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THE ASTROPHYSICAL JOURNAL Supplement Series Founded in 1895 by George E. Hale and James E. Keeler ROBERT C. KENNICUTT, JR. A. DALGARNO Editor-in-Chief Letters Editor Steward Observatory Harvard-Smithsonian University of Arizona Center for Astrophysics JAMES W. LIEBERT EUGENE H. AVRETT Associate Editor-in-Chief Deputy Letters Editor Steward Observatory Harvard-Smithsonian University of Arizona Center for Astrophysics Scientific Editors GREGORY D. BOTHUN GEOFFREY BURBIDGE BERNARD M. HAISCH ERIC HERBST JOHN P. HUCHRA University of Oregon University of California, California Institute for Ohio State University Harvard-Smithsonian San Diego Physics and Astrophysics Center for Astrophysics Palo Alto JOHN T. MARISKA FULVIO MELIA STEVEN N. SHORE EDWARD M. SION CHRISTOPHER SNEDEN Naval Research University of Arizona Indiana University Villanova University University of Texas Laboratory South Bend F. W. STECKER JOHN H. THOMAS ETHAN T. VISHNIAC STEVEN P. WILLNER NASA/Goddard Space University of Rochester Johns Hopkins University Smithsonian Astrophysical Flight Center Observatory AAS PUBLICATIONS BOARD BRUCE G. ELMEGREEN (1999-2002), Chairperson IBM TJ Watson Research Center SUSAN TEREBEY (1997-2000) ALYSSA A. GOODMAN (1998-2001) JOEL E. TOHLINE (1999-2001) Extrasolar Research Corporation Harvard University Louisiana State University RONALD E. TAAM (1999-2002) JEAN TURNER (2000-2003) RAYMOND CARLBERG (2000-2003) Northwestern University University of California, Los Angeles University of Toronto Publication Manager: JULIE STEFFEN Production Manager: CAROLYN CHMIEL Chief Manuscript Editor: GERALDINE BRADY Manuscript Editors: WALTER G. GLascorF III, BETH GARRISON, THAD A. Doria, PAUL RUICH, SHARON JENNINGS, ELIZABETH HUYCK, Eric SHUTT, KATHRYN KRAYNIK, RACHEL L. DRZEWICKI, ROCHELLE COHEN LODDER, NORA HOSTETLER, JEREMY HORSEFIELD, KERRY TUPPER, BENJAMIN D. STONE, KEVIN S. BECK, AND ALISON COMPTON Production Staff: CinDy GARRETT, TIMOTHY HARPER, CECILIA HILGEMAN, ANJELICA SLOAN, MIKKI SMITH, LYVETTE MARSH, ASHLEY TOWNE, GREG GILLAM, URMI BHOWMIK, AND JAMES CAVICCHIA Tucson Editorial Office: JANICE SEXTON, CANDACE M. HAUSER, AND GREGORY SCHWARZ VOLUME 130 2000 SEPTEMBER AND OCTOBER PUBLISHED BY THE UNIVERSITY OF CHICAGO PRESS FOR THE AMERICAN ASTRONOMICAL SOCIETY © 2000 BY THE AMERICAN ASTRONOMICAL SOCIETY. ALL RIGHTS RESERVED. PUBLISHED MONTHLY COMPOSED BY SANTYPE INTERNATIONAL LIMITED, SALISBURY, ENGLAND PRINTED BY THE MACK PRINTING GROUP EASTON, PENNSYLVANIA, U.S.A. THE ASTROPHYSICAL JOURNAL CONTENTS OF VOLUME 130 2000 SEPTEMBER, NUMBER 1 DISCOVERY OF DAMPED Lya SYSTEMS AT REDSHIFTS LESS THAN 