THE ASTROPHYSICAL JOURNAL Founded in 1895 by George E. Hale and James E. Keeler HELMUT A. ABT Editor-in-Chief Kitt Peak National Observatory Scientific Editors GREGORY D. BOTHUN GEOFFREY BURBIDGE ANNE P. COWLEY BERNHARD M. HAISCH University of Oregon University of California, Arizona State University Solar and Astrophysics Lab., San Diego Lockheed Martin STEVEN M. SHORE EDWARD M. SION CHRISTOPHER SNEDEN YERVANT TERZIAN Indiana University, Villanova University University of Texas Cornell University South Bend JOHN H. THOMAS VIRGINIA TRIMBLE STEPHEN P. WILLNER EDWARD L. WRIGHT University of Rochester University of Maryland and Smithsonian Astrophysical University of California, University of California, Irvine Observatory Los Angeles A. DALGARNO EUGENE. H. AVRETT Letters Editor Deputy Letters Editor Center for Astrophysics Center for Astrophysics AAS PUBLICATIONS BOARD JAMES W. LIEBERT (1994-1996), Chairperson University of Arizona KRISTEN SELLGREN (1993-1996) JAMES J. CONDON (1994-1997) JOHN A. NOUSEK (1994-1997) Ohio State University NRAO, Charlottesville, Virginia Pennsylvania State University HUGH M. VAN HORN (1995-1998) MOSHE ELITZUR (1995-1998) DIMITRI M. MIHALAS (1996-1999) National Science Foundation University of Kentucky University of Illinois Production Manager: Kim LANGFORD Publication Manager : JULIE STEFFEN Chief Manuscript Editor: GERALDINE BRADY Manuscript Editors: WaLTeR G. Giascorr III, BETH GARRISON, KAREN LesLig Boyp, THAD A. Doria, Grec M. Hasex, Paut Ruicu, JoHN Myer, EvizaBeTH P. MCNULTY, AND Davip B. WITONSKY Electronic Publishing Coordinator: Rick SCHOEN Production Staff: Cinpy GARRETT, CAROLYN CHMIEL, KELLY PATRICK CRONIN, AND SARA ZIMMERMAN Tucson Editorial Office: JANICE SEXTON, ALICE PROCHNOW, CANDACE M. Hauser, PATRICIA CONROY, AND MARLENE SALTZMAN VOLUME 460, PART 1 1996 MARCH 20 AND APRIL 1 PUBLISHED BY THE UNIVERSITY OF CHICAGO PRESS FOR THE AMERICAN ASTRONOMICAL SOCIETY © 1996 BY THE AMERICAN ASTRONOMICAL SOCIETY. ALL RIGHTS RESERVED. PUBLISHED THREE TIMES A MONTH COMPOSED BY SANTYPE INTERNATIONAL LIMITED, SALISBURY, ENGLAND PRINTED BY CAPITAL CITY PRESS, INC. MONTPELIER, VERMONT, U.S.A. THE ASTROPHYSICAL JOURNAL CONTENTS OF VOLUME 460, PART 1 1996 MARCH 20, Number 1 HIGH-LATITUDE GALACTIC EMISSION IN THE COBE DIFFERENTIAL MICROWAVE RADIOMETER 2 YEAR SKY MAPS A. Kogut, A. J. Banday, C. L. Bennett, K. M. Gorski, G. Hinshaw, & W. T. Reach THE BARYON FRACTION AND VELOCITY-TEMPERATURE RELATION IN GALAXY CLUSTERS: MODELS VERSUS OBSERVATIONS