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'

Files in This Item:
File Description SizeFormat Existing users please Login
astrongexcess.pdf482.65 kBAdobe PDF    Request a copy
Show full item record Recommend this item

Page view(s)

85
Last Week
0
Last month
2
checked on May 20, 2024

Download(s)

12
checked on May 20, 2024

Google ScholarTM

Check

Altmetric

Altmetric


Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.