Astrophysics

Authors and titles for March 2004

[101] arXiv:astro-ph/0403101 [pdf, other]

Title: A new powerful method for probing the atmospheres of transiting exoplanets

I.A.G. Snellen (IfA Edinburgh)

Comments: LaTex, 5 pages, 4 figs; submitted to MNRAS Letters

Journal-ref: Mon.Not.Roy.Astron.Soc. 353 (2004) L1

Subjects: Astrophysics (astro-ph)

[102] arXiv:astro-ph/0403102 [pdf, other]

Title: Are Halos of Collisionless Cold Dark Matter Collisionless?

Chung-Pei Ma, Michael Boylan-Kolchin (UC Berkeley)

Comments: 4 pages, 3 figures. Phys Rev Lett, in press on May 14

Journal-ref: Phys.Rev.Lett. 93 (2004) 021301

Subjects: Astrophysics (astro-ph); High Energy Physics - Phenomenology (hep-ph)

[103] arXiv:astro-ph/0403103 [pdf, other]

Title: VLA HI Observations of Gas Stripping in the Virgo Cluster Spiral NGC 4522

Jeffrey D. P. Kenney (1), J. H. van Gorkom (2), Bernd Vollmer (3) ((1) Yale University, (2) Columbia University, (3) CDS, Observatoire Astronomique de Strasbourg)

Comments: 39 pages, 14 figures, accepted for AJ June 2004, Version with full resolution figures available from this ftp URL

Journal-ref: Astron.J.127:3361-3374,2004

Subjects: Astrophysics (astro-ph)

[104] arXiv:astro-ph/0403104 [pdf, other]

Title: Modeling the Counts of Faint Radio Loud Quasars: Constraints on the Supermassive Black Hole Population and Predictions for High Redshift

Zoltan Haiman (Columbia), Eliot Quataert (UC Berkeley), Geoffrey C. Bower (UC Berkeley)

Comments: Submitted to ApJ, 7 emulateapj pages with 6 figures

Journal-ref: Astrophys.J. 612 (2004) 698-705

Subjects: Astrophysics (astro-ph)

[105] arXiv:astro-ph/0403105 [pdf, other]

Title: XMM-Newton Observations of NGC 507: Super-solar Metal Abundances in the Hot ISM

Dong-Woo Kim, Giuseppina Fabbiano

Comments: 29 pages, 6 figures, Accepted in ApJ (v613, Oct. 1, 2004); Minor revisions after referee's comments; A high-resolution pdf file available at this http URL

Subjects: Astrophysics (astro-ph)

[106] arXiv:astro-ph/0403106 [pdf, other]

Title: A sample of radio galaxies spanning three decades in radio luminosity - I. The host-galaxy properties and black-hole masses

Ross J. McLure, Chris J. Willott, Matt J. Jarvis, Steve Rawlings, Gary J. Hill, Ewan Mitchell, James S. Dunlop, Margrethe Wold

Comments: 17 pages, 10 figures, accepted for publication in MNRAS

Journal-ref: Mon.Not.Roy.Astron.Soc. 351 (2004) 347

Subjects: Astrophysics (astro-ph)

[107] arXiv:astro-ph/0403107 [pdf, other]

Title: Application of fast CCD drift scanning to speckle imaging of binary stars

O. Fors (1,2), E. P. Horch (3), J. Nunez (1,2) ((1) Universitat de Barcelona, (2) Observatori Fabra, (3) University of Massachusetts Dartmouth)

Comments: 8 pages, 8 figures, LaTeX, uses this http URL. Accepted for publication in A&A

Journal-ref: Astron.Astrophys. 420 (2004) 397-404

Subjects: Astrophysics (astro-ph)

[108] arXiv:astro-ph/0403108 [pdf, other]

Title: S4N: A Spectroscopic Survey of Stars in the Solar Neighborhood

Carlos Allende Prieto (1), Paul S. Barklem (2), David L. Lambert (1), Katia Cunha (3) ((1) University of Texas, USA (2) Uppsala Astronomical Observatory, Sweden, (3) Observatorio Nacional, Brazil)

Comments: 24 pages, 19 figures, to appear in A&A; data can be accessed from this http URL or this http URL

Journal-ref: Astron.Astrophys. 420 (2004) 183-205

Subjects: Astrophysics (astro-ph)