Lori M. Lubin, Renyue Cen, Neta A. Bahcall, & Jeremiah P. Ostriker THE THERMODYNAMIC DESCRIPTION OF THE COSMOLOGICAL MANY-BODY PROBLEM William C. Saslaw & Fan Fang PERTURBATIVE GROWTH OF COSMOLOGICAL CLUSTERING. II. THE TWO-POINT CORRELATION Somnath Bharadwaj NONLINEAR EVOLUTION OF GENUS IN A PRIMORDIAL RANDOM GAUSSIAN DENSITY FIELD Takahiko Matsubara & Yasushi Suto GENERATION OF CORRELATED AND CONSTRAINED GAUSSIAN STOCHASTIC PROCESSES FOR N-BODY SIMULATIONS John Salmon A PANORAMIC VIEW OF RADIO GALAXY EVOLUTION FROM A REDSHIFT OF 0 TO A REDSHIFT OF 4.3 Stephen A. Eales & Steve Rawlings STRONG ANGULAR CLUSTERING OF VERY BLUE GALAXIES: EVIDENCE OF A LOW-REDSHIFT POPULATION Stephen D. Landy, Alexander S. Szalay, & David C. Koo GLOBAL PROPERTIES OF MULTIPLE MERGER REMNANTS Melinda L. Weil & Lars Hernquist QUANTIFYING THE FRAGILITY OF GALACTIC DISKS IN MINOR MERGERS lan R. Walker, J. Christopher Mihos, & Lars Hernquist TRIAXIAL GALAXIES WITH CUSPS David Merritt & Tema Fridman INDUCED COMPTON BACKSCATTERING IN RADIO PULSARS AND RADIO-LOUD ACTIVE GALACTIC NUCLEI Mark W. Sincell & Paolo S. Coppi PARSEC-SCALE RADIO STRUCTURE OF FOUR X-RAY-SELECTED BL LACERTAE OBJECTS R. I. Kollgaard, D. C. Gabuzda, & E. D. Feigelson GENERAL AXISYMMETRIC MAGNETOHYDRODYNAMIC FLOWS: THEORY AND SOLUTIONS John Contopoulos RESISTIVE MAGNETOHYDRODYNAMIC ACCRETION DISKS AROUND BLACK HOLES Takahiro Kudoh & Osamu Kaburaki OJ 287 OUTBURST STRUCTURE AND A BINARY BLACK HOLE MODEL Harry J. Lehto & Mauri J. Valtonen THE NUCLEAR DISK OF NGC 4261: HUBBLE SPACE TELESCOPE IMAGES AND GROUND-BASED SPECTRA Walter Jaffe, Holland Ford, Laura Ferrarese, Frank van den Bosch, & Robert W. O'Connell VLA OBSERVATIONS OF ULTRALUMINOUS IRAS GALAXIES: ACTIVE NUCLEI OR STARBURSTS? Thomas Crawford, Jonathan Marr, Bruce Partridge, & Michael A. Strauss MAGNETICALLY UPLIFTED CLUMPS IN COOLING FLOW CLUSTERS Essam Zoabi, Noam Soker, & Oded Regev NUCLEAR RINGS IN ACTIVE GALAXIES Thaisa Storchi-Bergmann, Andrew S. Wilson, & Jack A. Baldwin MOLECULAR GAS IN ELLIPTICAL GALAXIES: CO OBSERVATIONS OF AN IRAS FLUX-LIMITED SAMPLE G. R. Knapp& M. P. Rupen CONTENTS THE O/H DISTRIBUTION IN THE LOW-MASS GALAXIES NGC 2366 AND NGC 4395 Jean-René Roy, Julien Belley, Yvan Dutil, & Pierre Martin DIFFUSE GAMMA-RAY EMISSION FROM THE STARBURST GALAXY NGC 253 Timothy A. D. Paglione, Alan P. Marscher, James M. Jackson, & David L. Bertsch SPECTRUM OF THE SUPERNOVA RELIC NEUTRINO BACKGROUND AND EVOLUTION OF GALAXIES Tomonori T otani, Katsuhiko