DOCSLIB.ORG

Information to Users

Total Page：16

File Type：pdf, Size：1020Kb

Download full-text PDF Read full-text

Load more

INFORMATION TO USERS While the most advanced technology has been used to photograph and reproduce this manuscript, the quality of the reproduction is heavily dependent upon the quality of the material submitted. For example: • Manuscript pages may have indistinct print. In such cases, the best available copy has been filmed. ® Manuscripts may not always be complete. In such cases, a note will indicate that it is not possible to obtain missing pages. ® Copyrighted material may have been removed from the manuscript. In such cases, a note will indicate the deletion. Oversize materials (e.g., maps, drawings, and charts) are photographed by sectioning the original, beginning at the upper left-hand corner and continuing from left to right in equal sections with small overlaps. Each oversize page is also filmed as one exposure and is available, for an additional charge, as a standard 35mm slide or as a 17”x 23” black and white photographic print. Most photographs reproduce acceptably on positive microfilm or microfiche but lack the clarity on xerographic copies made from the microfilm. For an additional charge, 35mm slides of 6”x 9” black and white photographic prints are available for any photographs or illustrations that cannot be reproduced satisfactorily by xerography. Order Number 8726612 The astrophysics of nebulae and active galactic nuclear emission-line regions: New methods and applications Cota, Stephen Andrew, Ph.D. The Ohio State University, 1987 U’lVI'I SOON.ZeebRd. Ann Arbor, MI 48106 The Astrophysics of Nebulae and Active Galactic Nuclear Emission-Line Regions: New Methods and Applications DISSERTATION Presented in Partial Fulfillment of die Requirements for the Degree Doctor of Philosophy in the Graduate School of The Ohio State University By Stqihen A. Cota, B. S. ***** The Ohio State University 1987 Reading Committee: Approved By Dr. Gary J. Ferland Dr. Jack A. Baldwin Dr. Eugene R. C^niotti Gary J. Ferland, Advisor Depariment of Astronomy To Sara -1- ACKNOWLEDGEMENTS It is with great pleasure that I thank my advisor. Dr. Gary J. Ferland. for his help and support in the completion of this dissertation. Thanks are due for both his oiginal research suggestions, which led to this dissertation, and for his almost daily guidance. I also want to warmly thank Dr. Eugene R. Capriotti for his constant help and advice. I owe special thanks to Dr. Jack A. Baldwin, Dr. Hagai Netzer, and Dr. Bradley M. Peterson, for reading this dissertation and for their suggestions. Finally, thanks go to Dr. David G. Lawrie, Dr. Gerald H. Newsom, and Dr. Bradley M. Peterson, for support and advice throughout the years. Nearly 5 years of graduate school has only proved that the task of obtaining a Ph.D. ever was, and ever will be, beyond the limits set by my character. Without the faith and support of my family and Mends, 1 never could have finished what 1 set out to do: 1 owe them all an enormous debt -u- VITA March 10,1960 Bom - Toledo, Ohio 1982 Phi Beta Kappa 1982 B. S., The Ohio State University, Columbus, Ohio 1983 Teaching Associate, Dq>artment of Astronomy, The Ohio State University, Columbus, Ohio 1983 - 198S Research Assistant, Departmmit of Astronomy, The Ohio State University, Columbus, Ohio 1984 Summer Research Assistant, National Astronomy Radio Observatory, Socorro, New Mexico 1986 Research Assistant, Department of Astronomy, The Ohio State University, at Lowell Observatory, Flagstaff, Arizona 1986 -1987 Presidential Fellow, The Ohio State University, Columbus, Ohio 1987 Research Assistant, Department of Astronomy, The Ohio State University, Columbus, Ohio PUBLICATIONS "The Double Broad-line Emitting Regions in NGC 5548 as Possible Evidence for a Supermassive Binary", B. M. Peterson, K. T. Kmrista, and S. A. Cota, Astrophysical Joiamal Letters , 312,1,1987. "Spectrophotometry of the Seyfot 1 Galaxy Arakelian 120", B. M. Peterson, and S. A. Cota, Astronomical Journal , 94,7,1987. "The Size of the Broad-Line Region in the Seyfert Galaxy NGC 4151", B. M. Peterson, and S. A. Cota, submitted to the AstropAyacof Journal, 1987. "Hydrogen Emissivity in Realistic Nebulae: The Effects of Velocity Fields and Internal Dust", S. A. Cota, and G. J. Ferland, submitted to ihoAstrophysical Journal, 1987. -u i- TABLE OF CONTENTS DEDICATION i ACKNOWLEDGEMENTS ü VITA iü LIST OF FIGURES iv LIST OF TABLES v CHAPTER PAGE I. INTRODUCTION 1 n . THREE-BODY RECOMBINATION TO THE HIGHLY EXCITED STATES OF ATOMS AND IONS: AN IMPORTANT PROCESS FOR NOVAE SHELLS AND BROAD-LINE EMPTUNG REGIONS OF ACTIVE GALAXIES 5 2.1 Introduction 5 2.2 Calculations 8 (a) Formalism and Assumptions 8 0)) Computational