Astrophysics

Authors and titles for July 2000

[401] arXiv:astro-ph/0007401 [pdf, other]

Title: Supermassive Black Holes in Disk Galaxies

John Kormendy (Department of Astronomy, University of Texas at Austin)

Comments: 9 pages, 4 color figures, LaTeX, ASP Conference Series, submitted

Subjects: Astrophysics (astro-ph)

[402] arXiv:astro-ph/0007402 [pdf, other]

Title: The HI Content of Spirals. II. Gas Deficiency in Cluster Galaxies

Jose M. Solanes (1), Alberto Manrique (2), Carlos Garcia-Gomez (1), Guillermo Gonzalez-Casado (3), Riccardo Giovanelli (4), Martha P. Haynes (4) ((1) URV,Spain; (2) UB, Spain; (3) UPC, Spain; (4) Cornell Univ.)

Comments: Accepted for publication in the Astrophysical Journal

Subjects: Astrophysics (astro-ph)

[403] arXiv:astro-ph/0007403 [pdf, other]

Title: On the nature of cosmic rays above the Greisen--Zatsepin--Kuz'min cut off

L. A. Anchordoqui, M. Kirasirova, T. P. McCauley, S. Reucroft, J. D. Swain

Comments: Revised version, improvements per referee's suggestions. To be published in Phys. Lett. B

Journal-ref: Phys.Lett. B492 (2000) 237-244

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

[404] arXiv:astro-ph/0007404 [pdf, other]

Title: Computational AstroStatistics: Fast Algorithms and Efficient Statistics for Density Estimation in Large Astronomical Datasets

R. C. Nichol (Physics, CMU), A. J. Connolly (Physics and Astronomy, UPitt), A. W. Moore (CS, CMU), J. Schneider (CS, CMU), C. Genovese (Stats, CMU), L. Wasserman (Stats, CMU)

Comments: Proceedings from ``Virtual Observatories of the Future'' edited by R. J. Brunner, S. G. Djorgovski, A. Szalay

Subjects: Astrophysics (astro-ph)

[405] arXiv:astro-ph/0007405 [pdf, other]

Title: X-ray spectral components in the hard state of GRS 1915+105: origin of the 0.5 - 10 Hz QPO

A. R. Rao (1), S. Naik (1), S. V. Vadawale (1), S. K. Chakrabarti (2) ((1)TIFR, Mumbai, India. (2)SNBNCBS, Calcutta, India.)

Comments: 5 pages, 4 figures. Accepted for publication in A&A Letters

Subjects: Astrophysics (astro-ph)

[406] arXiv:astro-ph/0007406 [pdf, other]

Title: The Discovery of Broad P Cygni X-ray Lines from Circinus X-1 with the Chandra High Energy Transmission Grating Spectrometer

W.N. Brandt (Penn State), N.S. Schulz (MIT)

Comments: 17 pages, ApJL, in press; minor improvements made to address referee's suggestions

Subjects: Astrophysics (astro-ph)

[407] arXiv:astro-ph/0007407 [pdf, other]

Title: Extreme intranight variability in the BL Lacertae object AO 0235+164

G.E. Romero, S.A. Cellone, J.A. Combi

Comments: 4 pages, 3 figures, to appear in Astronomy & Astrophysics (Letters)

Subjects: Astrophysics (astro-ph)

[408] arXiv:astro-ph/0007408 [pdf, other]

Title: The X-ray Faint Early-Type Galaxy NGC4697

Jimmy A. Irwin (University of Michigan), Craig L. Sarazin (University of Virginia), Joel N. Bregman (University of Michigan)

Comments: 10 pages, uses this http URL, accepted by Astrophysical Journal

Subjects: Astrophysics (astro-ph)

[409] arXiv:astro-ph/0007409 [pdf, other]

Title: The Onset of Cluster Formation around Intermediate Mass Stars

Leonardo Testi, Francesco Palla, Antonella Natta (Arcetri)

Comments: 10 pages, to be published in "From Darkness to Light", T. Montmerle and Ph. Andre' Eds., ASP Conf. Series, Full resolution figures available at this http URL

Subjects: Astrophysics (astro-ph)

[410] arXiv:astro-ph/0007410 [pdf, other]

Title: A comparison of central temperatures of the intracluster gas determined from X-ray and SZ measurements

Tong-Jie Zhang, Xiang-Ping Wu

Comments: 11 pages, 1 figure, 1 table, accepted for publication in ApJ

Subjects: Astrophysics (astro-ph)