[109] arXiv:astro-ph/0403109 [pdf, other]

Title: Simulation of Vortex--Dominated Flows Using the FLASH Code

Vikram Dwarkadas, Tomek Plewa, Greg Weirs (U Chicago), Chris Tomkins, Mark Marr-Lyon (LANL)

Comments: 11 pages, to appear in the proceedings of the conference on "Adaptive Mesh Refinement - Theory and Applications", editors Tomasz Plewa, Timur Linde and V. Gregory Weirs

Subjects: Astrophysics (astro-ph)

[110] arXiv:astro-ph/0403110 [pdf, other]

Title: Consequences of Observational Uncertainties on the Detection of Cosmic Topology

B. Mota, M.J. Reboucas, R. Tavakol

Comments: To appear in the Proc. of 10th Marcel Grossmann Meeting on General Relativity. Latex2e, World Scientific proc. style files, 1 fig., 4 pages

Subjects: Astrophysics (astro-ph); General Relativity and Quantum Cosmology (gr-qc); High Energy Physics - Theory (hep-th); Mathematical Physics (math-ph)

[111] arXiv:astro-ph/0403111 [pdf, other]

Title: Problems with studying topology of the universe via circles from cosmic microwave background data

Evelise Gausmann, Reuven Opher

Comments: This paper has been withdrawn

Subjects: Astrophysics (astro-ph)

[112] arXiv:astro-ph/0403112 [pdf, other]

Title: Omega Centauri: The Population Puzzle Goes Deeper

L. R. Bedin (1), G. Piotto (1), J. Anderson (2), S. Cassisi (3), I. R. King (4), Y. Momany (1), G. Carraro (1). ((1) Dipartimento di Astronomia, Universita` di Padova, ITALY; (2) Department of Physics and Astronomy, Rice University, USA; (3) Osservatorio Astronomico Collurania, ITALY; (4) Astronomy Department, University of Washington, USA)

Comments: A_fine_piece_of_work: 12 pages, 2 figures, ApJL_ACCEPTED_, 4 March 2004; high resolution version of the paper available at: this ftp URL

Journal-ref: Astrophys.J.605:L125-L128,2004

Subjects: Astrophysics (astro-ph)

[113] arXiv:astro-ph/0403113 [pdf, other]

Title: SiO Maser Survey of the Large-Amplitude Variables in the Galactic Center

S. Deguchi, H. Imai, T. Fujii, I. S. Glass, Y. Ita, H. Izumiura, O. Kameya, A. Miyazaki, Y. Nakada, J. Nakashima

Comments: Hires. figures are available as No.604 of NRO report at this http URL . PASJ 56 (april 28 issue) in press

Subjects: Astrophysics (astro-ph)

[114] arXiv:astro-ph/0403114 [pdf, other]

Title: High-Energy Gamma-Ray Observations of W Comae with STACEE

STACEE Collaboration: R. A. Scalzo, L. M. Boone, D. Bramel, J. Carson, C. E. Covault, P. Fortin, G. Gauthier, D. M. Gingrich, D. S. Hanna, A. Jarvis, J. Kildea, T. Lindner, C. Mueller, R. Mukherjee, R. A. Ong, K. J. Ragan, D. A. Williams, J. A. Zweerink

Comments: 9 pages, 7 figures, uses this http URL. Accepted to ApJ

Journal-ref: Astrophys.J.607:778-787,2004

Subjects: Astrophysics (astro-ph)

[115] arXiv:astro-ph/0403115 [pdf, other]

Title: Radiative Shocks in Rotating Accretion Flows around Black Holes

T. Okuda, V. Teresi, E. Toscano, D. Molteni

Comments: 11pages, 5 Postscript figures, to appear in PASJ, Vol.56, No.3, 2004

Subjects: Astrophysics (astro-ph)

[116] arXiv:astro-ph/0403116 [pdf, other]

Title: Detection of X-ray Clusters of Galaxies by Matching RASS Photons and SDSS Galaxies within GAVO

Peter Schuecker, Hans Boehringer, Wolfgang Voges

Comments: 19 pages, low-resolution figures, accepted for publication in Astronomy and Astrophysics

Journal-ref: Astron.Astrophys. 420 (2004) 61-74

Subjects: Astrophysics (astro-ph)

[117] arXiv:astro-ph/0403117 [pdf, other]