Details 11 2.3 Results 14 (a) Numerical Results 14 (b) Comparison With Previous Work 15 (c) Evaluation of Approximations 17 2.4 Discussion 19 (a) Late-Fhase Novae Shells 19 0>) H n Regions and Planetary Nebulae 20 (c) Emission-Line Regions of Active Galaxies 21 (i) Conventional Density BLRs m iNLRs 22 (ii) High Density BLRs 23 m . A SIMPLE BUT ACCURATE TREATMENT OF THE HYDROGEN ATOM 33 3.1 Introduction 33 3.2 Factors Influencing the Accuracy of Calculations of the HI Recombination Spectrum 36 (a) /-Mixing 36 0>) Atomic Data 38 (c) Truncation of the Hydrogen Atom 40 -IV- 3.3 A Simple Model Hydrogen Atom 43 (a) Model Hydrogen Atmn 44 0)) Averaging of the Rates and Populations 44 (c) Avoaging of the Eneigies and Statistical Weights 47 (d) Temperature Dqtendence of Collision and Radiative Recombination Rates 49 (e) Choice of 6 . and Results SI 3.4 Comparison With Previous Authors 55 (a) Equations for a Photoionized Slab 55 0>) Comparison to Low Density Calculations with die n-M ethod 58 (c) Comparison to High Deisity Calculations 58 (d) Comparisons at Low Temperatures 60 IV. THE RECOMBINATION SPECTRUM OF HELIUM I: THE EFFECTS OF PHOTOIONIZATION OF HYDRCXÎEN BY HE I RESONANCE PHOTONS ON THE SINGLET EMISSIVmES 89 4.1 Introduction 89 4.2 Calculations 91 (a) Helium I Singlet Energies and Transition Rates 92 (b) Line Transfer 94 (c) Temperature Dqiaidence 98 (d) Collisional Population o f 2^f £rmn 2^S 100 4.3 Results 104 4.4 Discussion 107 (a) Photoionization Models 107 (i) AGN Model 109 (« ) H / / Regions 110 (h i ) Planetary Nebulae 111 (b) Predicted Singlet Spectrum 111 (c) NGC 7027 113 V. HYDROGEN EMISSIYITY IN REALISTIC NEBULAE: THE EFFECTS OF VELOCITY FIELDS AND INTERNAL DUST 131 5.1 Introduction 131 5.2 Calculations 133 (a) The Hydrogen Atom 133 (i) The High-Density Undt 134 (« ) Low^ensity Limit 134 (b) Velocity Structure and Optical Depths 136 (c) Dust to Gas Ratio 137 (d) Radiative Transfer 139 -V- (e) Results 141 5.3 Applications 143 (a) The Orion Nebula 143 Çâ) Giant H n Regions 145 (c) Planetary Nebulae 147 (d) Nova Envelopes 148 5.4 Discussion 149 VI. THE NATURE OF THE IONIZING CONTINUUM IN SGR A WEST 156 6.1 Introduction 156 6.2 Obsmred Properties of Sgr A West 159 (a) Photoionization Models 159 (b) Geometry of Sgr A West 160 ({) Distribution m d Kinematics of the Ionized Gas 161 (ü ) Identification and Nature cf the Central Object 164 (c) Extinction 166 (i) The Near-IR Extinction Curve 166 (ü ) The Far-IR Extinction Curve 168 (ü i) Adopted Extinction 169 (d) Fine Structure Line Spectrum 170 (i) Uncertainties in the line Data 170 ( a ) Adopted Spectrum 172 (a ;) Comparison with Extragalactic Objects 172 (e) The Ionizing Continuum Shape 173 (J) The Hard X-and gamma-Ray Contmua 175 (a ) The Soft X-Ray Continuum 177 (Jii) The IR Continuum 178 (f) The Ionizing Continuum Strength 180 (i) Estimates from [Ne II] 12 J8 pm Fluxes 180 (ii) Estimates from Brackett line Fluxes 182 (Hi) Estimates from Radio Flux Denrities 183 (iv) Other Estimates 184 (g) Density 185 (i) Evidence for lo w Densities 185 (ii) Evidence for High Densities 186 (h) Abundances 188 6.3 The Broad-Line Region, 1RS 16 191 (a) Geometry 191 (b) The //e / %2.058 pm Line 191 (c) Density 194 6.4 Photoionization Calculations 197 6.5 Results 199 -VI- (a) 35,000 K Stellar Atmo^hœ 200 (b) 30,000 K Stellar Atmosphœ 201 (c) AGN Model 201 (d) 40,000 K Stellar Atmosphere 202 6 .6 Discussion 203 (a) Variants on the AGN Models of Sgr A West 204 (i) Formation of [Ar / / ] 7 jjfli and [Ne //] 12.8 pm in AGN Models 204 (« ) Turbulent Heating 206 (fii) Depletion qf Coolants 206 (iv) Optical Depths in the Fine Structure Lines 207 (v) Radiative Excitation 210 (b) Uncertainties in the Calculations 211 (/) Uncertainties in the Stellar Atmospheres 211 (« ) Incomplete or Inaccurate Atomic Data for Argon 211 (c) PredictitHis 213 (d) The Nature of Sgr A West 214 Vn. CONCLUSION 239 APPENDIX 243 BIBLIOGRAPHY 246 -vu- UST OF TABLES TABLE PAGE 1. Comparison o f N, vs. for Adams and Petrosian and the present work 2S 2. N, for Mh, (After Drake and Ulrich 1981) 61 3. Effective H p Recombination Coefficients and H I Line Ratios for Full and No I -Mixing; Case A 62 4. Effective H p Recombination Coefficients and H I Line Ratios for Full and No I -Mixing; Case B 62 5. Ctmparison of Collision Rates from the literature 63 6 . Real and Avemge Energies and Statistical Weights for Real and Fictitious Levels 64 7. Fits to the Radiative Recombination Coefficients for Level n 65 8 . Radiative Rates for m ^ 6 6 6 9. Avoaged Radiative Rates vs. rtc for Case A 67 10. Averaged Radiative Rates A vs. «g for Case B 67 11. Avaaged Radiative Rates A vs. for Case A 68 12. Avoaged Radiative Rates A vs. Re for Case B 6 8 13.
Recommended publications
  • COURT of CLAIMS of THE

