Astronomy and Astrophysics – Astrophysics
Scientific paper
2007-01-08
Mon.Not.Roy.Astron.Soc.375:1479-1487,2007
Astronomy and Astrophysics
Astrophysics
9 pages, 2 figures, accepted for publication in MNRAS
Scientific paper
10.1111/j.1365-2966.2006.11413.x
We have examined simultaneous X-ray and optical light curves of a sample of eight nearby Seyfert 1 galaxies observed using the EPIC X-ray cameras and Optical Monitor on board XMM. The observations span ~1 day and revealed optical variability in four of the eight objects studied. In all cases, the X-ray variability amplitude exceeded that of the optical both in fractional and absolute luminosity terms. No clearly significant correlations were detected between wavebands using cross correlation analysis. We conclude that, in three of the four objects in which optical variability was detected, reprocessing mechanisms between wavebands do not dominate either the optical or X-ray variability on the time-scales probed.
Smith Rachel
Vaughan Stewart
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