Sato, & Yuzuru Yos hii ASTRO-2 OBSERVATIONS OF INTERSTELLAR DUST AND GAS IN THE LARGE MAGELLANIC CLOUD Geoffrey C. Clayton, J. Green, Michael J. Wolff, Nicolle E. B. Zellner, A. D. Code, Arthur F. Davidsen, The WU PPE Science Team, & The HUT Science Team HUBBLE SPACE TELESCOPE OBSERVATIONS OF PLANETARY NEBULAE IN THE MAGELLANIC CLOUDS. IV. [0 m] IMAGES AND EVOLUTIONARY AGES M. A. Dopita, E. Vassiliadis, S. J.M eatheringham, R. C. Bohlin, H. C. Ford, J. P. Harrington, P. R. Wood, T. P. Stecher, & S. P. Maran CO (J = 2-1) LINE OBSERVATIONS OF THE GALACTIC CENTER MOLECULAR CLOUD COMPLEX. I. ON-PLANE STRUCTURE Tomoharu Oka, Tetsuo Hasegawa, Toshihiro Handa, Masahiko Hayashi, & Seiichi Sakamoto DENSITY STRUCTURE IN GIANT MOLECULAR CLOUD CORES E. A. Bergin, R. L. Snell, & P. F. Goldsmith MASSIVE STAR FORMATION IN THE HOT, DENSE CLOUD CORE OF G9.62+0.19 P. Hofner, S. Kurtz, E. Churchwell, C. M. Walmsley, & R. Cesaroni EXCITATION OF [Niu] AND [Fe n] LINES IN GASEOUS NEBULAE Manuel A. Bautista, Jianfang Peng, & Anil K. Pradhan SPONTANEOUS SYMMETRY BREAKING OF RAPIDLY ROTATING STARS IN GENERAL RELATIVITY Silvano Bonazzola, Joachim Frieben, & Eric Gourgoulhon LIMITS ON LONG-RANGE FIELDS DERIVED FROM BINARY RADIO PULSARS Itzhak Goldman & Tamar Kustanovich ORBITAL SEPARATIONS OF WHITE DWARF-RED DWARF BINARIES Greg Schultz, B. Zuckerman, & E. E. Becklin CORE-COLLAPSE SUPERNOVAE AND THEIR EJECTA Friedrich-Karl Thielemann, Ken’ichi Nomoto, & Masa-aki Hashimoto AN UPPER LIMIT TO THE MASS OF THE BLACK HOLE IN V404 CYGNI D. Sanwal, E. L. Robinson, E. Zhang, C.Colome, P. M. Harvey, T. F. Ramseyer, Coel Hellier, & Janet H. Wood CLUES FOR LITHIUM PRODUCTION IN GALACTIC C STARS: THE '7C/!*C RATIO C. Abia & J. Isern A SEARCH FOR PULSATIONS IN FOUR LATE-TYPE GIANTS Scott Horner REFRACTIVE AND DIFFRACTIVE SCINTILLATION OF THE PULSAR PSR B0329+54 Daniel R. Stinebring, Michael D. Faison, & Mark M. McKinnon PULSE FREQUENCY CHANGES OF IE 2259+586 AND THE BINARY INTERPRETATION Altan Baykal & Jean Swank PRODUCTION OF THE LIGHT p-PROCESS NUCLEI IN NEUTRINO-DRIVEN WINDS R. D. Hoffman, S. E. Woosley, G. M. Fuller, & B.S. Meyer ON THE EVOLUTION OF STARS THAT FORM ELECTRON-DEGENERATE CORES PROCESSED BY CARBON BURNING. II. ISOTOPE ABUNDANCES AND THERMAL PULSES IN A 10 M, MODEL WITH AN ONe CORE AND APPLICATIONS TO LONG-PERIOD VARIABLES, CLASSICAL NOVAE, AND ACCRETION-INDUCED COLLAPSE Claudio Ritossa, Enrique Garcia-Berro, & Icko Iben, Jr. EVIDENCE FOR WIND ATTENUATION AND A MULTITEMPERATURE PLASMA IN