X-ray Absorption Variability In Ngc 4507

Details X-ray Absorption Variability In Ngc 4507 X-ray Absorption Variability In Ngc 4507

May 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21822816m&link_type=abstract

American Astronomical Society, AAS Meeting #218, #228.16; Bulletin of the American Astronomical Society, Vol. 43, 2011

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Scientific paper

We present a complete spectral analysis of an XMM-Newton and Chandra campaign of the obscured AGN in NGC 4507, consisting of six observations spanning a period of six months. We detect strong absorption variability on time scales between 1.5 and 4 months, suggesting that the obscuring material consists of gas clouds at parsec-scale distance. The lack of variability on shorter time scales rules out the possibility of absorption by broad line region clouds, which was instead found in other studies of similar sources. This shows that a single, universal structure of the absorber (either BLR clouds, or the parsec-scale torus) is not enough to reproduce the observed complexity of the X-ray absorption features of AGNs.

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