Long-Term Optical Quasar Variability

Details Long-Term Optical Quasar Variability Long-Term Optical Quasar Variability

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aspc..360...29d&link_type=abstract

AGN Variability from X-Rays to Radio Waves ASP Conference Series, Vol. 360, Proceedings of the conference held 14-16 June, 2004

Astronomy and Astrophysics

Astrophysics

5

Scientific paper

We have used a large sample of 41,391 spectroscopically confirmed quasars, taken from the Sloan Digital Sky Survey Data Release 2 (DR2) and from the 2dF QSO Redshift Survey, to investigate the long term optical variability of quasars. The recent DR2 photometric information for the quasars can be combined with re-calibrated archival survey data to extend the variability time baseline towards ˜50 years. Based on structure function analysis, we conclude that quasar variability is intrinsic to the AGNs, and is caused by chromatic outbursts / flares with a limited luminosity range and varying time-scales, which have an asymmetric overall light-curve shape. Currently the model that has the most promise of fitting the observations is based on accretion-disk instabilities.

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