THE COMBINED EUVE AND ROSAT OBSERVATIONS OF ¢ CANIS MAJORIS (B2 II) D. H. Cohen, R. G. Cooper, J. J.M acFarlane, S. P. Owocki, J. P. Cassinelli, & P. Wang SOLAR ACTIVE REGIONS AS A PERCOLATION PHENOMENON. IL. Philip E. Seiden & Donat G. Wentzel A MODEL FOR DEXTRAL AND SINISTRAL PROMINENCES E. R. Priest, A. A. van Ballegooijen, & D. H.M acKay CONTENTS ABSTRACTS OF THE ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES, 1996 APRIL A MEDIUM-DEEP SURVEY OF A MINISLICE AT THE NorTH GALACTIC Po e. II. THE DATA C. N. A. Willmer, David C. Koo, Nancy Ellman, Michael, J. Kurtz, & Alex S. Szalay RADIO PROPERTIES AND OPTICAL IDENTIFICATION OF TWO SAMPLES OF MILLIJANSKY RADIO Sources AT 1.4 GHz Nanyao Y. Lu, G. Lyle Hoffman, Edwin E. Salpeter, & James R. Houck ADAPTIVE SMOOTHED PARTICLE HYDRODYNAMICS, WITH APPLICATION TO COSMOLOGY: METHODOLOGY Paul R. Shapiro, Hugo Martel, Jens V. Villumsen, & J. Michael Owen COMPARATIVE ANALYSIS OF THE HIGH- AND Low-IONIZATION LINES IN THE BROAD-LINE REGION OF ACTIVE GALACTIC NUCLEI P. Marziani, J. W. Sulentic, D. Dultzin-Hacyan, M. Calvani, & M. Moles Deep r-BAND PHOTOMETRY FOR NORTHERN SPIRAL GALAXIES Stéphane Courteau Tue GB6 CaTALOG oF RADIO SOURCES P. C. Gregory, W. K. Scott, K. Douglas, & J. J.C ondon DISTANCE CONSTRAINTS TO THE ANTICENTER HIGH-VELOCITY CLOUDS Christopher M. Tamanaha A CATALOG OF CANDIDATE FIELD HOoRIZONTAL-BRANCH AND A-TyPE Stars. II. Timothy C. Beers, Ronald Wilhelm, Stephen P. Doinidis, & Caroline J. Mattson ATOMIC DaTA FOR ASTROPHYSICS. I. RADIATIVE RECOMBINATION RATES FOR H-LIKE, He-LIKE, AND Na-LIKE IONS OVER A BROAD RANGE OF TEMPERATURE D. A. Verner & G. J. Ferland 1996 APRIL 1, Number 2 REES-SCIAMA EFFECT IN A COLD DARK MATTER UNIVERSE Uros Seljak THE ROLE OF HYDROGEN MOLECULES IN THE RADIATIVE COOLING AND FRAGMENTATION OF COSMOLOGICAL SHEETS Peter Anninos & Michael L. Norman RECONSTRUCTING POSITIONS AND PECULIAR VELOCITIES OF GALAXY CLUSTERS WITHIN 25,000 KILOMETERS PER SECOND: THE CLUSTER REAL SPACE DIPOLE Enzo Branchini & Manolis Plionis THE COSMOLOGICAL DENSITY AND IONIZATION OF HOT GAS: O vi ABSORPTION IN QUASAR SPECTRA Scott Burles & David Tytler SPECTRAL AND SPATIAL ANALYSIS OF THE INTRAGROUP MEDIUM IN THE NGC 2300 GROUP David S. Davis, John, S. Mulchaey, Richard F. Mushotzky, & David Burstein THE STATISTICS AND AGES OF COMPACT SYMMETRIC OBJECTS A. C. 8. Readhead, G. B. Taylor, W. Xu, T. J. Pearson, P. N. Wilkinson, & A. G. Polatidis COMPACT SYMMETRIC OBJECTS AND THE EVOLUTION OF POWERFUL EXTRAGALACTIC