Sign on

SAO/NASA ADS Astronomy Abstract Service


· Find Similar Abstracts (with default settings below)
· Electronic Refereed Journal Article (HTML)
· Full Refereed Journal Article (PDF/Postscript)
· arXiv e-print (arXiv:0810.2747)
· On-line Data
· References in the article
· Citations to the Article (14) (Citation History)
· Refereed Citations to the Article
· SIMBAD Objects (297)
· Also-Read Articles (Reads History)
·
· Translate This Page
Title:
A Catalog of Broad Absorption Line Quasars in Sloan Digital Sky Survey Data Release 5
Authors:
Gibson, Robert R.; Jiang, Linhua; Brandt, W. N.; Hall, Patrick B.; Shen, Yue; Wu, Jianfeng; Anderson, Scott F.; Schneider, Donald P.; Vanden Berk, Daniel; Gallagher, S. C.; Fan, Xiaohui; York, Donald G.
Affiliation:
AA(Department of Astronomy and Astrophysics, Pennsylvania State University, 525 Davey Laboratory, University Park, PA 16802, USA ), AB(Steward Observatory, The University of Arizona, 933 North Cherry Avenue, Tucson, AZ 85721-0065, USA ), AC(Department of Astronomy and Astrophysics, Pennsylvania State University, 525 Davey Laboratory, University Park, PA 16802, USA ), AD(Department of Physics and Astronomy, York University, 4700 Keele St., Toronto, ON M3J 1P3, Canada ), AE(Princeton University Observatory, Princeton, NJ 08544, USA ), AF(Department of Astronomy and Astrophysics, Pennsylvania State University, 525 Davey Laboratory, University Park, PA 16802, USA ), AG(Astronomy Department, University of Washington, Seattle, WA 98195, USA ), AH(Department of Astronomy and Astrophysics, Pennsylvania State University, 525 Davey Laboratory, University Park, PA 16802, USA ), AI(Department of Astronomy and Astrophysics, Pennsylvania State University, 525 Davey Laboratory, University Park, PA 16802, USA ), AJ(Department of Physics and Astronomy, The University of Western Ontario, 1151 Richmond Street, London, ON N6A 3K7, Canada ; Department of Physics and Astronomy, University of California-Los Angeles, 430 Portola Plaza, Los Angeles, CA 90095-1547, USA ), AK(Steward Observatory, The University of Arizona, 933 North Cherry Avenue, Tucson, AZ 85721-0065, USA ), AL(Department of Astronomy and Astrophysics and the Enrico Fermi Institute, University of Chicago, 5640 So. Ellis Ave., Chicago, IL 60637, USA)
Publication:
The Astrophysical Journal, Volume 692, Issue 1, pp. 758-777 (2009). (ApJ Homepage)
Publication Date:
02/2009
Origin:
IOP
ApJ Keywords:
galaxies: active, galaxies: nuclei, quasars: absorption lines, quasars: emission lines, X-rays: general
DOI:
10.1088/0004-637X/692/1/758
Bibliographic Code:
2009ApJ...692..758G

Abstract

We present a catalog of 5039 broad absorption line (BAL) quasars (QSOs) in the Sloan Digital Sky Survey (SDSS) Data Release 5 (DR5) QSO catalog that have absorption troughs covering a continuous velocity range >=2000 km s-1. We have fitted ultraviolet (UV) continua and line emission in each case, enabling us to report common diagnostics of BAL strengths and velocities in the range -25, 000 to 0 km s-1 for Si IV λ1400, C IV λ1549, Al III λ1857, and Mg II λ2799. We calculate these diagnostics using the spectrum listed in the DR5 QSO catalog, and also for spectra from additional SDSS observing epochs when available. In cases where BAL QSOs have been observed with Chandra or XMM-Newton, we report the X-ray monochromatic luminosities of these sources. We confirm and extend previous findings that BAL QSOs are more strongly reddened in the rest-frame UV than non-BAL QSOs, and that BAL QSOs are relatively X-ray weak compared to non-BAL QSOs. The observed BAL fraction is dependent on the spectral signal-to-noise ratio (S/N); for higher S/N sources, we find an observed BAL fraction of ≈ 15%. BAL QSOs show a similar Baldwin effect as for non-BAL QSOs, in that their C IV emission equivalent widths decrease with increasing continuum luminosity. However, BAL QSOs have weaker C IV emission in general than do non-BAL QSOs. Sources with higher UV luminosities are more likely to have higher-velocity outflows, and the BAL outflow velocity and UV absorption strength are correlated with relative X-ray weakness. These results are in qualitative agreement with models that depend on strong X-ray absorption to shield the outflow from overionization and enable radiative acceleration. In a scenario in which BAL trough shapes are primarily determined by outflow geometry, observed differences in Si IV and C IV trough shapes would suggest that some outflows have ion-dependent structure.
Bibtex entry for this abstract   Preferred format for this abstract (see Preferences)

   

Find Similar Abstracts:

Use: Authors
Title
Keywords (in text query field)
Abstract Text
Return: Query Results Return    items starting with number
Query Form
Database: Astronomy
Physics
arXiv e-prints