Astronomy and Astrophysics – Astrophysics
Scientific paper
1995-12-23
Astronomy and Astrophysics
Astrophysics
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.
Clemente A. Di
Giallongo Emanuele
Natali Giuliano
Trevese Dario
Vagnetti Fausto
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