1.65 AND RESULTS ON THEIR INCIDENCE AND COSMOLOGICAL MASS DENSITY Sandhya M. Rao & David A. Turnshek A UNIFORM ANALYSIS OF THE Lya FOREST AT z = 0-5. I. THE SAMPLE AND DISTRIBUTION OF CLOUDS AT z > 1.7 Jennifer Scott, Jill Bechtold, & Adam Dobrzycki A UNIFORM ANALYSIS OF THE Lya FOREST AT z = 0-5. Il. MEASURING THE MEAN INTENSITY OF THE EXTRAGALACTIC IONIZING BACKGROUND USING THE PROXIMITY EFFECT Jennifer Scott, Jill Bechtold, Adam Dobrzycki, & Varsha P. Kulkarni LOW- AND HIGH-IONIZATION ABSORPTION PROPERTIES OF Mg 1 ABSORPTION-SELECTED GALAXIES AT INTERMEDIATE REDSHIFTS. I. GENERAL PROPERTIES Christopher W. Churchill, Richard R. Mellon, Jane C. Charlton, Buell T. Jannuzi, Sofia Kirhakos, Charles C. Steidel, & Donald P. Schneider THE LOCAL Lya FOREST. I. OBSERVATIONS WITH THE GHRS/Gi60M ON THE HUBBLE SPACE TELESCOPE Steven V. Penton, John T. Stocke, & J. Michael Shull COMPARISON STAR SEQUENCES FOR OPTICAL PHOTOMETRY OF ACTIVE GALACTIC NUCLEI AND QUASARS Wayne Webb & Matthew Malkan THE ARECIBO DUAL-BEAM SURVEY: ARECIBO AND VLA OBSERVATIONS Jessica L. Rosenberg & Stephen E. Schneider PHOTOMETRIC VARIABILITY IN A SAMPLE OF 187 G AND K GIANTS Gregory W. Henry, Francis C. Fekel, Stephen M. Henry, & Douglas S. Hall FINE-STRUCTURE CALCULATION OF ENERGY LEVELS, OSCILLATOR STRENGTHS, AND LIFETIMES IN Al-LIKE SULFUR G. P. Gupta & A. Z. Msezane 2000 OCTOBER, NUMBER 2 LOOSE GROUPS OF GALAXIES IN THE LAS CAMPANAS REDSHIFT SURVEY Douglas L. Tucker, Augustus Oemler, Jr., Yasuhiro Hashimoto, Stephen A. Shectman, Robert P. Kirshner, Huan Lin, Stephen D. Landy, Paul L. Schechter, & Sahar S. Allam NUCLEAR GAS AND DUST DISK IN NEARBY 3CR ELLIPTICAL GALAXIES André R. Martel, Neal J. Turner, William B. Sparks, & Stefi A. Baum OSCILLATING NEUTRINOS FROM THE GALACTIC CENTER Roland M. Crocker, Fulvio Melia, & Raymond R. Volkas SiO MASER SURVEY OF THE GALACTIC DISK IRAS SOURCES. III. —10° <1 < 15° AND |b| < 3°, A CENTRAL PART OF THE GALAXY Shuji Deguchi, Takahiro Fujii, Hideyuki Izumiura, Osamu Kameya, Yoshikazu Nakada, & Jun-ichi Nakashima EMBEDDED STELLAR CLUSTERS IN THE W3/W4/W5 MOLECULAR CLOUD COMPLEX John M. Carpenter, Mark H. Heyer, & Ronald L. Snell ATOMIC DATA FOR RESONANCE ABSORPTION LINES. Il. WAVELENGTHS LONGWARD OF THE LYMAN LIMIT FOR HEAVY ELEMENTS Donald C. Morton MID-INFRARED IMAGING OF STAR-FORMING REGIONS CONTAINING METHANOL MASERS James M. De Buizer, Robert K. Pina, & Charles M. Telesco ill CONTENTS TWO-DIMENSIONAL MODELS OF HYDRODYNAMICAL ACCRETION FLOWS INTO BLACK HOLES Igor V. Igumenshchev & Marek A. Abramowicz SOFT X-RAY AND GYRORESONANCE EMISSION ABOVE SUNSPOTS A. Nindos, M. R. Kundu, 8. M. White, K. Shibasaki, & N. Gopalswamy INDEX