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Oxford University Press, Monthly Notices of the Royal Astronomical Society, 2(315), p. 325-336, 2000

DOI: 10.1046/j.1365-8711.2000.03385.x

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X-ray variability in a deep, flux limited sample of QSOs

Journal article published in 1999 by O. Almaini ORCID, A. Lawrence, T. Shanks, A. C. Edge, Bj J. Boyle, I. Georgantopoulos, Kf F. Gunn, Gc C. Stewart, Re E. Griffiths,
This paper is made freely available by the publisher.
This paper is made freely available by the publisher.

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Abstract

We present an analysis of X-ray variability in a flux limited sample of QSOs. Selected from our deep ROSAT survey, these QSOs span a wide range in redshift ($0.10.5$) do not show the anti-correlation with luminosity seen in local AGN. We speculate on the implications of these results for physical models of AGN and their evolution. Finally, we find evidence for X-ray variability in an object classified as a narrow emission-line galaxy, suggesting the presence of an AGN.