RADIO SOURCES A. C. 8. Readhead, G. B. Taylor, T. J. Pearson, & P. N. Wilkinson VERY HIGH ENERGY GAMMA-RAY EMISSION FROM THE BLAZAR MARKARIAN 421 M. S. Schubnell, C. W. Akerlof, S. Biller, J.B uckley, D. A. Carter-Lewis, M. F. Cawley, M. Chantell, V. Connaughton, D. J. Fegan, S. Fennell, J. A. Gaidos, A. M. Hillas, A. D. Kerrick, R. C. Lamb, D. I. Meyer, G. Mohanty, J. Rose, A. C. Rovero, G. Sembroski, T. C. Weekes, C. Wilson, & J. Zweerink TRACING THE DYNAMICS OF DISK GALAXIES WITH OPTICAL AND INFRARED SURFACE PHOTOMETRY: COLOR GRADIENTS IN M99 Rosa A. Gonzalez & James R. Graham NEUTRAL HYDROGEN IN THE RINGED BARRED GALAXIES NGC 1433 AND NGC 6300 Stuart D. Ryder, Ronald J. Buta, Hector Toledo, Hemant Shukla, Lister Staveley-Smith, & Wilfred Walsh THE NEUTRAL HYDROGEN DISK OF ARP 10 (=VV 362): A NONEQUILIBRIUM DISK ASSOCIATED WITH A GALAXY WITH RINGS AND RIPPLES V. Charmandaris & P. N. Appleton FAR-INFRARED RADIATION FROM DUST HEATED BY THE INTERSTELLAR RADIATION FIELD IN SPIRAL GALAXIES Rene A. M. Walterbos & Bruce Greenawalt HIGH-RESOLUTION OBSERVATIONS OF THE NGC 2024 OUTFLOWS Lawrence M. Chernin CONTENTS WSRT AND VLA OBSERVATIONS OF THE 6 CENTIMETER AND 2 CENTIMETER LINES OF H,CO IN THE DIRECTION OF W3 Helene R. Dickel, W. Miller Goss, & G. R. Condon OSSE DETECTION OF GAMMA RAYS FROM THE VELA SYNCHROTRON NEBULA Ocker C. de Jager, Alice K. Harding, & Mark S. Strickman OSSE OBSERVATIONS OF THE VELA AND GEMINGA PULSARS M. S. Strickman, J. E. Grove, W. N. Johnson, R. I. Kinzer, R. A. Kroeger, J. D. Kurfess, D. A. Grabelsky, S. M. Matz, W. R. Purcell, M. P. Ullmer, & G. V. Jung A NEAR-INFRARED STUDY OF THE K3-50 REGION OF HIGH-MASS STAR FORMATION Eric M. Howard, Judith L. Pipher, William J. Forrest, & C. G. De Pree ON THE IMPLICATIONS OF THE nTH-ORDER VIRIAL EQUATIONS FOR HETEROGENEOUS AND CONCENTRIC JACOBI, DEDEKIND, AND RIEMANN ELLIPSOIDS Simonetta Filippi, Remo Ruffini, & Alonso Sepulveda THE MAGNETOHYDRODYNAMIC KELVIN-HELMHOLTZ INSTABILITY: A TWO-DIMENSIONAL NUMERICAL STUDY Adam Frank, T. W. Jones, Dongsu Ryu, & Joseph B. Gaalaas THE FLASH PHASE OF CHARGED PARTICLE PROPAGATION IN RANDOM MAGNETIC FIELDS James A. Earl THE DYNAMICS AND OUTCOMES OF RAPID INFALL ONTO NEUTRON STARS Chris L. Fryer, Willy Benz, & Marc Herant OCEAN g-MODES ON ROTATING NEUTRON STARS Lars Bildsten, Greg Ushomirsky, & Curt Cutler GAP FORMATION IN PROTOPLANETARY DISKS Taku Takeuchi, Shoken M. Miyama, & D. N.C. Lin A DYNAMO INTERPRETATION OF STELLAR ACTIVITY CYCLES