Limits of X-ray variability in active galactic nuclei

descriptionPublicationkeyboard_double_arrow_right Article 01 Apr 1986 English Publisher:Springer Science and Business Media LLCJournal:Nature, volume 320, pages 421-423 (issn: 0028-0836, eissn: 1476-4687,

Authors: P. Barr; R. F. Mushotzky;

doi: 10.1038/320421a0

Limits of X-ray variability in active galactic nuclei

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Abstract

A significant correlation is demonstrataed here between the X-ray luminosity and the timescale of X-ray variability for Seyfert galaxies and quasars. This is interpreted as evidence that the emitting plasma is near the limit of being dominated by electron-positron pairs. BL Lac objects do not follow this pattern; this may be due either to relativistic beaming or to the differing importance of the pair production process.

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National Aeronautics and Space Administration
United States
Goddard Space Flight Center
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European Space Agency
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European Space Operations Centre
Germany

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