    COURT of CLAIMS of THE

    REPORTS OF Cases Argued and Determined IN THE COURT of CLAIMS OF THE STATE OF ILLINOIS VOLUME 39 Containing cases in which opinions were filed and orders of dismissal entered, without opinion for: Fiscal Year 1987 - July 1, 1986-June 30, 1987 SPRINGFIELD, ILLINOIS 1988 (Printed by authority of the State of Illinois) (65655--300-7/88) PREFACE The opinions of the Court of Claims reported herein are published by authority of the provisions of Section 18 of the Court of Claims Act, Ill. Rev. Stat. 1987, ch. 37, par. 439.1 et seq. The Court of Claims has exclusive jurisdiction to hear and determine the following matters: (a) all claims against the State of Illinois founded upon any law of the State, or upon an regulation thereunder by an executive or administrative ofgcer or agency, other than claims arising under the Workers’ Compensation Act or the Workers’ Occupational Diseases Act, or claims for certain expenses in civil litigation, (b) all claims against the State founded upon any contract entered into with the State, (c) all claims against the State for time unjustly served in prisons of this State where the persons imprisoned shall receive a pardon from the Governor stating that such pardon is issued on the grounds of innocence of the crime for which they were imprisoned, (d) all claims against the State in cases sounding in tort, (e) all claims for recoupment made by the State against any Claimant, (f) certain claims to compel replacement of a lost or destroyed State warrant, (g) certain claims based on torts by escaped inmates of State institutions, (h) certain representation and indemnification cases, (i) all claims pursuant to the Law Enforcement Officers, Civil Defense Workers, Civil Air Patrol Members, Paramedics and Firemen Compensation Act, (j) all claims pursuant to the Illinois National Guardsman’s and Naval Militiaman’s Compensation Act, and (k) all claims pursuant to the Crime Victims Compensation Act.
  • Regional Oral History Off Ice University of California the Bancroft Library Berkeley, California

