Variability of optically selected quasars Virtual Observatory Resource

Authors
  1. Hook I.M.
  2. McMahon R.G.
  3. Boyle B.J.
  4. Irwin M.J.
  5. Published by
    CDS
Abstract

The variability properties of a sample of ~300 optically selected quasars near the South Galactic Pole (SGP) have been studied over a baseline of 16 years using a series of twelve UK Schmidt Telescope B_J_ plates at seven epochs. In this sample there is a correlation between variability and both quasar luminosity and redshift, at greater than the 99 per cent significance level. Quasars of high luminosity show significantly less variability than those with low luminosity, the rms variation ranging from about 0.25mag at M_B_=-23 to 0.1mag at M_B_=-28. The observed trends can be explained by an intrinsic dependence of quasar variability on luminosity combined with the effects of time dilation, and have implications for quasar samples selected by variability or multicolour techniques. The change in the slope of the n(m) relation at the break can be less pronounced in variability-selected samples. Our results can be used to test models for the origin and reprocessing of the continuum emission in quasars.

Keywords
  1. quasars
  2. redshifted
  3. apparent-magnitude
Bibliographic source Bibcode
1994MNRAS.268..305H
See also HTML
https://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/268/305
IVOA Identifier IVOID
ivo://CDS.VizieR/J/MNRAS/268/305
Document Object Identifer DOI
doi:10.26093/cds/vizier.72680305

Access

Web browser access HTML
http://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/268/305
https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/268/305
http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/268/305
IVOA Table Access TAP
http://tapvizier.cds.unistra.fr/TAPVizieR/tap
Run SQL-like queries with TAP-enabled clients (e.g., TOPCAT).
IVOA Cone Search SCS
For use with a cone search client (e.g., TOPCAT).
https://vizier.cds.unistra.fr/viz-bin/conesearch/0?
https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/268/305/tablea1?
http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/268/305/tablea1?

History

1997-12-09T21:38:16Z
Resource record created
1997-12-09T21:38:16Z
Created
2024-06-24T06:09:45Z
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