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Article: Origin of the Fermi bubble

TitleOrigin of the Fermi bubble
Authors
Keywordsblack hole physics
galaxies: jets
Galaxy: halo
radiation mechanisms: non-thermal
Issue Date2011
PublisherInstitute of Physics Publishing Ltd. The Journal's web site is located at http://iopscience.iop.org/2041-8205
Citation
Astrophysical Journal Letters, 2011, v. 731 n. 1 PART II How to Cite?
AbstractFermi has discovered two giant gamma-ray-emitting bubbles that extend nearly 10kpc in diameter north and south of the Galactic center. The existence of the bubbles was first evidenced in X-rays detected by ROSAT and later WMAP detected an excess of radio signals at the location of the gamma-ray bubbles. We propose that periodic star capture processes by the galactic supermassive black hole, Sgr A*, with a capture rate 3 × 10 -5 yr -1 and energy release ∼3 × 10 52 erg per capture can produce very hot plasma ∼10 keV with a wind velocity ∼10 8 cm s -1 injected into the halo and heat up the halo gas to ∼1 keV, which produces thermal X-rays. The periodic injection of hot plasma can produce shocks in the halo and accelerate electrons to ∼TeV, which produce radio emission via synchrotron radiation and gamma rays via inverse Compton scattering with the relic and the galactic soft photons. © 2011. The American Astronomical Society. All rights reserved.
Persistent Identifierhttp://hdl.handle.net/10722/133300
ISSN
2015 Impact Factor: 5.487
2015 SCImago Journal Rankings: 3.369
ISI Accession Number ID
Funding AgencyGrant Number
NSC-RFBRRP09N04
09-02-92000-HHC-a
National Science Council, TaiwanNSC 98-2923-M-008-001-MY3
NSC 99-2112-M-008-015-MY3
HKU7011/10p
Funding Information:

We thank the anonymous referee for very useful suggestions. K. S. C. is supported by a grant under HKU7011/10p. V. A. D. and D.O.C. are partly supported by the NSC-RFBR Joint Research Project RP09N04 and 09-02-92000-HHC-a. C. M. K. thanks S. Kwok for his hospitality at HKU. C. M. K. is supported in part by the National Science Council, Taiwan, under grants NSC 98-2923-M-008-001-MY3 and NSC 99-2112-M-008-015-MY3.

References

 

DC FieldValueLanguage
dc.contributor.authorCheng, KSen_HK
dc.contributor.authorChernyshov, DOen_HK
dc.contributor.authorDogiel, VAen_HK
dc.contributor.authorKo, CMen_HK
dc.contributor.authorIp, WHen_HK
dc.date.accessioned2011-05-09T04:49:06Z-
dc.date.available2011-05-09T04:49:06Z-
dc.date.issued2011en_HK
dc.identifier.citationAstrophysical Journal Letters, 2011, v. 731 n. 1 PART IIen_HK
dc.identifier.issn2041-8205en_HK
dc.identifier.urihttp://hdl.handle.net/10722/133300-
dc.description.abstractFermi has discovered two giant gamma-ray-emitting bubbles that extend nearly 10kpc in diameter north and south of the Galactic center. The existence of the bubbles was first evidenced in X-rays detected by ROSAT and later WMAP detected an excess of radio signals at the location of the gamma-ray bubbles. We propose that periodic star capture processes by the galactic supermassive black hole, Sgr A*, with a capture rate 3 × 10 -5 yr -1 and energy release ∼3 × 10 52 erg per capture can produce very hot plasma ∼10 keV with a wind velocity ∼10 8 cm s -1 injected into the halo and heat up the halo gas to ∼1 keV, which produces thermal X-rays. The periodic injection of hot plasma can produce shocks in the halo and accelerate electrons to ∼TeV, which produce radio emission via synchrotron radiation and gamma rays via inverse Compton scattering with the relic and the galactic soft photons. © 2011. The American Astronomical Society. All rights reserved.en_HK
dc.languageeng-
dc.publisherInstitute of Physics Publishing Ltd. The Journal's web site is located at http://iopscience.iop.org/2041-8205en_HK
dc.relation.ispartofAstrophysical Journal Lettersen_HK
dc.rightsThe Astrophysical Journal Letters. Copyright © Institute of Physics Publishing Ltd.-
dc.rightsCreative Commons: Attribution 3.0 Hong Kong License-
dc.subjectblack hole physicsen_HK
dc.subjectgalaxies: jetsen_HK
dc.subjectGalaxy: haloen_HK
dc.subjectradiation mechanisms: non-thermalen_HK
dc.titleOrigin of the Fermi bubbleen_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=2041-8205&volume=731&issue=1, article no.L17&spage=&epage=&date=2011&atitle=Origin+of+the+Fermi+bubble-
dc.identifier.emailCheng, KS: hrspksc@hkucc.hku.hken_HK
dc.identifier.authorityCheng, KS=rp00675en_HK
dc.description.naturepostprint-
dc.identifier.doi10.1088/2041-8205/731/1/L17en_HK
dc.identifier.scopuseid_2-s2.0-79955606191en_HK
dc.identifier.hkuros184988-
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-79955606191&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume731en_HK
dc.identifier.issue1 PART IIen_HK
dc.identifier.eissn2041-8213-
dc.identifier.isiWOS:000293126600017-
dc.publisher.placeUnited Kingdomen_HK
dc.identifier.scopusauthoridCheng, KS=9745798500en_HK
dc.identifier.scopusauthoridChernyshov, DO=14059433800en_HK
dc.identifier.scopusauthoridDogiel, VA=6603566238en_HK
dc.identifier.scopusauthoridKo, CM=7202596730en_HK
dc.identifier.scopusauthoridIp, WH=26644885700en_HK

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