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Title: The XMM-Newton long look of NGC 1365: uncovering of the obscured X-raysource
Authors: Risaliti, Guido
Salvati, Marco
Elvis, Martin
Fabbiano, Giuseppina
Baldi, Alessandro
Bianchi, Stefano
Braito, Valentina
Guainazzi, Matteo
Matt, Giorgio
Miniutti, Giovanni
Reeves, James
Soria, Roberto
Zezas, Andreas
Issue Date: 2009
Publisher: Wiley-Blackwell
Abstract: We present an analysis of the extreme obscuration variability observedduring an XMM-Newton 5-d continuous monitoring of the active galacticnuclei (AGN) in NGC 1365. The source was in a reflection-dominatedstate in the first similar to 1.5 d, then a strong increase in the 7-10keV emission was observed in similar to 10 h, followed by a symmetricdecrease. The spectral analysis of the different states clearly showsthat this variation is due to an uncovering of the X-ray source. Fromthis observation, we estimate a size of the X-ray source D-S < 10(13)cm, a distance of the obscuring clouds R similar to 10(16) cm and adensity n similar to 10(11) cm(-3). These values suggest that the X-rayabsorption/reflection originates from the broad-line region clouds.This is also supported by the resolved width of the iron narrow K alphaemission line, consistent with the width of the broad H beta line.
ISSN: 0035-8711
DOI: 10.1111/j.1745-3933.2008.00580.x
Appears in Collections:A - Articolo su rivista
X_Dipartimento di Fisica 'Edoardo Amaldi'

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