Journal
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Volume 429, Issue 3, Pages 2581-2586Publisher
OXFORD UNIV PRESS
DOI: 10.1093/mnras/sts534
Keywords
Galaxies: active; Galaxies: Seyfert
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Funding
- NASA [NNX11AC85G, GO2-13124X]
- NASA [149302, NNX11AC85G] Funding Source: Federal RePORTER
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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, ranging from 2010 June to December. 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 significant variability on shorter time-scales suggests that this event is not due to absorption by broad-line region (BLR) 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 this AGN.
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