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Conference Paper: Cosmic-ray production and x-ray and gamma-ray emission from the galactic center

TitleCosmic-ray production and x-ray and gamma-ray emission from the galactic center
Authors
KeywordsGalactic Center
Gamma-Rays
X-Rays
Issue Date2009
PublisherInstitute of Pure and Applied Physics. The Journal's web site is located at http://www.ipap.jp/jpsj/index.htm
Citation
Journal Of The Physical Society Of Japan, 2009, v. 78 SUPPL. A, p. 133-137 How to Cite?
AbstractWe assume that the energy source in the Galactic Center is the black hole Sgr A, which becomes active when a star is captured in a rate of ∼ 10-5yr-1. During the active phase relativistic protons with a characteristic energy ∼ 6 x 1052erg per capture are ejected. We suppose that the annihilation of secondary positrons produced by proton-proton collisions is observed as the 511 keV line flux from the Galactic bulge. Though these positron are generated with relatively high energies (> 30 MeV), our model satisfy the criterion derived by Beacom and Yiiksel based on the COMPTEL data in the range 1-30 MeV. From our estimations it follows also that a flux of gamma-ray de-excitation lines ∼ 2.5 x 10-5 ph cm-2 s-1 in the range below 8 MeV is produced by the relativistic protons in the Galactic center. A specific line is the one at 1.809 MeV from radioactivity of 26 Al. The predicted quasi-stationary flux of the 26Al 1.809 MeV line from the 1° x 1 central region is < 10-6 ph cm-2 s-1. We conclude also the the thermal 6.5 keV X-ray flux and the non-thermal hard X-ray flux in the range 14-40 keV observed by SUZAKU is emitted by subrelativistic protons produced by accretion processes. © 2009 The Physical Society of Japan.
Persistent Identifierhttp://hdl.handle.net/10722/176199
ISSN
2015 Impact Factor: 1.559
2015 SCImago Journal Rankings: 0.720
References

 

DC FieldValueLanguage
dc.contributor.authorDogiel, VAen_US
dc.contributor.authorCheng, KSen_US
dc.contributor.authorChernyshoy, DOen_US
dc.contributor.authorTatisoheff, Ven_US
dc.contributor.authorKo, CMen_US
dc.contributor.authorIp, WHen_US
dc.contributor.authorKokubun, Men_US
dc.contributor.authorMaeda, Yen_US
dc.contributor.authorMitsuda, Ken_US
dc.date.accessioned2012-11-26T09:06:49Z-
dc.date.available2012-11-26T09:06:49Z-
dc.date.issued2009en_US
dc.identifier.citationJournal Of The Physical Society Of Japan, 2009, v. 78 SUPPL. A, p. 133-137en_US
dc.identifier.issn0031-9015en_US
dc.identifier.urihttp://hdl.handle.net/10722/176199-
dc.description.abstractWe assume that the energy source in the Galactic Center is the black hole Sgr A, which becomes active when a star is captured in a rate of ∼ 10-5yr-1. During the active phase relativistic protons with a characteristic energy ∼ 6 x 1052erg per capture are ejected. We suppose that the annihilation of secondary positrons produced by proton-proton collisions is observed as the 511 keV line flux from the Galactic bulge. Though these positron are generated with relatively high energies (> 30 MeV), our model satisfy the criterion derived by Beacom and Yiiksel based on the COMPTEL data in the range 1-30 MeV. From our estimations it follows also that a flux of gamma-ray de-excitation lines ∼ 2.5 x 10-5 ph cm-2 s-1 in the range below 8 MeV is produced by the relativistic protons in the Galactic center. A specific line is the one at 1.809 MeV from radioactivity of 26 Al. The predicted quasi-stationary flux of the 26Al 1.809 MeV line from the 1° x 1 central region is < 10-6 ph cm-2 s-1. We conclude also the the thermal 6.5 keV X-ray flux and the non-thermal hard X-ray flux in the range 14-40 keV observed by SUZAKU is emitted by subrelativistic protons produced by accretion processes. © 2009 The Physical Society of Japan.en_US
dc.languageengen_US
dc.publisherInstitute of Pure and Applied Physics. The Journal's web site is located at http://www.ipap.jp/jpsj/index.htmen_US
dc.relation.ispartofJournal of the Physical Society of Japanen_US
dc.subjectGalactic Centeren_US
dc.subjectGamma-Raysen_US
dc.subjectX-Raysen_US
dc.titleCosmic-ray production and x-ray and gamma-ray emission from the galactic centeren_US
dc.typeConference_Paperen_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.scopuseid_2-s2.0-66849084286en_US
dc.identifier.hkuros241836-
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-66849084286&selection=ref&src=s&origin=recordpageen_US
dc.identifier.volume78en_US
dc.identifier.issueSUPPL. Aen_US
dc.identifier.spage133en_US
dc.identifier.epage137en_US
dc.publisher.placeJapanen_US
dc.identifier.scopusauthoridDogiel, VA=6603566238en_US
dc.identifier.scopusauthoridCheng, KS=9745798500en_US
dc.identifier.scopusauthoridChernyshoy, DO=26644796600en_US
dc.identifier.scopusauthoridTatisoheff, V=26645251300en_US
dc.identifier.scopusauthoridKo, CM=7202596730en_US
dc.identifier.scopusauthoridIp, WH=26644885700en_US
dc.identifier.scopusauthoridKokubun, M=7006798464en_US
dc.identifier.scopusauthoridMaeda, Y=7402845669en_US
dc.identifier.scopusauthoridMitsuda, K=7005132297en_US

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