Please use this identifier to cite or link to this item: http://hdl.handle.net/2307/393
Title: A strong excess in the 20-100 kev emission of ngc 1365
Authors: Risaliti, G.
Braito, V.
Laparola, V.
Bianchi, Stefano
Elvis, M.
Fabbiano, G.
Maiolino, R.
Matt, Giorgio
Reeves, J.
Salvati, M.
Wang, J.
Keywords: ACTIVE GALACTIC NUCLEUS
HARD X-RAYS
CHANDRA
TRANSMISSION
DISCOVERY
GALAXY
AGN
Issue Date: Nov-2009
Publisher: IOP Publishing LTD
Abstract: We present a new Suzaku observation of the obscured active galacticnucleus in NGC 1365, revealing an unexpected excess of X-rays above 20keV of at least a factor similar to 2 with respect to the extrapolationof the best-fitting 3-10 keV model. Additional Swift-BAT andIntegral-IBIS observations show that the 20-100 keV is concentratedwithin similar to 1.5 arcmin from the center of the galaxy, and is notsignificantly variable on timescales from days to years. A comparisonof this component with the 3-10 keV emission, which is characterized bya rapidly variable absorption, suggests a complex structure of thecircumnuclear medium, consisting of at least two distinct componentswith rather different physical properties, one of which covers >80% ofthe source with a column density N-H similar to 3-4x10(24) cm(-2). Analternative explanation is the presence of a double active nucleus inthe center of NGC 1365.
URI: http://hdl.handle.net/2307/393
DOI: 10.1088/0004-637X/705/1/L1
Appears in Collections:A - Articolo su rivista
X_Dipartimento di Fisica 'Edoardo Amaldi'

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