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Article: Capture of a red giant by the black hole Sagittarius A* as a possible origin for the TeV gamma rays from the galactic center

TitleCapture of a red giant by the black hole Sagittarius A* as a possible origin for the TeV gamma rays from the galactic center
Authors
KeywordsAccretion, Accretion Disks
Black Hole Physics
Galaxies: Active
Galaxies: Jets
Galaxy: Center
Issue Date2006
PublisherInstitute of Physics Publishing Ltd. The Journal's web site is located at http://iopscience.iop.org/2041-8205
Citation
Astrophysical Journal Letters, 2006, v. 641 n. 1 I, p. 288-292 How to Cite?
AbstractNonthermal TeV γ-ray emission within a multiparsec scale has been observed from the center region of our Galaxy. We argue that these γ-rays are the result of transient activity of the massive black hole Sgr A* that resides at the Galactic center. Several thousand years ago, the black hole may have experienced an active phase by capturing a red giant star and forming an accretion disk, temporarily behaving like an active galactic nucleus. A powerful jet, which contains plenty of high-speed protons, was launched during the process. These runaway protons interact with the dense ambient medium, producing TeV γ-ray emission through the π0-decay process. We show that the total energy deposited in this way is large enough to account for observations. The diffusion length of protons is also consistent with the observed size of the TeV source. © 2006. The American Astronomical Society. All rights reserved.
Persistent Identifierhttp://hdl.handle.net/10722/175019
ISSN
2015 Impact Factor: 5.487
2015 SCImago Journal Rankings: 3.369
ISI Accession Number ID
References

 

DC FieldValueLanguage
dc.contributor.authorLu, Yen_US
dc.contributor.authorCheng, KSen_US
dc.contributor.authorHuang, YFen_US
dc.date.accessioned2012-11-26T08:48:47Z-
dc.date.available2012-11-26T08:48:47Z-
dc.date.issued2006en_US
dc.identifier.citationAstrophysical Journal Letters, 2006, v. 641 n. 1 I, p. 288-292en_US
dc.identifier.issn2041-8205en_US
dc.identifier.urihttp://hdl.handle.net/10722/175019-
dc.description.abstractNonthermal TeV γ-ray emission within a multiparsec scale has been observed from the center region of our Galaxy. We argue that these γ-rays are the result of transient activity of the massive black hole Sgr A* that resides at the Galactic center. Several thousand years ago, the black hole may have experienced an active phase by capturing a red giant star and forming an accretion disk, temporarily behaving like an active galactic nucleus. A powerful jet, which contains plenty of high-speed protons, was launched during the process. These runaway protons interact with the dense ambient medium, producing TeV γ-ray emission through the π0-decay process. We show that the total energy deposited in this way is large enough to account for observations. The diffusion length of protons is also consistent with the observed size of the TeV source. © 2006. The American Astronomical Society. All rights reserved.en_US
dc.languageengen_US
dc.publisherInstitute of Physics Publishing Ltd. The Journal's web site is located at http://iopscience.iop.org/2041-8205en_US
dc.relation.ispartofAstrophysical Journal Lettersen_US
dc.subjectAccretion, Accretion Disksen_US
dc.subjectBlack Hole Physicsen_US
dc.subjectGalaxies: Activeen_US
dc.subjectGalaxies: Jetsen_US
dc.subjectGalaxy: Centeren_US
dc.titleCapture of a red giant by the black hole Sagittarius A* as a possible origin for the TeV gamma rays from the galactic centeren_US
dc.typeArticleen_US
dc.identifier.emailCheng, KS: hrspksc@hkucc.hku.hken_US
dc.identifier.authorityCheng, KS=rp00675en_US
dc.description.naturelink_to_subscribed_fulltexten_US
dc.identifier.doi10.1086/500359en_US
dc.identifier.scopuseid_2-s2.0-33745300213en_US
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-33745300213&selection=ref&src=s&origin=recordpageen_US
dc.identifier.volume641en_US
dc.identifier.issue1 Ien_US
dc.identifier.spage288en_US
dc.identifier.epage292en_US
dc.identifier.isiWOS:000236817800022-
dc.publisher.placeUnited Kingdomen_US
dc.identifier.scopusauthoridLu, Y=7405476987en_US
dc.identifier.scopusauthoridCheng, KS=9745798500en_US
dc.identifier.scopusauthoridHuang, YF=24448042100en_US

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