The Variability of Quasars. II. Frequency Dependence

Astronomy and Astrophysics – Astrophysics

Scientific paper

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23 pages, uuencoded, compressed postscript file including figures, also available at http://itovf2.roma2.infn.it/vagnetti/cimp

Scientific paper

10.1086/177261

The variability of 30 PG quasars has been observed in the red band during three years. A rest-frame structure function analysis shows an increase of variability with the time interval up to 0.2 mag r.m.s. after two years. A comparison with the IUE data available for PG quasars shows that the variability increases with the rest-frame frequency at each time interval. Evidence for this effect is supported by the analysis of the average variability of other published quasar samples. The effect can completely account for the increase of variability with redshift found in other studies.

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