Title: The crust cooling curve of the neutron star in MXB 1659-29

Rudy Wijnands

Comments: To appear in Proceedings of IAU Colloquium 194 "Compact binaries in the Galaxy and beyond" (Rev. Mex. A&A Conf. Series), eds. G. Tovmassian and E. Sion

Subjects: Astrophysics (astro-ph)

[118] arXiv:astro-ph/0403118 [pdf, other]

Title: Stellar polarimetry with ESPaDOnS

P. Petit, J.-F. Donati, The ESPaDOnS project team

Comments: Conference "Magnetism & Activity of the Sun and Stars", J. Arnaud & N. Meunier eds., 8 pages

Journal-ref: EAS Publications Series, Volume 9, 2003, pp.97

Subjects: Astrophysics (astro-ph)

[119] arXiv:astro-ph/0403119 [pdf, other]

Title: Radio spectra of a sample of X-ray selected BL Lacs

Francesca Cavallotti (1), Anna Wolter (1), John T. Stocke (2), Travis Rector (3) ((1) Osservatorio Astronomico di Brera, Milano, Italy, (2) Center for Astrophysics and Space Astronomy, University of Colorado, Boulder, USA, (3) University of Alaska, Anchorage, USA)

Comments: 9 pages, 5 figures, to be published in Astronomy and Astrophysics

Journal-ref: Astron.Astrophys. 419 (2004) 459-467

Subjects: Astrophysics (astro-ph)

[120] arXiv:astro-ph/0403120 [pdf, other]

Title: BeppoSAX-WFC monitoring of the Galactic Center region

Jean in 't Zand (1,2), Frank Verbunt (2), John Heise (1,2), Angela Bazzano (3), Massimo Cocchi (3), Remon Cornelisse (4), Erik Kuulkers (5), Lorenzo Natalucci (3), Pietro Ubertini (3) ((1) SRON Utrecht, (2) Utrecht University, (3) IASF/CNR Sezione Roma, (4) University of Southampton, (5) ESTEC/ESA)

Comments: 10 pages 6 figures, to appear in Proc. "The Restless High-Energy Universe" (2nd BeppoSAX Symposium), eds. E.P.J. van den Heuvel, J.J.M. in 't Zand & R.A.M.J. Wijers, Nucl. Instrum. Meth. B Suppl. Ser

Subjects: Astrophysics (astro-ph)

[121] arXiv:astro-ph/0403121 [pdf, other]

Title: The Absorption Signatures of Dwarf Galaxies: The z=1.04 Multicloud Weak MgII Absorber toward PG 1634+706

Stephanie G. Zonak, Jane C. Charlton, Jie Ding, Christopher W. Churchill

Journal-ref: Astrophys.J. 606 (2004) 196-212

Subjects: Astrophysics (astro-ph)

[122] arXiv:astro-ph/0403122 [pdf, other]

Title: Three-dimensional magnetohydrodynamic simulations of in situ shock formation in the coronal streamer belt

Yu. Zaliznyak, R. Keppens, J.P. Goedbloed

Comments: Published in Physics of Plasmas, large figures omitted here, complete version at this http URL

Journal-ref: Physics of Plasmas 10(11), 4478, 2003

Subjects: Astrophysics (astro-ph)

[123] arXiv:astro-ph/0403123 [pdf, other]

Title: A Dense-Cloud Model for Gamma-Ray Bursts to Explain Bimodality

F. Shekh-Momeni, J. Samimi

Comments: 30 pages, 14 figures, Submitted to ApJ

Subjects: Astrophysics (astro-ph)

[124] arXiv:astro-ph/0403124 [pdf, other]

Title: Adaptive mesh refinement for conservative systems: multi-dimensional efficiency evaluation

R. Keppens, M. Nool, G. Toth, J.P. Goedbloed

Comments: Published in Computer Physics Communications, figures absent due to file sizes, complete version at this http URL

Journal-ref: Comput.Phys.Commun. 153 (2003) 317

Subjects: Astrophysics (astro-ph)

[125] arXiv:astro-ph/0403125 [pdf, other]

Title: The two-dimensional magnetohydrodynamic Kelvin-Helmholtz instability: compressibility and large-scale coalescence effects

