Table Of Content

THE ASTROPHYSICAL JOURNAL Founded in 1895 by George E. Hale and James E. Keeler HELMUT A. ABT Managing Editor Kitt Peak National Observatory A. DALGARNO EUGENE H. AVRETT Letters Editor Deputy Letters Editor Center for Astrophysics Center for Astrophysics F. DAVID A. HARTWICK MICHAEL JURA EDWIN E. SALPETER Associate Letters Editor Associate Letters Editor Associate Letters Editor University of Victoria University of California, Los Angeles Cornell University AAS PUBLICATIONS BOARD HUGH M. VAN HORN (1993-1996), Chairperson University of Rochester JAMES W. LIEBERT (1991-1994) KRISTEN SELLGREN (1991-1994) H. J. G. L.M . LAMERS (1992-1995) University of Arizona Ohio State University SRON Laboratory for Space Research, The Netherlands SUSAN G. KLEINMANN (1993-1995) JAMES J. CONDON (1994-1997) JOHN A. NOUSEK (1994-1997) University of Massachusetts NRAO, Charlottesville, Virginia Pennsylvania State University Production Manager: TuLIE O’CONNOR Chief Manuscript Editor: GERALDINE BRADY Manuscript Editors: WALTER G. GLAscorFF III, BETH GARRISON, KAREN LESLIE Boyp, THAD A. Doria, Davip E. ANDERSON, AND IVAN BRUNETTI Production Staff; Kim LANGFORD, GRACE S. WHITE, CINDY GARRETT, RICK SCHOEN, AND CAROLYN B. CHMIEL Cambridge Editorial Office: MARY BURGESS, KATHRYN DUFLO, AND CHRISTOPHER VETTEL VOLUME 422, PART 2 1994 FEBRUARY 10 AND FEBRUARY 20 PUBLISHED BY THE UNIVERSITY OF CHICAGO PRESS FOR THE AMERICAN ASTRONOMICAL SOCIETY © 1994 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 LETTERS CONTENTS OF VOLUME 422, PART 2 1994 FEBRUARY 10, Number 1 Q FROM VELOCITIES IN VOIDS Avishai Dekel & Martin J. Rees IMAGING OF 16 DISTANT EMSS CLUSTERS WITH z 2 0.2 AND Lx4 4 2 4: NEW ARCS AND FIRST CONSEQUENCES O. Le Fevre, F. Hammer, M. C. Angonin, I. M. Gioia, & G. A. Luppino THE VELOCITY DISPERSION OF GLOBULAR CLUSTERS IN NGC 1399 Carl J. Grillmair, K. C. Freeman, G. V. Bicknell, D. Carter, Warrick J. Couch, J. Sommer-Larsen, & K. Taylor NEUTRAL HYDROGEN ABSORPTION IN NGC 1068 AND NGC 3079 J. F. Gallimore, S. A. Baum, C. P. O’Dea, E. Brinks, & A. Pedlar SECULAR VARIATIONS OF THE INTEGRATED PULSE PROFILE OF, AND TORQUE ON, PSR 2217+ 47: PRECESSION OF THE NEUTRON STAR? Svetlana A. Suleymanova & Yurii PR. Shitov IMAGING POLARIMETRY OF HL TAURI AND GG TAURI: A GEOMETRICALLY THIN DISK AROUND GG TAURI Takuya Yamashita, Klaus-W. Hodapp, & Toby J. T. Moore IMPULSIVE BEHAVIOR IN SOLAR SOFT X-RADIATION H. S. Hudson, K. T. Strong, B. R. Dennis, D. Zarro, M. Inda, T. Kosugi, & T. Sakao LIMITS ON CORONAL REFLECTION USING HIGH-FREQUENCY SOLAR OSCILLATIONS P. Kumar, M. A. Fardal, S. M. Jefferies, T. L. Duvall, Jr, J. W. Harvey, & M. A. Pomerantz INSTRUCTIONS TO AUTHORS OF LETTERS, RECENT LETTERS ABSTRACTS, AUTHOR AND SUBJECT INDEXES Inside Back Cover 1994 FEBRUARY 20, Number 2 DEGREE-SCALE OBSERVATIONS OF COSMIC MICROWAVE BACKGROUND ANISOTROPIES P. de Bernardis, E. Aquilini, A. Boscaleri, M. De Petris, G. DAndreta, M. Gervasi, E. Kreysa, L. Martinis, S. Masi, PR. Palumbo, & F. Scaramuzzi A MEASUREMENT OF THE MEDIUM-SCALE ANISOTROPY IN THE COSMIC MICROWAVE BACKGROUND RADIATION E. S. Cheng, D. A. Cottingham, D. J. Fixsen, C. A. Inman, M. S. Kowitt, S. S. Meyer, L. A. Page, J. L. Puchalla, & R. F. Silverberg