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Article: Restrictions on the injection energy of positrons annihilating near the Galactic Centre

TitleRestrictions on the injection energy of positrons annihilating near the Galactic Centre
Authors
KeywordsGalaxy: centre
Gamma-rays: theory
Radiation mechanisms: non-thermal
Issue Date2010
PublisherBlackwell Publishing Ltd. The Journal's web site is located at http://www.blackwellpublishing.com/journals/MNR
Citation
Monthly Notices Of The Royal Astronomical Society, 2010, v. 403 n. 2, p. 817-825 How to Cite?
AbstractThe origin and properties of the source of positrons annihilating in the Galactic Centre (GC) are still a mystery. One of the criteria that may discriminate between different mechanisms of positron production there is the injection energy of positrons. Beacom and Yüksel suggested a method to estimate this energy from the ratio of the 511-keV line to the MeV in-flight annihilation fluxes. From COMPTEL data, they derived that the maximum injection energy of positrons should be about several MeV. This significantly decreased the class of models of the positron origin in the GC, assuming that positrons lose their energy through Coulomb collisions only. However, observations show that the strength of the magnetic field in the GC is much higher than in other parts of the Galaxy; in the GC, it may range from 100 μG to several mG. In these conditions, the synchrotron losses of positrons are significant and this extends the range of acceptable values of the injection energy of positrons. We show that if positron injection in the GC is non-stationary and the magnetic field is higher than 0.4 mG, both radio and gamma-ray restrictions permit the energy to be higher than several GeV. © 2010 The Authors. Journal compilation © 2010 RAS.
Persistent Identifierhttp://hdl.handle.net/10722/125289
ISSN
2015 Impact Factor: 4.952
2015 SCImago Journal Rankings: 2.806
ISI Accession Number ID
Funding AgencyGrant Number
RFBR
NSC-RFBRRP09N04
09-02-92000-HHC-a
President of the Russian Federation 'Scientific School of Academician V. L. Ginzburg
Hong Kong Government
Taiwan National Science CouncilNSC 96-2112-M-008-014-MY3
NSC 98-2923-M-008-001-MY3
NSC 96-2752-M-008-011-PAE
NSC 96-2111-M-008-010
Funding Information:

DOC and VAD are partly supported by the RFBR grant 08-02-00170-a, the NSC-RFBR Joint Research Project RP09N04 and 09-02-92000-HHC-a and by a grant from the President of the Russian Federation 'Scientific School of Academician V. L. Ginzburg'. KSC is supported by a GRF grant from the Hong Kong Government. CMK is supported by the Taiwan National Science Council grants, NSC 96-2112-M-008-014-MY3 and NSC 98-2923-M-008-001-MY3. WHI is supported by the Taiwan National Science Council grants, NSC 96-2752-M-008-011-PAE and NSC 96-2111-M-008-010. We would like to mention that the referee's report was very useful, and we would like to thank the referee for the helpful comments. DOC and VAD thank the Institute of Astronomy, National Central University, for the hospitality during their stay there.

References

 

DC FieldValueLanguage
dc.contributor.authorChernyshov, DOen_HK
dc.contributor.authorCheng, KSen_HK
dc.contributor.authorDogiel, VAen_HK
dc.contributor.authorKo, CMen_HK
dc.contributor.authorIp, WHen_HK
dc.date.accessioned2010-10-31T11:22:28Z-
dc.date.available2010-10-31T11:22:28Z-
dc.date.issued2010en_HK
dc.identifier.citationMonthly Notices Of The Royal Astronomical Society, 2010, v. 403 n. 2, p. 817-825en_HK
dc.identifier.issn0035-8711en_HK
dc.identifier.urihttp://hdl.handle.net/10722/125289-
dc.description.abstractThe origin and properties of the source of positrons annihilating in the Galactic Centre (GC) are still a mystery. One of the criteria that may discriminate between different mechanisms of positron production there is the injection energy of positrons. Beacom and Yüksel suggested a method to estimate this energy from the ratio of the 511-keV line to the MeV in-flight annihilation fluxes. From COMPTEL data, they derived that the maximum injection energy of positrons should be about several MeV. This significantly decreased the class of models of the positron origin in the GC, assuming that positrons lose their energy through Coulomb collisions only. However, observations show that the strength of the magnetic field in the GC is much higher than in other parts of the Galaxy; in the GC, it may range from 100 μG to several mG. In these conditions, the synchrotron losses of positrons are significant and this extends the range of acceptable values of the injection energy of positrons. We show that if positron injection in the GC is non-stationary and the magnetic field is higher than 0.4 mG, both radio and gamma-ray restrictions permit the energy to be higher than several GeV. © 2010 The Authors. Journal compilation © 2010 RAS.en_HK
dc.languageengen_HK
dc.publisherBlackwell Publishing Ltd. The Journal's web site is located at http://www.blackwellpublishing.com/journals/MNRen_HK
dc.relation.ispartofMonthly Notices of the Royal Astronomical Societyen_HK
dc.rightsThe definitive version is available at www.blackwell-synergy.com-
dc.subjectGalaxy: centreen_HK
dc.subjectGamma-rays: theoryen_HK
dc.subjectRadiation mechanisms: non-thermalen_HK
dc.titleRestrictions on the injection energy of positrons annihilating near the Galactic Centreen_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=0035-8711&volume=403&issue=2&spage=817&epage=825&date=2010&atitle=Restrictions+on+the+injection+energy+of+positrons+annihilating+near+the+Galactic+Centreen_HK
dc.identifier.emailCheng, KS: hrspksc@hkucc.hku.hken_HK
dc.identifier.authorityCheng, KS=rp00675en_HK
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1111/j.1365-2966.2010.16154.xen_HK
dc.identifier.scopuseid_2-s2.0-77952561668en_HK
dc.identifier.hkuros180325en_HK
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-77952561668&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume403en_HK
dc.identifier.issue2en_HK
dc.identifier.spage817en_HK
dc.identifier.epage825en_HK
dc.identifier.isiWOS:000275760900020-
dc.publisher.placeUnited Kingdomen_HK
dc.identifier.scopusauthoridChernyshov, DO=14059433800en_HK
dc.identifier.scopusauthoridCheng, KS=9745798500en_HK
dc.identifier.scopusauthoridDogiel, VA=6603566238en_HK
dc.identifier.scopusauthoridKo, CM=7202596730en_HK
dc.identifier.scopusauthoridIp, WH=26644885700en_HK
dc.identifier.citeulike6921048-

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