[411] arXiv:astro-ph/0007411 [pdf, other]

Title: 1.65 micron (H-band) surface photometry of galaxies. V: Profile decomposition of 1157 galaxies

G. Gavazzi, P. Franzetti, M. Scodeggio, A. Boselli, D. Pierini

Comments: LaTex, 17 pages, 16 figures, accepted for publication in A&A

Subjects: Astrophysics (astro-ph)

[412] arXiv:astro-ph/0007412 [pdf, other]

Title: Presupernova collapse models with improved weak-interaction rates

A. Heger (1), K. Langanke (2), G. Martinez-Pinedo (2), S.E. Woosley (1) ((1) UCO/Lick Observatory, University of California; (2) Institut for Fysik og Astronomi, Aarhus Universitet)

Comments: 4 pages, 2 figures

Journal-ref: Phys.Rev.Lett. 86 (2001) 1678-1681

Subjects: Astrophysics (astro-ph); Nuclear Theory (nucl-th)

[413] arXiv:astro-ph/0007413 [pdf, other]

Title: The Effect of Gas Loss on the Formation of Bound Stellar Clusters

Michael P. Geyer, Andreas Burkert

Comments: 6 pages, 7 figures, submitted to MNRAS

Journal-ref: Mon.Not.Roy.Astron.Soc. 323 (2001) 988

Subjects: Astrophysics (astro-ph)

[414] arXiv:astro-ph/0007414 [pdf, other]

Title: Compact star clusters of the LMC HII region N11C

M. Heydari-Malayeri, P. Royer, G. Rauw, N. R. Walborn

Comments: 12 pages, 8 figures

Subjects: Astrophysics (astro-ph)

[415] arXiv:astro-ph/0007415 [pdf, other]

Title: Wide-Field Thermal Imaging of the Orion Nebula at High Spatial Resolution

L. K. Deutsch, M. Kassis, N. Smith, J. L. Hora, H. M. Butner, W. F. Hoffmann, G. G. Fazio, A. Dayal

Comments: 8 pages, 4 figures, To appear in The Orion Complex Revisited, eds. M. J. McCaughrean and A. Burkert, ASP Conference Series

Subjects: Astrophysics (astro-ph)

[416] arXiv:astro-ph/0007416 [pdf, other]

Title: A test of arm induced star formation in spiral galaxies from near-IR and H\alpha imaging

M.S. Seigar (Imperial College), P.A. James (Liverpool John Moores University)

Comments: 2 pages. To be published in the proceedings of ``Galaxy Disks and Disk Galaxies''

Subjects: Astrophysics (astro-ph)

[417] arXiv:astro-ph/0007417 [pdf, other]

Title: A Near-Infrared Stellar Census of Blue Compact Dwarf Galaxies: NICMOS Detection of Red Giant Stars in the Wolf-Rayet Galaxy Mrk 178

Regina E. Schulte-Ladbeck (U. Pitt.), Ulrich Hopp (U. Munich), Laura Greggio (U. Munich & U. Bologna), Mary M. Crone (Skidmore College)

Comments: 27 Pages, 1 Table, 14 Figures, to appear in the October issue of AJ

Subjects: Astrophysics (astro-ph)

[418] arXiv:astro-ph/0007418 [pdf, other]

Title: Mid-infrared interferometry on spectral lines: III. Ammonia and Silane around IRC+10216 and VY CMa

J. D. Monnier (1,4), W. C. Danchi (2,4), D. S. Hale (4), P. G. Tuthill (3,4), C. H. Townes (4) ((1) Smithsonian Astrophysical Observatory (2) NASA-GSFC (3) University of Sydney (4) Space Sciences Lab, UC Berkeley)

Comments: 31 Pages, Accepted in the Astrophysical Journal

Subjects: Astrophysics (astro-ph)

[419] arXiv:astro-ph/0007419 [pdf, other]

Title: Testing Standard and Degenerate Big Bang Nucleosynthesis with BOOMERanG and MAXIMA-1

S. Esposito, G. Mangano, A. Melchiorri, G. Miele, O. Pisanti

Comments: 4 pages, RevTeX, 2 figures .eps. Some typos corrected, figure 1 improved

Journal-ref: Phys.Rev. D63 (2001) 043004

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

[420] arXiv:astro-ph/0007420 [pdf, other]

Title: Simulated Extragalactic Observations with a Cryogenic Imaging Spectrophotometer