COSMIC MICROWAVE BACKGROUND ANISOTROPIES IN COLD DARK MATTER MODELS WITH COSMOLOGICAL CONSTANT: THE INTERMEDIATE VERSUS LARGE ANGULAR SCALES Radostaw Stomper & Krzysztof M. Gorski GALAXY GROUPS IN COLD + HOT DARK MATTER AND COLD DARK MATTER UNIVERSES: COMPARISON WITH CfA DATA Richard Nolthenius, Anatoly Klypin, & Joel R. Primack DECAYING NEUTRINOS AND THE ABUNDANCE OF He1 IN LYMAN LIMIT SYSTEMS AND LYMAN-ALPHA CLOUDS D. W. Sciama CONTENTS THE “DROP-OFF” FREQUENCY IN THE X-RAY VARIABILITY POWER SPECTRUM OF ACTIVE GALACTIC NUCLEI: A POSSIBLE CHARACTERISTIC TIMESCALE IN X-RAY EMISSION OF NGC 4051 G. Bao & E. @stgaard EXTREME ULTRAVIOLET SPECTROSCOPY OF PKS 2155-304 Antonella Fruscione, Stuart Bowyer, Arieh Konigl, & Steven M. Kahn BATSE OBSERVATIONS OF THE VERY INTENSE GAMMA-RAY BURST GRB 930131 Chryssa Kouveliotou, Robert Preece, Narayana Bhat, Gerald J. Fishman, Charles A. Meegan, John M. Horack, Michael S. Briggs, William S. Paciesas, Geoffrey N. Pendleton, David Band, Jim Matteson, David Palmer, Bonnard Teegarden & Jay P. Norris HIGH-ENERGY GAMMA RAYS FROM THE INTENSE 1993 JANUARY 31 GAMMA-RAY BURST M. Sommer, D. L. Bertsch, B. L. Dingus, C. E. Fichtel, G. J. Fishman, A. K. Harding, R. C. Hartman, S. D. Hunter, K. Hurley, G. Kanbach, D. A. Kniffen, C. Kouveliotou, Y. C. Lin, J. R. Mattox, H. A. Mayer-Hasselwander, P. F- Michelson, C. von Montigny, P. L. Nolan, E. Schneid, P. Sreekumar, & D. J. Thompson COMPTEL MEASUREMENTS OF THE GAMMA-RAY BURST GRB 930131 J. Ryan, K. Bennett, W. Collmar, A. Connors, G. J. Fishman, J. Greiner, L. O. Hanlon, W. Hermsen, R. M. Kippen, C. Kouveliotou, L. Kuiper, G. Lichti, J. Macri, J. Mattox, M. McConnell, B. McNamara, C. Meegan, V. Schénfelder, R. van Dijk, M. Varendorff, W. R. Webber, & C. Winkler RAPID SEARCHES FOR COUNTERPARTS OF GRB 930131 Bradley E. Schaefer, Scott D. Barthelmy, David M. Palmer, Thomas L. Cline, Kevin C. Hurley, Michael Sommer, Michel Boer, Michel Niel, Gerald J. Fishman, Chryssa Kouveliotou, Charles A. Meegan, M. J. Coe, Bruce G. Elmegreen, Bernard J. McNamara, Thomas Harrison, Alan Owens, Neyle Sollee, John Stull, Michael Palermiti, Richard Schwartz, Jack Brooks, Roland Vanderspek, George R. Ricker, Hans A. Krimm, Wolfgang Wenzel, Jochen Greiner, Rene Hudec, Miroslav Novak, Jiri Borovicka, Miroslav Predota, Charles D. Bailyn, Lorraine O. Hanlon, K. Bennett, Titus A. Th. Spoelstra, Alain Smette, Holger Pedersen, Ralph Florentin, Christian Pollas, Helmut Steinle, K.-J. Schramm, K. V. K. Iyengar, & T. PR. Prabhu THE EFFECT OF REPEATING GAMMA-RAY BURSTS ON W Vmax David L. Band THE CLASSICAL HYADES LITHIUM PROBLEM RESOLVED? Fritz J. Swenson, John Faulkner, Carlos A. Iglesias, Forrest J. Rogers, & David R. Alexander ON THE SPIN-DOWN OF PSR B1509-—58 V. M. Kaspi, R. N. Manchester, B. Siegman, S. Johnston, & A. G. Lyne A CANDIDATE IDENTIFICATION FOR PSR 0656+14 AND THE OPTICAL EMISSION FROM ISOLATED NEUTRON STARS Patrizia A. Caraveo, Giovanni F. Bignami, & Sandro Mereghetti NEAR-INFRARED OBSERVATIONS OF THE HH 46/47 SYSTEM L91 45-C9 Jochen Eisléffel, Chris J. Davis, Thomas P. Ray, & Reinhard Mundt INSTRUCTIONS TO AUTHORS OF LETTERS, RECENT LETTERS ABSTRACTS, AUTHOR AND SUBJECT INDEXES Inside Back Cover aeee e.