S. L. Baliunas, E. Nesme-Ribes, D. Sokoloff, & W. H. Soon NONLINEAR GENERATION OF ONE-ARMED SPIRALS IN SELF-GRAVITATING DISKS Gregory Laughlin & Vladimir Korchagin SILICON BURNING. I. NEUTRONIZATION AND THE PHYSICS OF QUASI-EQUILIBRIUM W. Raphael Hix & Friedrich-Karl Thielemann EFFECTS OF NEUTRINO-ELECTRON SCATTERING ON NEUTRINO TRANSPORT IN TYPE II SUPERNOVAE J. Martijn Smit, Jan Cernohorsky, Leo J. van den Horn, & Christiaan G. van Weert SEARCH FOR PROTOPLANETARY AND DEBRIS DISKS AROUND MILLISECOND PULSARS R. S. Foster & J. Fischer TWO-DIMENSIONAL ULTRAVIOLET SPECTRAL TYPING OF O-TYPE STARS Laura R. Penny, Douglas R. Gies, & William G. Bagnuolo, Jr. THE LYMAN-CONTINUUM FLUXES AND STELLAR PARAMETERS OF O AND EARLY B-TYPE STARS William D. Vacca, Catharine D. Garmany, & J. Michael Shull OBSERVATIONS OF THE X-RAY NOVA GRO J0422+32. Il. OPTICAL SPECTRA APPROACHING QUIESCENCE Michael R. Garcia, Paul J. Callanan, Jeffrey E. McClintock, & Ping Zhao IUE AND OPTICAL OBSERVATIONS OF AM HERCULIS IN ITS LOW STATE A. D. Silber, J.C. Raymond, P. A. Mason, I. L. Andronov, N. V. Borisov, & N. M. Shakhovskoy EUVE SPECTROSCOPY OF £ CANIS MAJORIS (B1 II-III) FROM 500 A TO 700 A J. P. Cassinelli, D.H . Cohen, J. J.M acFarlane, J. E. Drew, A. E. Lynas-Gray, 1. Hubeny, J. V. Vallerga, B. Y. Welsh, & M. G. Hoare THE 1979 MARCH 5 GAMMA-RAY TRANSIENT: WAS IT A CLASSIC GAMMA-RAY BURST? E. E. Fenimore, R. W. Klebesadel, & J. G. Laros THE RADIO PROPERTIES OF THE dMe FLARE STAR PROXIMA CENTAURI Jeremy Lim, Stephen M. White, & O. B. Slee THE AGE-RELATED PROPERTIES OF THE HD 98800 SYSTEM David R. Soderblom, Todd J. Henry, Matthew D. Shetrone, Burton F. Jones, & Steven H. Saar A THEORY OF EXTRASOLAR GIANT PLANETS D. Saumon, W. B. Hubbard, A. Burrows, T. Guillot, J. 1. Lunine, & G. Chabrier SMALL-SCALE HORIZONTAL MAGNETIC FIELDS IN THE SOLAR PHOTOSPHERE B. W. Lites, K. D. Leka, A. Skumanich, V. Martinez Pilet, & T. Shimizu CONTENTS DOPPLER MEASUREMENTS OF THE SUN’S MERIDIONAL FLOW David H. Hathaway ELECTRON TEMPERATURE, EMISSION MEASURE, AND X-RAY FLUX IN A2 TO X2 X-RAY CLASS SOLAR FLARES U. Feldman, G. A. Doschek, W. E. Behring, & K. J. H. Phillips OBSERVATIONS OF SOLAR CARBON MONOXIDE WITH AN IMAGING INFRARED SPECTROGRAPH. I. THERMAL BIFURCATION REVISITED Thomas R. Ayres & Douglas Rabin THE SUN’S HYDROSTATIC STRUCTURE FROM LOWL DATA Sarbani Basu, J. Christensen-Dalsgaard, J. Schou, M. J. Thompson, & S. Tomczyk ERRATUM THE COBE NORMALIZATION OF CMB ANISOTROPIES Martin White & Emory Bunn INSTRUCTIONS TO AUTHORS