H. Baty, R. Keppens, P. Comte

Comments: Published in Physics of Plasmas, figures absent due to file sizes, full version at this http URL (follow Publications)

Journal-ref: Physics of Plasmas 10(12), 4661, 2003

Subjects: Astrophysics (astro-ph)

[126] arXiv:astro-ph/0403126 [pdf, other]

Title: Time-dependent ejection velocity model for the outflow of Hen 3--1475

P.F. Velazquez, A. Riera, A.C. Raga

Comments: Astronomy and Astrophysics (accepted) (8 figures)

Journal-ref: Astron.Astrophys. 419 (2004) 991-998

Subjects: Astrophysics (astro-ph)

[127] arXiv:astro-ph/0403127 [pdf, other]

Title: HI absorption at the center of NGC2146

A. Tarchi, A. Greve, A. B. Peck, N. Neininger, K. A. Wills, A. Pedlar, U. Klein

Comments: Eight pages. Six figures. Accepted for publication in MNRAS

Subjects: Astrophysics (astro-ph)

[128] arXiv:astro-ph/0403128 [pdf, other]

Title: Mechanical heating by active galaxies

Mitchell C. Begelman, Mateusz Ruszkowski

Comments: 10 pages, no figures. Submitted to Philosophical Transactions of the Royal Society (Series A: Mathematical, Physical and Engineering Sciences), proceedings of the Poyal Society Discussion Meeting on the Impact of Active Galaxies on the Universe at Large, London, February 16-17, 2004

Journal-ref: Phil.Trans.Roy.Soc.Lond. A363 (2005) 655-665

Subjects: Astrophysics (astro-ph)

[129] arXiv:astro-ph/0403129 [pdf, other]

Title: Spiral Galaxy - ICM Interactions in the Virgo Cluster

Jeffrey D. P. Kenney (Yale University), Hugh Crowl (Yale University), Jacqueline van Gorkom (Columbia University), Bernd Vollmer (Observatoire Astronomique de Strasbourg)

Comments: 6 pages, 4 figures, to appear in the ASP proceedings of IAU Symposium 217, "Recycling Intergalactic and Interstellar Matter", eds. Pierre-Alain Duc, Jonathan Braine, Elias Brinks. A version with high resolution figures is available at this ftp URL

Subjects: Astrophysics (astro-ph)

[130] arXiv:astro-ph/0403130 [pdf, other]

Title: Another possible interpretation of SN 1a data - without kinematics: Comments on the paper astro-ph/0402512 by A. Riess et al

Michael A. Ivanov

Comments: 5 pages with 2 figures; Comments on the paper astro-ph/0402512 by A. Riess et al

Subjects: Astrophysics (astro-ph); General Relativity and Quantum Cosmology (gr-qc)

[131] arXiv:astro-ph/0403131 [pdf, other]

Title: A Sub-Millimeter Search of Nearby Young Stars for Cold Dust: Discovery of Debris Disks around Two Low-Mass Stars

Michael C. Liu (IfA/Hawaii), Brenda C. Matthews (UC Berkeley), Jonathan P. Williams (IfA/Hawaii), Paul G. Kalas (UC Berkeley)

Comments: 9 pages, ApJ, in press. Minor changes made to reflect final published manuscript

Journal-ref: Astrophys.J. 608 (2004) 526-532

Subjects: Astrophysics (astro-ph)

[132] arXiv:astro-ph/0403132 [pdf, other]

Title: Discovery of a large dust disk around the nearby star AU Microscopium

Paul Kalas (UC Berkeley), Michael C. Liu (IfA, U. Hawaii), Brenda C. Matthews (UC Berkeley)

Comments: Manuscript and Supporting Online Material (16 pgs, 7 figs, 2 tables). Published online in Science Express (26 Feb. 2004); To appear in print in Science (2004)

Subjects: Astrophysics (astro-ph)

[133] arXiv:astro-ph/0403133 [pdf, other]

Title: Nuclear Stellar Populations in the Infrared Space Observatory Atlas of Bright Spiral Galaxies

George J. Bendo, Robert D. Joseph

Comments: AJ, 2004, in press

Subjects: Astrophysics (astro-ph)

[134] arXiv:astro-ph/0403134 [pdf, other]

Title: The Lifetimes of Molecular Cloud Cores: What is the Role of the Magnetic Field?

