Variability in X-ray absorption: a universal feature in AGNs

Details Variability in X-ray absorption: a universal feature in AGNs Variability in X-ray absorption: a universal feature in AGNs

Dec 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000aas...197.3907r&link_type=abstract

American Astronomical Society, 197th AAS Meeting, #39.07; Bulletin of the American Astronomical Society, Vol. 32, p.1457

Astronomy and Astrophysics

Astronomy

Scientific paper

We present an analysis of the variation of X-ray absorbing column density in a large sample of Seyfert 2 galaxies. We find that almost all of the sources with multiple X-ray observations show variability in NH on time scales from months to a few years. The lack of correlation between NH and soft X-ray light curves flux suggests that variability of NH is not due to changes in the photoionizing central emission, but most likely is related to variations of the amount of obscuring gas along the line of sight. We discuss the consequences of these results for models of the structure of the circumnuclear regions in AGNs.

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