Ben A. Mazin, Robert J. Brunner

Comments: 30 pages, 10 figures, accepted for publication in the Astronomical Journal

Subjects: Astrophysics (astro-ph)

[421] arXiv:astro-ph/0007421 [pdf, other]

Title: Modeling the X-ray - UV Correlations in NGC 3516

Demos Kazanas, Sergei Nayakshin (NASA/GSFC)

Comments: submitted to ApJ (June 2000); 25 pages with 14 figures

Subjects: Astrophysics (astro-ph)

[422] arXiv:astro-ph/0007422 [pdf, other]

Title: Dust Distribution in Gas Disks. A Model for the Ring Around HR 4796A

Hubert Klahr, D.N.C. Lin (UCO/Lick Observatory, Santa Cruz)

Comments: proof read version, 26 pages, LaTex, 11 figures. To appear in The Astronomical Journal June 2001

Subjects: Astrophysics (astro-ph)

[423] arXiv:astro-ph/0007423 [pdf, other]

Title: Neutron Stars and Quantum Billiards

Aurel Bulgac, Piotr Magierski

Comments: 11 pages, contribution to the Nobel Symposium on Quantum Chaos Y2K, Backaskog Castle, Sweden, June 13-17, 2000

Journal-ref: Phys.Scripta T90 (2001) 150-153

Subjects: Astrophysics (astro-ph); Chaotic Dynamics (nlin.CD); Nuclear Theory (nucl-th)

[424] arXiv:astro-ph/0007424 [pdf, other]

Title: HST/NICMOS observations of the host galaxies of powerful radio sources: Does size matter?

W. H. de Vries, C. P. O'Dea, P. D. Barthel, C. Fanti, R. Fanti, M. D. Lehnert

Comments: 21 pages, 9 figures + 19 additional images (jpg). Accepted for publication in the Astronomical Journal (Nov 2000 issue)

Subjects: Astrophysics (astro-ph)

[425] arXiv:astro-ph/0007425 [pdf, other]

Title: The W4 chimney/superbubble

Magdalen Normandeau

Comments: 4 pages, 1 figure, to appear in the proceedings of "Stars, Gas and Dust in Galaxies: Exploring the links",eds. D. Alloin, G. Galaz, K. Olsen

Subjects: Astrophysics (astro-ph)

[426] arXiv:astro-ph/0007426 [pdf, other]

Title: On Galaxy-Cluster Sizes and Temperatures

Licia Verde (IfA, Edinburgh; Princeton), Marc Kamionkowski (Caltech), Joseph J. Mohr (U. of Chicago; University of Illinois), Andrew J. Benson (U. of Durham; Caltech)

Comments: 6 pages, 7 figures; replacement to match the published version

Journal-ref: Mon.Not.Roy.Astron.Soc. 321 (2001) L7-L13

Subjects: Astrophysics (astro-ph)

[427] arXiv:astro-ph/0007427 [pdf, other]

Title: PG 2131+066: A Test of Pre-White Dwarf Asteroseismology

M. Reed, Steven D. Kawaler, M. Sean O'Brien

Comments: 13 pages, 4 figures, to appear in The Astrophysical Journal, Dec.10, 2000

Subjects: Astrophysics (astro-ph)

[428] arXiv:astro-ph/0007428 [pdf, other]

Title: Inferences from the dark sky: Olbers' paradox revisited

Mauro Arpino (Planetario "<a href="http://U.Hoepli" rel="external noopener nofollow" class="link-external link-http">this http URL</a>", Milano, Italy), Fabio Scardigli (ITP, University of Bern, Bern, Switzerland)

Comments: LaTex file, 10 pages, no figures. Some minor errors corrected, and some references added

Journal-ref: Eur.J.Phys. 24 (2003) 39-46

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

[429] arXiv:astro-ph/0007429 [pdf, other]

Title: Scintillation-Induced Circular Polarization in Pulsars and Quasars

J.-P. Macquart, D.B. Melrose (U. Syd.)