E. Vazquez-Semadeni (1), J. Kim (2), M. Shadmehri (3), J. Ballesteros-Paredes (1) ((1) CRyA-UNAM, (2) Korea Astronomy Observatory, (3) Ferdowsi University)

Comments: Contributed paper for the proceedings of "Gravitational Collapse: From Massive Stars to Planets", a meeting to honor Peter Bodenheimer, ed. G. Garcia-Segura. To appear in Rev. Mex. Astron. Ap., Ser. Conf. Uses this http URL. 5 pages, 3 figures. Animations can be downloaded from this http URL

Subjects: Astrophysics (astro-ph)

[135] arXiv:astro-ph/0403135 [pdf, other]

Title: Phase-Space Structure of Dark-Matter Haloes: Scale-Invariant PDF Driven by Substructure

I. Arad, A. Dekel, A. Klypin

Comments: 16 pages, 11 figures, submitted to mnras

Journal-ref: Mon.Not.Roy.Astron.Soc. 353 (2004) 15

Subjects: Astrophysics (astro-ph)

[136] arXiv:astro-ph/0403136 [pdf, other]

Title: The Globular Cluster System of the Canis Major Dwarf Galaxy

Duncan A. Forbes (Swinburne University), Jay Strader, Jean Brodie (UCSC)

Comments: 13 pages, Latex, 3 figures, 1 table, submitted to AJ

Subjects: Astrophysics (astro-ph)

[137] arXiv:astro-ph/0403137 [pdf, other]

Title: CMB Observations with a Compact Heterogeneous 150 GHz Interferometer in Chile

J. W. Fowler, W. B. Doriese, T. A. Marriage, H. T. Tran, A. M. Aboobaker, C. Dumont, M. Halpern, Z. D. Kermish, Y.-S. Loh, L. A. Page, S. T. Staggs, D. H. Wesley

Comments: 12 pages, 4 figures. v2: Final ApJS version; rewritten analysis section made more clear

Journal-ref: Astrophys. J. Suppl. 156 (2005) 1-11

Subjects: Astrophysics (astro-ph)

[138] arXiv:astro-ph/0403138 [pdf, other]

Title: Gamma-ray Spectra due to Cosmic-ray Interactions with Dense Gas Clouds

Michiko Ohishi, Masaki Mori (ICRR, Univ. Tokyo), Mark Walker (Univ. Sydney and ATNF/CSIRO)

Comments: Version accepted by ApJ (after proof reading), 12 pages, 8 figures, use AASTeX macros

Journal-ref: Astrophys.J. 610 (2004) 868-875

Subjects: Astrophysics (astro-ph)

[139] arXiv:astro-ph/0403139 [pdf, other]

Title: Deep near-infrared observations of W3 Main star forming region

D.K. Ojha, M. Tamura, Y. Nakajima, M. Fukagawa, K. Sugitani, C. Nagashima, T. Nagayama, T. Nagata, S. Sato, A.J. Pickles, K. Ogura

Comments: 30 pages, 11 figures in JPEG format. Accepted for the publication in ApJ. The preprint is also available at this http URL

Journal-ref: Astrophys.J. 608 (2004) 797-808

Subjects: Astrophysics (astro-ph)

[140] arXiv:astro-ph/0403140 [pdf, other]

Title: Dynamics of Intermediate Mass Black Holes in Star Clusters

Holger Baumgardt (RIKEN), Simon Portegies Zwart (Amsterdam), Steve McMillan (Drexel), Jun Makino (Univ. of Tokyo), Toshikazu Ebisuzaki (RIKEN)

Comments: 8 pages, 3 figures, to appear in the proceedings of the "The Formation and Evolution of Massive Young Clusters" conference, Cancun, Mexico, 17 - 21 November, 2003

Subjects: Astrophysics (astro-ph)

[141] arXiv:astro-ph/0403141 [pdf, other]

Title: Relativistic Version of Landau Theory of Fermi Liquid in Presence of Strong Quantizing Magnetic Field- An Exact Formalism

Sutapa Ghosh, Soma Mandal, Somenath Chakrabarty

Comments: REVTEX File, eight pages, no figure, accepted for Annals of Physics

Journal-ref: Annals Phys.312:398-410,2004

Subjects: Astrophysics (astro-ph)

[142] arXiv:astro-ph/0403142 [pdf, other]

Title: High-amplitude, long-term X-ray variability in the solar-type star HD 81809: the beginning of an X-ray activity cycle?

