Please use this identifier to cite or link to this item: http://hdl.handle.net/2307/296
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dc.contributor.authorYang, Yuxuan-
dc.contributor.authorWilson, Andrew S.-
dc.contributor.authorMatt, Giorgio-
dc.contributor.authorTerashima, Yuichi-
dc.contributor.authorGreenhill, Lincoln J.-
dc.date.accessioned2010-07-12T10:46:00Z-
dc.date.available2010-07-12T10:46:00Z-
dc.date.issued2009-01-20-
dc.identifier.issn0004-637X-
dc.identifier.urihttp://hdl.handle.net/2307/296-
dc.description.abstractWe report Suzaku observations of the active, Compton-thick Circinus galaxy. Observations were obtained with both the X-ray imaging spectrometer (XIS) and the hard X-ray detector (HXD). Below 10 keV, the nuclear spectrum is dominated by radiation reflected from cold dense gas of high column density, while above 13 keV the radiation is directly transmitted nuclear emission seen through a column density of similar or equal to 4 x 10(24) cm(-2). In the 0.2-10 keV band, the XIS spectrum is contaminated at 5% level by the brightest off-nuclear source in Circinus, but drops to 1% in the 5-10 keV band and is negligible at higher energies. We find no significant evidence for variability in the hard (> 12 keV) emission. Circinus is marginally detected with the HXD/GSO in the 50-100 keV band at 2.5 sigma level. We model the 3-70 keV band XIS+PIN spectra with four components: the Compton transmitted nuclear emission, the reflected nuclear emission, a soft power law (representing a combination of scattered nuclear emission, extended emission, and contamination by sources in the galaxy below a few keV), and emission lines. The hard nuclear power law is found to have a photon index Gamma(h) similar or equal to 1.6, very similar to the soft power law. The high-energy cutoff is E-C similar or equal to 49 keV. These results agree with those from BeppoSAX. An extrapolation of this model up to the GSO band shows good agreement with the GSO spectrum and supports our detection of Circinus up to similar or equal to 100 keV.en
dc.language.isoenen
dc.publisherIOP Publishingen
dc.relation.ispartofAstrophysical Journalen
dc.rightsThe American Astronomical Societyen
dc.subjectX-RAY SPECTROSCOPYen
dc.subjectSEYFERT 2 GALAXIESen
dc.subjectGALACTIC RIDGEen
dc.subjectCHANDRAen
dc.subjectNGC-4945en
dc.subjectEMISSIONen
dc.subjectSPECTRUMen
dc.subjectBEPPOSAXen
dc.subjectREGIONen
dc.subjectAGNen
dc.titleSuzaku observations of the Circinus galaxyen
dc.typeArticleen
dc.subject.miurSettori Disciplinari MIUR::Scienze fisiche::ASTRONOMIA E ASTROFISICAen
dc.subject.isicruiCategorie ISI-CRUI::Scienze fisiche::Physicsen
dc.subject.anagraferoma3Scienze fisicheen
dc.relation.volumenumber691en
dc.relation.pagenumber131-139en
dc.identifier.doi10.1088/0004-637X/691/1/131-
dc.relation.issuenumber1en
item.languageiso639-1other-
item.fulltextWith Fulltext-
item.grantfulltextrestricted-
Appears in Collections:A - Articolo su rivista
X_Dipartimento di Fisica 'Edoardo Amaldi'
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