Comments: 21 pages, 3 figures, ApJ, accepted

Subjects: Astrophysics (astro-ph)

[430] arXiv:astro-ph/0007430 [pdf, other]

Title: The ASCA Hard Serendipitous Survey

R. Della Ceca, V. Braito, I. Cagnoni, T. Maccacaro

Comments: 4 pages, LaTex manuscript. Proceedings of the Conference SAIt 2000, XLIV Congresso Nazionale, Monte Porzio Catone (Rome, Italy) 10-15 April 2000. To be published in Mem. Soc. Astr. It

Subjects: Astrophysics (astro-ph)

[431] arXiv:astro-ph/0007431 [pdf, other]

Title: The ASCA HSS: Looking for Type 2 AGN

R. Della Ceca, V. Braito, V. Beckmann, I. Cagnoni, T. Maccacaro

Comments: 3 pages, LaTex manuscript. Proceedings of the Fourth Italian Conference on AGNs, Trieste (Italy) May 15-18 2000. To be published in Mem. Soc. Astr. It

Subjects: Astrophysics (astro-ph)

[432] arXiv:astro-ph/0007432 [pdf, other]

Title: Comptonization in X-ray bright neutron star globular cluster systems

M.Guainazzi (1), A.N.Parmar (2), T.Oosterbroek (2) ((1) XMM-Newton SOC, VILSPA, ESA, Madrid, E; (2) SSD of ESA, ESTEC, Noordwijk, NL)

Comments: 4 Latex pages, 6 figures, To appear in "Proceedings of X-ray Astronomy '99 - Stellar Endpoints, AGN and the Diffuse Background," 2000. G. Malaguti, this http URL & N. White (eds), Gordon & Breach (Singapore)

Subjects: Astrophysics (astro-ph)

[433] arXiv:astro-ph/0007433 [pdf, other]

Title: Disk Galaxies and Galaxy Disks

J.G. Funes S.J (Vatican Observatory), E.M. Corsini (Univ. of Padova)

Comments: 5 pages. To appear in Nov. 2000 PASP's "Conference Highlights"

Subjects: Astrophysics (astro-ph)

[434] arXiv:astro-ph/0007434 [pdf, other]

Title: Spectral energy distributions of FRI nuclei and the FRI/BL Lac unifying model

A. Capetti (1), E. Trussoni (1), A. Celotti (2), L. Feretti (3), M. Chiaberge (2) ((1) Osservatorio Astronomico di Torino, (2) SISSA - Trieste, (3) Istituto di Radioastronomia CNR - Bologna)

Comments: 10 pages, 5 figures, accepted for publication in MNRAS

Journal-ref: New Astron.Rev. 46 (2002) 335-337

Subjects: Astrophysics (astro-ph)

[435] arXiv:astro-ph/0007435 [pdf, other]

Title: HST infrared imaging polarimetry of Centaurus A: implications for the unified scheme and the existence of a mis-directed BL Lac nucleus

A. Capetti, E.J. Schreier, D.J. Axon, S. Young, J.H. Hough, S. Clark, A. Marconi, F.D. Macchetto, C. Packham

Comments: 12 pages, 5 figures, accepted for publication in ApJ

Subjects: Astrophysics (astro-ph)

[436] arXiv:astro-ph/0007436 [pdf, other]

Title: The origin of runaway stars

R. Hoogerwerf, J.H.J. de Bruijne, P.T. de Zeeuw

Comments: 5 pages, including 2 eps-figures and 1 table, submitted to the ApJ Letters. The manuscript was typeset using aastex

Subjects: Astrophysics (astro-ph)

[437] arXiv:astro-ph/0007437 [pdf, other]

Title: An excess of mid-IR luminous galaxies in Abell 1689?

D. Fadda (1), D. Elbaz (1), P.-A. Duc (1), H. Flores (1), A. Franceschini (2), C. J. Cesarsky (3), A. F. M. Moorwood (3) ((1) CEA-Saclay (2) Padova Univ. (3) ESO Garching)

Comments: 15 pages, 13 figures, accepted by Astronomy and Astrophysics

Subjects: Astrophysics (astro-ph)

[438] arXiv:astro-ph/0007438 [pdf, other]

Title: A Possible Intrinsic Fluence-Duration Power-Law Relation in Gamma-ray Bursts

L.G. Balazs, P.Meszaros, Z. Bagoly, I. Horvath, A. Meszaros

Comments: revised version, ApJ subm 3/15/01; includes substantial additional calculations and discussion of biases, title change, additional figure

Subjects: Astrophysics (astro-ph)

[439] arXiv:astro-ph/0007439 [pdf, other]

Title: Young Stellar Groups, Runaway Stars, and Pulsars

Tim de Zeeuw, Ronnie Hoogerwerf, Jos de Bruijne

Comments: To appear in: Dynamics of Starclusters and the Milky Way eds S. Deiters, B. Fuchs, A. Just, R. Spurzem, R. Wielen, ASP Conf. Ser

Subjects: Astrophysics (astro-ph)

[440] arXiv:astro-ph/0007440 [pdf, other]

Title: Metal Enrichment of The Primordial Interstellar Medium through 3-D Hydrodynamical Evolution of The First Supernova Remnant

Naohito Nakasato, Toshikazu Shigeyama (Research Center for the Early Universe, University of Tokyo)

Comments: 6 pages, 3 figures. To appear in the Astrophysical Journal Letters

Subjects: Astrophysics (astro-ph)

[441] arXiv:astro-ph/0007441 [pdf, other]

Title: The X-Ray Jet of PKS 0637-752: Inverse Compton Radiation from the Cosmic Microwave Background ?