    Regional Oral History Off Ice University of California the Bancroft Library Berkeley, California

    Regional Oral History Off ice University of California The Bancroft Library Berkeley, California Richard B. Gump COMPOSER, ARTIST, AND PRESIDENT OF GUMP'S, SAN FRANCISCO An Interview Conducted by Suzanne B. Riess in 1987 Copyright @ 1989 by The Regents of the University of California Since 1954 the Regional Oral History Office has been interviewing leading participants in or well-placed witnesses to major events in the development of Northern California, the West,and the Nation. Oral history is a modern research technique involving an interviewee and an informed interviewer in spontaneous conversation. The taped record is transcribed, lightly edited for continuity and clarity, and reviewed by the interviewee. The resulting manuscript is typed in final form, indexed, bound with photographs and illustrative materials, and placed in The Bancroft Library at the University of California, Berkeley, and other research collections for scholarly use. Because it is primary material, oral history is not intended to present the final, verified, or complete narrative of events. It is a spoken account, offered by the interviewee in response to questioning, and as such it is reflective, partisan, deeply involved, and irreplaceable. All uses of this manuscript are covered by a legal agreement between the University of California and Richard B. Gump dated 7 March 1988. The manuscript is thereby made available for research purposes. All literary rights in the manuscript, including the right to publish, are reserved to The Bancroft Library of the University of California, Berkeley. No part of the manuscript may be quoted for publication without the written permission of the Director of The Bancroft Library of the University of California, Berkeley.
  • 15Th Annual Student Research and Creativity Celebration, SUNY Buffalo State

    15Th Annual Student Research and Creativity Celebration, SUNY Buffalo State

    I II III III I I I I I I I I 15th Annual Student Research and Creativity Celebration, SUNY Buffalo State I II III III I I I I I I I I Editor Jill K. Singer, Ph.D. Director, Office of Undergraduate Research Sponsored by Office of Undergraduate Research Office of Academic Affairs Research Foundation for SUNY/Buffalo State Cover Design and Layout: Carol Alex The following individuals and offices are acknowledged for their many contributions: Sean Fox, Ellofex, Inc. Tom Coates, Events Management, and staff, especially Maryruth Glogowski, Director, E.H. Butler Library, Mary Beth Wojtaszek and the library staff Department and Program Coordinators (identified below) Carole Schaus, Office of Undergraduate Research Kaylene Waite, Computer Graphics Specialist and very special thanks to Carol Alex, Center for Bruce Fox, Photographer Development of Human Services Department and Program Coordinators for the Fifteenth Annual Student Research and Creativity Celebration Lisa Anselmi, Anthropology Bill Lin, Computer Information Systems Kyeonghi Baek, Political Science Dan MacIsaac, Physics Saziye Bayram, Mathematics Candace Masters, Art Education Carol Beckley, Theater Amy McMillan, Biology Lynn Boorady, Fashion and Textile Technology Susan McMillen, Faculty Development Betty Cappella, Higher Education Administration Michaelene Meger, Exceptional Education Louis Colca, Social Work Michael Niman, Communication Michael Cretacci, Criminal Justice Jill Norvilitis, Psychology Carol DeNysschen, Dietetics and Nutrition Kathleen O’Brien, Hospitality and Tourism
  • DMAAC – February 1973