F. Favata, G. Micela, S.L. Baliunas, et al

Comments: Accepted for publication in A&A

Journal-ref: Astron.Astrophys.418:L13-L16,2004

Subjects: Astrophysics (astro-ph)

[143] arXiv:astro-ph/0403143 [pdf, other]

Title: The magnetic field along the jets of NGC 4258 as deduced from high frequency radio observations

M. Krause, A. L"ohr (MPI fuer Radioastronomie, Bonn, Germany)

Comments: 9 pages with 9 figures. Accepted for publication in A&A

Journal-ref: Astron.Astrophys. 420 (2004) 115-123

Subjects: Astrophysics (astro-ph)

[144] arXiv:astro-ph/0403144 [pdf, other]

Title: The chaotic behavior of the black hole system GRS 1915+105

R. Misra (IUCAA), K.P. Harikrishnan (The Cochin College), B. Mukhopadhyay (University of Oulu), G. Ambika (Maharajas College), A. K. Kembhavi (IUCAA)

Comments: Accepted for publication in Astrophysical Journal

Journal-ref: Astrophys.J. 609 (2004) 313-316

Subjects: Astrophysics (astro-ph); Chaotic Dynamics (nlin.CD)

[145] arXiv:astro-ph/0403145 [pdf, other]

Title: Molecular Gas around the Double Nucleus in M83

Kazushi Sakamoto (1), Satoki Matsushita (2), Alison B. Peck (1), Martina C. Wiedner (3,1), Daisuke Iono (1,4) ((1) Harvard-Smithsonian CfA, (2) ASIAA, (3), Univ. Koeln, (4) Univ. Massachusetts)

Comments: accepted for publication in ApJ Letters, 13 pages, 4 figures

Journal-ref: Astrophys.J. 616 (2004) L59-L62

Subjects: Astrophysics (astro-ph)

[146] arXiv:astro-ph/0403146 [pdf, other]

Title: Properties of Isolated Disk Galaxies

J. Varela, M. Moles, I. Márquez, G. Galletta, J. Masegosa, D. Bettoni

Comments: 28 pages, 5 figures. Accepted for publication in A&A

Journal-ref: Astron.Astrophys. 420 (2004) 873-879

Subjects: Astrophysics (astro-ph)

[147] arXiv:astro-ph/0403147 [pdf, other]

Title: Life and Death of Young Dense Star Clusters near the Galactic Center

Simon Portegies Zwart (Amsterdam), Stephen McMillan (Drexel), Holger Baumgardt (RIKEN)

Comments: 8 pages, to appear in "The Formation and Evolution of Massive Young Star Clusters", eds. H.J.G.L.M. Lamers, A. Nota & L. J. Smith

Subjects: Astrophysics (astro-ph)

[148] arXiv:astro-ph/0403148 [pdf, other]

Title: Stars of extragalactic origin in the solar neighborhood

T.V. Borkova (Rostov University), V.A. Marsakov (Rostov University)

Comments: Accepted for 2004, Astronomy Letters, Vol. 30, No. 3, P.148-158 15 pages, 3 figures

Journal-ref: Astron.Lett. 30 (2004) 148-158

Subjects: Astrophysics (astro-ph)

[149] arXiv:astro-ph/0403149 [pdf, other]

Title: Absorption in Gamma Ray Burst afterglows

G. Stratta (1 and 2), F. Fiore (2), L. A. Antonelli (2), L. Piro (3), M. De Pasquale (3) ((1) Universita' di Roma "La Sapienza", (2) OAR/INAF, (3) IASF/CNR)

Comments: 53 pages, 13 figures, ApJ in press, June 2004

Journal-ref: Astrophys.J. 608 (2004) 846-864

Subjects: Astrophysics (astro-ph)

[150] arXiv:astro-ph/0403150 [pdf, other]

Title: Modelling Faraday Screens in the Interstellar Medium

Maik Wolleben, Wolfgang Reich

Comments: 6 pages, 4 figures

Journal-ref: in "The Magnetized Interstellar Medium", eds. B. Uyaniker, W. Reich & R. Wielebinski, Copernicus GmbH, Katlenburg-Lindau, 2004, p.99

Subjects: Astrophysics (astro-ph)