOMACK, M. and STERN, S.A. "(2060) Chiron = Comet 95P/Chiron." IAU Circ. 6193: 28 July 1995.

WOMACK, M.; STERN, S.A.; and FESTOU, M.C "Comet C/1995 01 (Hale-Bopp)." IAU Circ. 6276:21 December 1995.

WOOD, D.O.S. and MYERS, P.C "An IRAS Atlas of YSOs in Nearby Dark Clouds." Ap&SS 224:199-209,1995.

WOOTTEN, A. "Ammonia Images Near Objects with Class 0 Spectral Energy Distributions." Ap&SS 224:43-46,1995.

WROBEL, J.M. "VLBI Observing Strategies." In: Very Long Baseline Interferometrv and the VLBA (ASP, ed. Zensus et al): 411-427.1995.

WU, S.-Y.; PREUSS, E.; ALEF, W.; KELLERMANN, K.I.; and QIU, Y.-H. "The Faint Parsec-Scale Jet of 3C390.3 and Its Variations." Acta Astrophvs. Sinica 15: 26-33,1995.

XIANG, D. and TURNER, B.E. "Newly Discovered Galactic H20 Masers Associated With Outflows." ApJS 99: 121-133,1995.

XIZHEN, Z.; SPOELSTRA, T.A.T.; and YUMIN, W. "A Head-Tail Source Found with Miyun Synthesis Radio Telescope." J. Ap. Ast. 16 (suppl): 201-202,1995.

XU, W.; READHEAD, A.C.S.; PEARSON, T.J.; POLATIDIS, A.G.; and WILKINSON, P.N. "The First Caltech-Jodrell Bank VLBI Survey, m. VLBI and MERLIN Observations at 5 GHz and VLA Observations at 1.4 GHz." ApJS 99:297-348,1995.

60 YUSEF-ZADEH, F. and MEHRINGER, D.M. "An H20 Maser Near Sagittarius A East: Evidence for Active Massive Star Formation Near the Galactic Center." AEI452: L37-L40,1995.

YUSEF-ZADEH, F.; UCHIDA, K.I.; and ROBERTS, D. "Shock-Excited OH Maser Emission Outlining the Galactic Center Supernova Remnant G359.l-0.05." Science 270:1801-1804,1995.

YUSEF-ZADEH, F.; ZHAO, J.-H.; and GOSS, W.M. "HI 10a Observations of Sagittarius A West: Ionized Gas at Peculiar Velocities at the Galactic Center." AEI442: 646-652,1995.

ZENSUS, J.A.; COHEN, M.H.; and UNWIN, S.C "The Parsec-Scale Jet in Quasar 3C 345." AEI 443: 35-53,1995.

ZENSUS, J.A.; KIRCHBAUM, T.P.; and LOBANOV, A.P. "Morphology of High-Luminosity Compact Radio Sources." Proc. Natl. Acad. Sci. (US) 92: 11348-11355,1995.

ZHANG, Q. and HO, P.T.P. "Ammonia Maser in a Molecular Outflow Toward W51." AEI 450: L63-L66,1995.

ZHAO, J.-H.; GOSS, W.M.; and HO, P.T.P. "VLA OH Observations of High Negative Velocity Gas Toward Sagittarius A West: A High-Velocity Cloud Interacting with the Galactic Center." AEI450: 122-136,1995.

ZIURYS, L.M. and APPONI, A.J. "Confirmation of Interstellar HOC+: Reevaluating the [HCO^/tHOC4] Abundance Ratio." AEI455: L73-L76,1995.

ZIURYS, L.M.; APPONI, A.J.; GUELIN, M.; and CERNICHARO, J. "Detection of MgCN in IRC +10216: A New Metal-Bearing Free Radical." AEI445: L47-L50,1995.

61 ADDITIONS TO THE 1994 PUBLICATIONS LIST

ANANTHARAMAIAH, K.R.; GOTHOSKAR, P.; and CORNWELL, T.J. "Radio Synthesis Imaging of Anisotropic Angular Broadening of the Solar Wind." J. Ap. Ast. 15: 387-414,1994.

CHOI, PX "The Origin of CO Overtone Band Emission in YSOs." In: 1994 Undergraduate Symposium on Research in Astronomy (Keck Northeast Astronomy Consortium, ed. Gaustad): 5-8,1994.

DAHLEM, M. and BRINKS, E. "Radiobeobachtungen - Welches Instrument fur welche Anwendung? Teil 1: Eigenschaften von Einselteleskopen." Sterne und Weltraum 33: 350-357,1994.

DAHLEM, M. and BRINKS, E. "Radiobeobachtungen - Welches Instrument fur welche Anwendung? Teil 2: Eigenschaften und Funktionsweise von Interferometem." Sterne und Weltraum 33:446-452,1994.

DAHLEM, M. and BRINKS, E. "Radiobeobachtungen - Welches Instrument fur welche Anwendung? Teil 3: Astrophysikalische Strahlungsprozesse im Radiobereich." Sterne und Weltraum 33: 524-531,1994.

DAHLEM, M. and BRINKS, E. "Radiobeobachtungen - Welches Instrument fur welche Anwendung? Teil 4: Radioastronomische Messtechniken." Sterne und Weltraum 33: 692-702,1994.

HENSTOCK, D.R.; WILKINSON, P.N.; BROWNE, I.W.A.; TAYLOR, G.B.; READHEAD, A.C.S.; PEARSON, T.J.; VERMEULEN, R.C.; andXU,W. "A Global VLBI Search for Milli-lenses." In: EVN/JIVE Svmp. 2 (Torun Radio Astronomy Observatory, ed. Kus et al.): 79-86, 1994.

HJELLMING, R.M. and RUPEN, M.P. "X-ray Nova in Scorpius." IAU Circ. 6086,1 October 1994.

LANG, C.C. "The Sickle and the Pistol: Searching for Evidence of an Unconventional Ionization Mechanism." In: 1994 Undergraduate Symposium on Research in Astronomy (Keck Northeast Astronomy Consortium, ed. Gaustad): 35-37,1994.

SARAZIN, CX. "X-ray, Radio, and Optical Structures in Cooling Flow Clusters." In: Clusters of Galaxies (Ed. Frontieres, ed Durret et al.): 199-202,1994.

WANG, Y.; ZHANG, X.; and SPOELSTRA, T.A.T. "A Head-Tail Source Found With Miyun Synthesis Radio Telescope." Publ. Beijing Astron. Obs. 24: 12-17. 1994.

62