    DMAAC – February 1973

    LUNAR TOPOGRAPHIC ORTHOPHOTOMAP (LTO) AND LUNAR ORTHOPHOTMAP (LO) SERIES (Published by DMATC) Lunar Topographic Orthophotmaps and Lunar Orthophotomaps Scale: 1:250,000 Projection: Transverse Mercator Sheet Size: 25.5”x 26.5” The Lunar Topographic Orthophotmaps and Lunar Orthophotomaps Series are the first comprehensive and continuous mapping to be accomplished from Apollo Mission 15-17 mapping photographs. This series is also the first major effort to apply recent advances in orthophotography to lunar mapping. Presently developed maps of this series were designed to support initial lunar scientific investigations primarily employing results of Apollo Mission 15-17 data. Individual maps of this series cover 4 degrees of lunar latitude and 5 degrees of lunar longitude consisting of 1/16 of the area of a 1:1,000,000 scale Lunar Astronautical Chart (LAC) (Section 4.2.1). Their apha-numeric identification (example – LTO38B1) consists of the designator LTO for topographic orthophoto editions or LO for orthophoto editions followed by the LAC number in which they fall, followed by an A, B, C or D designator defining the pertinent LAC quadrant and a 1, 2, 3, or 4 designator defining the specific sub-quadrant actually covered. The following designation (250) identifies the sheets as being at 1:250,000 scale. The LTO editions display 100-meter contours, 50-meter supplemental contours and spot elevations in a red overprint to the base, which is lithographed in black and white. LO editions are identical except that all relief information is omitted and selenographic graticule is restricted to border ticks, presenting an umencumbered view of lunar features imaged by the photographic base.
  • METROPOLITAN Modes

    METROPOLITAN Modes

    THE CHICAGO DAILY TRIBUNE: SUNDAY, OCTOBER 4, 1874. 7 can think of its emitted New ven- modes. wearer onlv &a a goddeu* of the 1 announced by Mr. Thomas himself, prommiug and bad “just completed an oraUrio Orleans, when, after years of study, he clearing tho table, ami tho caustic was taken br .Northern mythology. i REVIEW OF AMUSEMENTS. that they include only the leading numbers : The Seasons of Life.” tmod to produce it. The press of Now Orleans mistake. Ff;o was forced to postpone an appear* METROPOLITAN enthusiastically, MATELASFU PILE FIRST CONCERT. Anna Brewster, writing from Borne to the commended him and the criti- auce at short notice. has taken tho faehjonahlo Tursn/.v Mar HITS. “ cisms of the leading journals of the country world by elomi. El u SIC. LVLSLsu, il, Jjuileiin. Eava : Xbo sal- J.UTybouV Brabm Philadelphia Keening more or favorable. Mr. JohnMcCullough, the well-known trage- who can aH'oiu a little piece cf it lias The season Orchestra Trium])hal Hj-nm, Op. 55 J.iiuimci; arc published for have all been ler-.s at a pair remarkable of Thomai.’ m r aries o£ the singers engaged and manager, "has purchased of Messrs. Styles and Novelties—l leant of nloevea; and from that amount New, bud lii'ftt time ■ Aiut-ncb. season at Thursday night Mr. Barrett i-lavs dian <■ tbe coming Ca; and Lent tbo George Hows right ~* i; concerts is over, having closed with the testi- K'pAf-parf u.i/nm ua Urci.fT.i u. nival and W. L.
  • She Smiles Sadly*.•

    She Smiles Sadly*.•

    Number 5 Volume XXVIII. SEATTLE, WASHINGTON, FEBRUARY 4, 1933 SHE SMILES SADLY*.• • Kwan - Yin, Chinese Goddess of Mercy, some­ times called the Goddess of Peace, has reason these days for that sardonic expression, although the mocking smile is by no means a new one; she has worn it since the Wei Dynasty, Fifth Century A. D. The Goddess is the property of the Bos­ ton Museum of Art.— Courtesy The Art Digest. Featured This Week: Stuffed Zoos, by Dr. Herbert H. Gowen "Two Can Play"—, by Mack Mathews Editorials: (Up Hill and Down, Amateur Orchestra In Dissent, by George Pampel Starts, C's and R's, France Buys American) A Woman's Span (A Lyrical Sequence), by Helen Maring two THE TOWN CRIER FEBRUARY 4, 1933 By John Locke Worcester. Illus­ Stage trated with lantern slides. Puget "In Abraham's Bosom'' (Repertory Sound Academy of Science. Gug­ Playhouse)—Paul Green's Pulit­ AROUND THE TOWN genheim Hall. Wednesday, Febru­ zer prize drama produced by Rep­ ary 22, 8:15 p. m. ertory Company, with cast of Se­ attle negro actors. Direction Flor­ By MARGARET CALLAHAN Radio Highlights . , ence Bean James. A negro chorus sings spirituals. Wednesdays and Young People's Symphony Concert Fridays for limited run. 8:30 p.m. "Camille" (Repertory Playhouse) — Spanish ballroom, The Olympic. —New York Philharmonic, under direction of Bruno Walter. 8:30- "Funny Man" (Repertory Play­ All-University drama. February February 7, 8:30 p. m. 16 and 18, 8:30 p. m. Violin, piano trio—Jean Margaret 9:15 a. m. Saturday. KOL. house)—Comedy of old time Blue Danube—Viennese music un­ vaudeville life by Felix von Bres- Crow and Nora Crow Winkler, violinists, and Helen Louise Oles, der direction Dr.
  • SMART-1 IMPACT GROUND-BASED CAMPAIGN P. Ehrenfreund, B.H. Foing, C. Veillet, D. Wooden, L. Gurvits, A. C. Cook, D. Koschny, N. Biver, D

