Radio properties of optically selected quasars Virtual Observatory Resource

Authors
  1. Hooper E.J.
  2. Impey C.D.
  3. Foltz C.B.
  4. Hewett P.C.
  5. Published by
    CDS
Abstract

Approximately one-quarter (256 objects) of the Large Bright Quasar Survey (LBQS, Hewett et al., 1995, Cat. <J/AJ/109/1498>) has been observed with the VLA at 8.4GHz, resulting in 44 detections (17%) with a median 3{sigma} noise limit of 0.29mJy. Quasars with radio luminosity detectable at this limit are under-represented at faint absolute blue magnitudes (M_B_>=-24), an effect which cannot be explained by a potential LBQS selection bias against quasars which have large radio luminosities and small optical luminosities. The radio-loud (8GHz luminosity >10^25^W/Hz) fraction is observed to change as a function of redshift and MB, for M_B_<-24, although the causal variable is ambiguous. The description most consistent with the available data is that radio-loud fraction is approximately constant over the range -27.5<M_B_<-24 and increases at brighter absolute magnitudes. The radio-loud fraction as a function of redshift reaches a local maximum at z~1, and, aside from the effects of increased radio-loud fraction at bright M_B_, remains roughly constant to redshifts approaching 5. The log R_8.4_ distribution (radio-to-optical luminosity ratio) of the current LBQS sample may be bimodal, but the results of statistical tests are ambiguous, requiring a larger sample size to become definite.

Keywords
  1. quasars
  2. redshifted
  3. radio-sources
Bibliographic source Bibcode
1995ApJ...445...62H
See also HTML
https://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/445/62
IVOA Identifier IVOID
ivo://CDS.VizieR/J/ApJ/445/62
Document Object Identifer DOI
doi:10.26093/cds/vizier.14450062

Access

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https://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/445/62
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http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/445/62
IVOA Table Access TAP
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History

1998-06-04T18:05:32Z
Resource record created
1998-06-04T18:05:32Z
Created
1998-06-04T18:05:39Z
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