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Article: Transient X-ray emission from normal galactic nuclei

TitleTransient X-ray emission from normal galactic nuclei
Authors
KeywordsGalaxies: jets
Galaxies: nuclei
Radiation mechanisms: non-thermal
X-rays: galaxies
Issue Date2007
PublisherE D P Sciences. The Journal's web site is located at http://www.aanda.org
Citation
Astronomy And Astrophysics, 2007, v. 472 n. 1, p. 93-99 How to Cite?
AbstractX-ray transients appearing in optically non-active galactic nuclei have been observed in recent years. The most popular model explaining this kind of phenomena is the conventional tidal disruption model. In this model, when a star moves within the tidal radius of a black hole, part of the star materials will fall into the black hole through an accretion disk, which gives rise to the luminous flare. We propose that the X-ray emission may not necessarily come from radiation of the accretion disk alone. Instead, it may be related to a jet. As the jet travels in the interstellar medium, a shock is produced and synchrotron radiation is expected. We compared the model light curve and the synchrotron radiation spectrum with the observed data and find that our model explains the observed light curve and late-time spectrum well. Our model predicts that these transient active galactic nuclei could be sources for study by the future gamma-ray satellites, e.g. GLAST, and the emission region will be expanding with time. © ESO 2007.
Persistent Identifierhttp://hdl.handle.net/10722/80926
ISSN
2014 Impact Factor: 4.378
2015 SCImago Journal Rankings: 2.446
ISI Accession Number ID
References

 

DC FieldValueLanguage
dc.contributor.authorWong, AYLen_HK
dc.contributor.authorHuang, YFen_HK
dc.contributor.authorCheng, KSen_HK
dc.date.accessioned2010-09-06T08:11:49Z-
dc.date.available2010-09-06T08:11:49Z-
dc.date.issued2007en_HK
dc.identifier.citationAstronomy And Astrophysics, 2007, v. 472 n. 1, p. 93-99en_HK
dc.identifier.issn0004-6361en_HK
dc.identifier.urihttp://hdl.handle.net/10722/80926-
dc.description.abstractX-ray transients appearing in optically non-active galactic nuclei have been observed in recent years. The most popular model explaining this kind of phenomena is the conventional tidal disruption model. In this model, when a star moves within the tidal radius of a black hole, part of the star materials will fall into the black hole through an accretion disk, which gives rise to the luminous flare. We propose that the X-ray emission may not necessarily come from radiation of the accretion disk alone. Instead, it may be related to a jet. As the jet travels in the interstellar medium, a shock is produced and synchrotron radiation is expected. We compared the model light curve and the synchrotron radiation spectrum with the observed data and find that our model explains the observed light curve and late-time spectrum well. Our model predicts that these transient active galactic nuclei could be sources for study by the future gamma-ray satellites, e.g. GLAST, and the emission region will be expanding with time. © ESO 2007.en_HK
dc.languageengen_HK
dc.publisherE D P Sciences. The Journal's web site is located at http://www.aanda.orgen_HK
dc.relation.ispartofAstronomy and Astrophysicsen_HK
dc.subjectGalaxies: jetsen_HK
dc.subjectGalaxies: nucleien_HK
dc.subjectRadiation mechanisms: non-thermalen_HK
dc.subjectX-rays: galaxiesen_HK
dc.titleTransient X-ray emission from normal galactic nucleien_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=0004-6361&volume=472&spage=93&epage=99&date=2007&atitle=Transient+X-ray+emission+from+normal+galactic+nucleien_HK
dc.identifier.emailCheng, KS: hrspksc@hkucc.hku.hken_HK
dc.identifier.authorityCheng, KS=rp00675en_HK
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1051/0004-6361:20077222en_HK
dc.identifier.scopuseid_2-s2.0-34548312038en_HK
dc.identifier.hkuros133655en_HK
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-34548312038&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume472en_HK
dc.identifier.issue1en_HK
dc.identifier.spage93en_HK
dc.identifier.epage99en_HK
dc.identifier.isiWOS:000249758200011-
dc.publisher.placeFranceen_HK
dc.identifier.scopusauthoridWong, AYL=20437073100en_HK
dc.identifier.scopusauthoridHuang, YF=7501574835en_HK
dc.identifier.scopusauthoridCheng, KS=9745798500en_HK

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