    SMART-1 IMPACT GROUND-BASED CAMPAIGN P. Ehrenfreund, B.H. Foing, C. Veillet, D. Wooden, L. Gurvits, A. C. Cook, D. Koschny, N. Biver, D

    Lunar and Planetary Science XXXVIII (2007) 2446.pdf SMART-1 IMPACT GROUND-BASED CAMPAIGN P. Ehrenfreund, B.H. Foing, C. Veillet, D. Wooden, L. Gurvits, A. C. Cook, D. Koschny, N. Biver, D. Buckley, J.L. Ortiz, M. Di Martino, R. Dantowitz, B. Cooke, V. Reddy, M. Wood, S. Vennes, L. Albert, S. Sugita, T. Kasuga, K. Meech, A. Tokunaga, P. Lucey, A. Krots, E. Palle, P. Montanes, J. Trigo-Rodriguez, G. Cremonese, C. Barbieri, F. Ferri, V. Mangano, N. Bhandari, T. Chandrasekhar, N. Kawano, K. Matsumoto, C. Taylor, A. Hanslmeyer, J. Vaubaillon, R. Schultz, C. Erd, P. Gondoin, AC Levasseur-Regourd, M. Khodachenko, H. Rucker, et al. (SMART-1 Coordinated observations group), M. Burchell, M. Cole, D. Koschny, H. Svedhem, A. Rossi, T. Cola- prete, D. Goldstein, P.H. Schultz, L. Alkalai, B. Banerdt, M. Kato, F. Graham, A. Ball, E. Taylor, E. Baldwin, A. Berezhnoy, H. Lammer et al (SMART-1 impact prediction group), D. Koschny, M. Talevi, J. Landeau-Constantin, B. v. Weyhe, S. Ansari, C. Lawton, J.P. Lebreton, L. Friedman, B. Betts, M. Buoso, S. Williams, A. Cirou, L. David, O. Sanguy, J.D.Burke, P.D. Maley, V.M. de Morais, F. Marchis, J.M. H. Munoz, J.-L. Dighaye, C. Taylor et al (SMART-1 outreach and amateur astronomer coordination), SMART1 Impact Campaign Team, ESTEC/SCI-S, postbus 299, 2200 AG Noordwijk, NL, Europe, (P. [email protected],[email protected]) Introduction: SMART-1 was launched in 2003 and was orbiting the Moon on a 5 hours period until impact Predicted effects and proposed observations: on 3 September 2006.
  • Appendix I Lunar and Martian Nomenclature

    Appendix I Lunar and Martian Nomenclature

    APPENDIX I LUNAR AND MARTIAN NOMENCLATURE LUNAR AND MARTIAN NOMENCLATURE A large number of names of craters and other features on the Moon and Mars, were accepted by the IAU General Assemblies X (Moscow, 1958), XI (Berkeley, 1961), XII (Hamburg, 1964), XIV (Brighton, 1970), and XV (Sydney, 1973). The names were suggested by the appropriate IAU Commissions (16 and 17). In particular the Lunar names accepted at the XIVth and XVth General Assemblies were recommended by the 'Working Group on Lunar Nomenclature' under the Chairmanship of Dr D. H. Menzel. The Martian names were suggested by the 'Working Group on Martian Nomenclature' under the Chairmanship of Dr G. de Vaucouleurs. At the XVth General Assembly a new 'Working Group on Planetary System Nomenclature' was formed (Chairman: Dr P. M. Millman) comprising various Task Groups, one for each particular subject. For further references see: [AU Trans. X, 259-263, 1960; XIB, 236-238, 1962; Xlffi, 203-204, 1966; xnffi, 99-105, 1968; XIVB, 63, 129, 139, 1971; Space Sci. Rev. 12, 136-186, 1971. Because at the recent General Assemblies some small changes, or corrections, were made, the complete list of Lunar and Martian Topographic Features is published here. Table 1 Lunar Craters Abbe 58S,174E Balboa 19N,83W Abbot 6N,55E Baldet 54S, 151W Abel 34S,85E Balmer 20S,70E Abul Wafa 2N,ll7E Banachiewicz 5N,80E Adams 32S,69E Banting 26N,16E Aitken 17S,173E Barbier 248, 158E AI-Biruni 18N,93E Barnard 30S,86E Alden 24S, lllE Barringer 29S,151W Aldrin I.4N,22.1E Bartels 24N,90W Alekhin 68S,131W Becquerei
  • Lick Observatory Records: Photographs UA.036.Ser.07

