Risaliti, G; Salvati, M; Elvis, M; Fabiano, G; Baldi, A; Bianchi, S; Braito, V; ... Zezas, A; + view all Risaliti, G; Salvati, M; Elvis, M; Fabiano, G; Baldi, A; Bianchi, S; Braito, V; Guainazzi, M; Matt, G; Miniutti, G; Reeves, J; SORIA, R; Zezas, A; - view fewer (2009) The XMM-Newton long look of NGC 1365: uncovering of the obscured X-ray source. Monthly Notices of the Royal Astronomical Society: Letters , 393 L1 - L5. 10.1111/j.1745-3933.2008.00580.x.

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Abstract

We present an analysis of the extreme obscuration variability observed during an XMM–Newton 5-d continuous monitoring of the active galactic nuclei (AGN) in NGC 1365. The source was in a reflection-dominated state in the first ∼1.5 d, then a strong increase in the 7–10 keV emission was observed in ∼10 h, followed by a symmetric decrease. The spectral analysis of the different states clearly shows that this variation is due to an uncovering of the X-ray source. From this observation, we estimate a size of the X-ray source DS < 1013 cm, a distance of the obscuring clouds R∼ 1016 cm and a density n∼ 1011 cm−3. These values suggest that the X-ray absorption/reflection originates from the broad-line region clouds. This is also supported by the resolved width of the iron narrow Kα emission line, consistent with the width of the broad Hβ line.

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