Large Bright Quasar Survey emission lines Virtual Observatory Resource

Authors
  1. Forster K.
  2. Green P.J.
  3. Aldcroft T.L.
  4. Vestergaard M.
  5. Foltz C.B.,Hewett P.C.
  6. Published by
    CDS
Abstract

We present measurements of the optical/UV emission lines for a large homogeneous sample of 993 quasars from the Large Bright Quasar Survey. Our largely automated technique accounts for continuum breaks and galactic reddening, and we perform multicomponent fits to emission line profiles, including the effects of blended iron emission, and of absorption lines both galactic and intrinsic. Here we describe the fitting algorithm and present the results of line fits to the LBQS sample, including upper limits to line equivalent widths when warranted. The distribution of measured line parameters, principally W_{lambda}_ and FWHM, are detailed for a variety of lines, including upper limits. We thus initiate a large-scale investigation of correlations between the high-energy continuum and emission lines in quasars, to be extended to complementary samples using similar techniques. High-quality, reproducible measurements of emission lines for uniformly selected samples will advance our understanding of active galaxies, especially in a new era of large surveys selected by a variety of complementary methods.

Keywords
  1. quasars
  2. surveys
  3. spectroscopy
  4. ultraviolet-astronomy
Bibliographic source Bibcode
2001ApJS..134...35F
See also HTML
https://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJS/134/35
IVOA Identifier IVOID
ivo://CDS.VizieR/J/ApJS/134/35
Document Object Identifer DOI
doi:10.26093/cds/vizier.21340035

Access

Web browser access HTML
http://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJS/134/35
https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJS/134/35
http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJS/134/35
IVOA Table Access TAP
http://tapvizier.cds.unistra.fr/TAPVizieR/tap
Run SQL-like queries with TAP-enabled clients (e.g., TOPCAT).

History

2001-08-22T21:57:49Z
Resource record created
2001-08-22T21:57:49Z
Created
2001-08-22T22:03:18Z
Updated

Contact

Name
CDS support team
Postal Address
CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France
E-Mail
cds-question@unistra.fr