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Conference Paper: Particle acceleration and the origin of gamma-ray emission from Fermi Bubbles

TitleParticle acceleration and the origin of gamma-ray emission from Fermi Bubbles
Authors
KeywordsGalaxy: halo
Radiation mechanisms: non-thermal
Acceleration of particles
Shock waves
Issue Date2011
PublisherICRC2011.
Citation
The 32nd International Cosmic Ray Conference (ICRC2011), Beijing, China, 11-18 August 2011. In Proceedings of ICRC2011 How to Cite?
AbstractFermi LAT has discovered two extended gamma-ray bubbles above and below the galactic plane. We propose that their origin is due to the energy release in the Galactic center (GC) as a result of quasi-periodic star accretion onto the central black hole. Shocks generated by these processes propagate into the Galactic halo and accelerate particles there. We show that electrons accelerated up to 10 TeV may be responsible for the observed gamma-ray emission of the bubbles as a result of inverse Compton (IC) scattering on the relic photons. We also suggest that the Bubble could generate the flux of CR protons at energies > 10(15) eV because the shocks in the Bubble have much larger length scales and longer lifetimes in comparison with those in SNRs. This may explain the CR spectrum above the knee.
Persistent Identifierhttp://hdl.handle.net/10722/145613

 

DC FieldValueLanguage
dc.contributor.authorChernyshov, Den_US
dc.contributor.authorCheng, KSen_US
dc.contributor.authorDogel, Ven_US
dc.contributor.authorKo, CMen_US
dc.contributor.authorIp, WHen_US
dc.contributor.authorWang, Yen_US
dc.date.accessioned2012-02-28T01:58:17Z-
dc.date.available2012-02-28T01:58:17Z-
dc.date.issued2011en_US
dc.identifier.citationThe 32nd International Cosmic Ray Conference (ICRC2011), Beijing, China, 11-18 August 2011. In Proceedings of ICRC2011en_US
dc.identifier.urihttp://hdl.handle.net/10722/145613-
dc.description.abstractFermi LAT has discovered two extended gamma-ray bubbles above and below the galactic plane. We propose that their origin is due to the energy release in the Galactic center (GC) as a result of quasi-periodic star accretion onto the central black hole. Shocks generated by these processes propagate into the Galactic halo and accelerate particles there. We show that electrons accelerated up to 10 TeV may be responsible for the observed gamma-ray emission of the bubbles as a result of inverse Compton (IC) scattering on the relic photons. We also suggest that the Bubble could generate the flux of CR protons at energies > 10(15) eV because the shocks in the Bubble have much larger length scales and longer lifetimes in comparison with those in SNRs. This may explain the CR spectrum above the knee.-
dc.languageengen_US
dc.publisherICRC2011.-
dc.relation.ispartofProceedings of ICRC2011en_US
dc.rightsThis work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.-
dc.subjectGalaxy: halo-
dc.subjectRadiation mechanisms: non-thermal-
dc.subjectAcceleration of particles-
dc.subjectShock waves-
dc.titleParticle acceleration and the origin of gamma-ray emission from Fermi Bubblesen_US
dc.typeConference_Paperen_US
dc.identifier.emailChernyshov, D: chdmit@hku.hken_US
dc.identifier.emailCheng, KS: hrspksc@hkucc.hku.hken_US
dc.identifier.emailDogel, V: dogiel@bohr.physics.hku.hken_US
dc.identifier.emailKo, CM: cmko@hku.hken_US
dc.identifier.emailWang, Y: yuwang20@hku.hken_US
dc.identifier.authorityCheng, KS=rp00675en_US
dc.description.naturepostprint-
dc.identifier.hkuros198657en_US
dc.description.otherThe 32nd International Cosmic Ray Conference (ICRC2011), Beijing, China, 11-18 August 2011. In Proceedings of ICRC2011-

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