The X-ray variability of high-redshift QSOs |
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| Authors: | J.Manners O.Almaini A.Lawrence |
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| Affiliation: | Institute for Astronomy, University of Edinburgh, Royal Observatory, Blackford Hill, Edinburgh EH9 3HJ |
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| Abstract: | We present an analysis of X-ray variability in a sample of 156 radio-quiet quasars taken from the ROSAT archive, covering a redshift range 0.12) in the sense that QSOs of the same X-ray luminosity are more variable at z>2 . We discuss possible explanations for this effect. The simplest explanation may be that high-redshift QSOs are accreting at a larger fraction of the Eddington limit than local AGNs. |
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| Keywords: | galaxies: active galaxies: evolution galaxies: nuclei quasars: general X-rays: galaxies X-rays: general |
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