    Lick Observatory Records: Photographs UA.036.Ser.07

    http://oac.cdlib.org/findaid/ark:/13030/c81z4932 Online items available Lick Observatory Records: Photographs UA.036.Ser.07 Kate Dundon, Alix Norton, Maureen Carey, Christine Turk, Alex Moore University of California, Santa Cruz 2016 1156 High Street Santa Cruz 95064 [email protected] URL: http://guides.library.ucsc.edu/speccoll Lick Observatory Records: UA.036.Ser.07 1 Photographs UA.036.Ser.07 Contributing Institution: University of California, Santa Cruz Title: Lick Observatory Records: Photographs Creator: Lick Observatory Identifier/Call Number: UA.036.Ser.07 Physical Description: 101.62 Linear Feet127 boxes Date (inclusive): circa 1870-2002 Language of Material: English . https://n2t.net/ark:/38305/f19c6wg4 Conditions Governing Access Collection is open for research. Conditions Governing Use Property rights for this collection reside with the University of California. Literary rights, including copyright, are retained by the creators and their heirs. The publication or use of any work protected by copyright beyond that allowed by fair use for research or educational purposes requires written permission from the copyright owner. Responsibility for obtaining permissions, and for any use rests exclusively with the user. Preferred Citation Lick Observatory Records: Photographs. UA36 Ser.7. Special Collections and Archives, University Library, University of California, Santa Cruz. Alternative Format Available Images from this collection are available through UCSC Library Digital Collections. Historical note These photographs were produced or collected by Lick observatory staff and faculty, as well as UCSC Library personnel. Many of the early photographs of the major instruments and Observatory buildings were taken by Henry E. Matthews, who served as secretary to the Lick Trust during the planning and construction of the Observatory.
  • Evidence for Crater Ejecta on Venus Tessera Terrain from Earth-Based Radar Images ⇑ Bruce A

    Evidence for Crater Ejecta on Venus Tessera Terrain from Earth-Based Radar Images ⇑ Bruce A

    Icarus 250 (2015) 123–130 Contents lists available at ScienceDirect Icarus journal homepage: www.elsevier.com/locate/icarus Evidence for crater ejecta on Venus tessera terrain from Earth-based radar images ⇑ Bruce A. Campbell a, , Donald B. Campbell b, Gareth A. Morgan a, Lynn M. Carter c, Michael C. Nolan d, John F. Chandler e a Smithsonian Institution, MRC 315, PO Box 37012, Washington, DC 20013-7012, United States b Cornell University, Department of Astronomy, Ithaca, NY 14853-6801, United States c NASA Goddard Space Flight Center, Mail Code 698, Greenbelt, MD 20771, United States d Arecibo Observatory, HC3 Box 53995, Arecibo 00612, Puerto Rico e Smithsonian Astrophysical Observatory, MS-63, 60 Garden St., Cambridge, MA 02138, United States article info abstract Article history: We combine Earth-based radar maps of Venus from the 1988 and 2012 inferior conjunctions, which had Received 12 June 2014 similar viewing geometries. Processing of both datasets with better image focusing and co-registration Revised 14 November 2014 techniques, and summing over multiple looks, yields maps with 1–2 km spatial resolution and improved Accepted 24 November 2014 signal to noise ratio, especially in the weaker same-sense circular (SC) polarization. The SC maps are Available online 5 December 2014 unique to Earth-based observations, and offer a different view of surface properties from orbital mapping using same-sense linear (HH or VV) polarization. Highland or tessera terrains on Venus, which may retain Keywords: a record of crustal differentiation and processes occurring prior to the loss of water, are of great interest Venus, surface for future spacecraft landings.
  • Adams Adkinson Aeschlimann Aisslinger Akkermann