F. Tavecchio, L. Maraschi R.M. Sambruna, C.M. Urry

Comments: 14 pages, 2 figures, submitted to ApJ Letters

Subjects: Astrophysics (astro-ph)

[442] arXiv:astro-ph/0007442 [pdf, other]

Title: Cygnus OB2 - a young globular cluster in the Milky Way

J. Knodlseder

Comments: 10 pages, 8 figures, accepted for publication in A&A

Subjects: Astrophysics (astro-ph)

[443] arXiv:astro-ph/0007443 [pdf, other]

Title: Sources of CMB Spots in Closed Hyperbolic Universes

Helio V. Fagundes (Instituto de Fisica Teorica, UNESP, Sao Paulo)

Comments: 8 pages, 2 figures. Presented at the IX Marcel Grossmann Meeting on General Relativity (Rome, 2-8 July, 2000)

Subjects: Astrophysics (astro-ph)

[444] arXiv:astro-ph/0007444 [pdf, other]

Title: Death of Stellar Baryonic Dark Matter Candidates

Katherine Freese, Brian Fields, David Graff

Comments: contribution to: Sources and Detection of Dark Matter in the Universe, Marina del Rey, CA, February 2000

Subjects: Astrophysics (astro-ph)

[445] arXiv:astro-ph/0007445 [pdf, other]

Title: An excess of very bright stars in the inner bulge

M. Lopez-Corredoira, F. Garzon, P. L. Hammersley

Comments: 6 pages, 12 figures, accepted to be published in MNRAS

Journal-ref: Mon.Not.Roy.Astron.Soc. 320 (2001) 31

Subjects: Astrophysics (astro-ph)

[446] arXiv:astro-ph/0007446 [pdf, other]

Title: The Stability of Radiatively Cooled Jets in Three Dimensions

Jianjun Xu (U. Maryland), Philip Hardee (U. Alabama), James Stone (U. Maryland)

Comments: 32 pages, 13 figures, figures included in page total

Subjects: Astrophysics (astro-ph)

[447] arXiv:astro-ph/0007447 [pdf, other]

Title: On the compared accuracy and reliability of spectroscopic and photometric redshift measurements

Alberto Fernandez-Soto, Kenneth M. Lanzetta, Hsiao-Wen Chen, Sebastian M. Pascarelle, Noriaki Yahata

Comments: Accepted for publication in ApJSS. Minor changes in presentation and discussion. No changes to main results. ApJ preprint format, 27 pages, 16 embedded figures

Journal-ref: Astrophys.J.Suppl. 135 (2001) 41-62

Subjects: Astrophysics (astro-ph)

[448] arXiv:astro-ph/0007448 [pdf, other]

Title: MBM12: A Younger Version of the TW Hydrae Association?

Scott J. Wolk (CfA), Rebecca T. Cover (Williams College), Ray Jayawardhana (UC Berkeley), Thomas J. Hearty (JPL)

Comments: 5 pages, to be published in "From Darkness to Light," ed. T. Montmerle and Ph. Andre, ASP Conference Series (2000)

Subjects: Astrophysics (astro-ph)

[449] arXiv:astro-ph/0007449 [pdf, other]

Title: The Onset of Methane in L Dwarfs

Keith S. Noll (STScI), T. R. Geballe (Gemini Hawaii), S. K. Leggett (JAC Hawaii), Mark S. Marley (NMSU)

Comments: 12 pages, 2 figures; accepted by ApJ Letters

Subjects: Astrophysics (astro-ph)

[450] arXiv:astro-ph/0007450 [pdf, other]

Title: Large scale dynamos with ambipolar diffusion nonlinearity

Axel Brandenburg, Kandaswamy Subramanian

Comments: 4 pages, 5 figures

Journal-ref: Astron. Astrophys. 361, L33-L36 (2000)

Subjects: Astrophysics (astro-ph)