期刊
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
卷 375, 期 4, 页码 1479-1487出版社
OXFORD UNIV PRESS
DOI: 10.1111/j.1365-2966.2006.11413.x
关键词
galaxies : active; galaxies : Seyfert; X-rays : galaxies
We have examined simultaneous X-ray and optical light curves of a sample of eight nearby Seyfert 1 galaxies observed using the European Photon Imaging Camera (EPIC) X-ray cameras and Optical Monitor onboard XMM-Newton. The observations span similar to 1 d and revealed optical variability in four of the eight objects studied. In all the cases, the X-ray variability amplitude exceeded that of the optical both in fractional and in 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 the X-ray variability on the time-scales probed.
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