    Adams Adkinson Aeschlimann Aisslinger Akkermann

    BUSCAPRONTA www.buscapronta.com ARQUIVO 27 DE PESQUISAS GENEALÓGICAS 189 PÁGINAS – MÉDIA DE 60.800 SOBRENOMES/OCORRÊNCIA Para pesquisar, utilize a ferramenta EDITAR/LOCALIZAR do WORD. A cada vez que você clicar ENTER e aparecer o sobrenome pesquisado GRIFADO (FUNDO PRETO) corresponderá um endereço Internet correspondente que foi pesquisado por nossa equipe. Ao solicitar seus endereços de acesso Internet, informe o SOBRENOME PESQUISADO, o número do ARQUIVO BUSCAPRONTA DIV ou BUSCAPRONTA GEN correspondente e o número de vezes em que encontrou o SOBRENOME PESQUISADO. Número eventualmente existente à direita do sobrenome (e na mesma linha) indica número de pessoas com aquele sobrenome cujas informações genealógicas são apresentadas. O valor de cada endereço Internet solicitado está em nosso site www.buscapronta.com . Para dados especificamente de registros gerais pesquise nos arquivos BUSCAPRONTA DIV. ATENÇÃO: Quando pesquisar em nossos arquivos, ao digitar o sobrenome procurado, faça- o, sempre que julgar necessário, COM E SEM os acentos agudo, grave, circunflexo, crase, til e trema. Sobrenomes com (ç) cedilha, digite também somente com (c) ou com dois esses (ss). Sobrenomes com dois esses (ss), digite com somente um esse (s) e com (ç). (ZZ) digite, também (Z) e vice-versa. (LL) digite, também (L) e vice-versa. Van Wolfgang – pesquise Wolfgang (faça o mesmo com outros complementos: Van der, De la etc) Sobrenomes compostos ( Mendes Caldeira) pesquise separadamente: MENDES e depois CALDEIRA. Tendo dificuldade com caracter Ø HAMMERSHØY – pesquise HAMMERSH HØJBJERG – pesquise JBJERG BUSCAPRONTA não reproduz dados genealógicos das pessoas, sendo necessário acessar os documentos Internet correspondentes para obter tais dados e informações. DESEJAMOS PLENO SUCESSO EM SUA PESQUISA.
  • Polygonal Impact Craters on Mercury G

    Polygonal Impact Craters on Mercury G

    43rd Lunar and Planetary Science Conference (2012) 1083.pdf POLYGONAL IMPACT CRATERS ON MERCURY G. T. Weihs1, J. J. Leitner1;2 and M. G. Firneis1;2, 1Institute of Astronomy, University of Vienna, Tuerkenschanzstrasse 17, A-1180 Vienna, Austria; 2Research Platform: ExoLife, University of Vienna, Austria; [email protected] Introduction: A polygonal impact crater (PIC) is a Table 1: List of PICs found on Mercury crater, which shape in plan view is more or less angular, and the rims are composed of several straight segments Quadr.Crater Diameter [km]Latitude [◦]Longitude [◦] [1]. Analyzing the images transmitted back to Earth by H01 Nizami 76.88 70.38 167.12 the spacecrafts Mariner 10 and MESSENGER, polyg- H01 Saikaku 64.06 71.89 178 onal impact craters with at least two straight rim seg- H01 Van Dijck 101.23 75.48 166.89 H02 Monteverdi 133.57 64.5 80.88 ments, were detected on Mercury. H02 Rubens 158.79 60.81 78.27 PICs on Mercury: The search for polygonal impact H02 Stravinsky 129.07 51.97 78.91 craters was carried out, using the database in [2]: In a H03 Verdi 144.55 64.25 169.62 H05 Hokusai 114.03 57.76 343.1 first step each of the 15 quadrangle-maps was optically H06 Al-jahiz 82.86 1.42 21.66 scanned for impact craters with at least two straight H06 Chaikovskij 171.02 7.9 50.87 rims. In a second step the data preparation was resulting H06 Hiroshige 138.42 -13.33 26.97 in a set of two images per PIC, one with marked straight H06 Kuiper 62.32 -11.32 31.4 H06 Lermontov 165.82 15.27 48.91 rims and an original one for the purpose of comparison.