Risaliti, G;
Salvati, M;
Elvis, M;
Fabiano, G;
Baldi, A;
Bianchi, S;
Braito, V;
... Zezas, A; + view all
(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.
Type: | Article |
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Title: | The XMM-Newton long look of NGC 1365: uncovering of the obscured X-ray source |
Open access status: | An open access version is available from UCL Discovery |
DOI: | 10.1111/j.1745-3933.2008.00580.x |
Publisher version: | http://dx.doi.org/10.1111/j.1745-3933.2008.00580.x |
Language: | English |
Additional information: | © 2009 RAS Definitive versions of articles pre-2013 are available at http://onlinelibrary.wiley.com/journal/10.1111/(ISSN)1365-2966, now published by http://mnras.oxfordjournals.org |
UCL classification: | UCL > Provost and Vice Provost Offices UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Space and Climate Physics |
URI: | https://discovery.ucl.ac.uk/id/eprint/43106 |
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