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Article: Restrictions on the injection energy of positrons annihilating near the Galactic Centre
Title | Restrictions on the injection energy of positrons annihilating near the Galactic Centre | ||||||||||||
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Authors | |||||||||||||
Keywords | Galaxy: centre Gamma-rays: theory Radiation mechanisms: non-thermal | ||||||||||||
Issue Date | 2010 | ||||||||||||
Publisher | Blackwell 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? | ||||||||||||
Abstract | The 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 Identifier | http://hdl.handle.net/10722/125289 | ||||||||||||
ISSN | 2023 Impact Factor: 4.7 2023 SCImago Journal Rankings: 1.621 | ||||||||||||
ISI Accession Number ID |
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 Field | Value | Language |
---|---|---|
dc.contributor.author | Chernyshov, DO | en_HK |
dc.contributor.author | Cheng, KS | en_HK |
dc.contributor.author | Dogiel, VA | en_HK |
dc.contributor.author | Ko, CM | en_HK |
dc.contributor.author | Ip, WH | en_HK |
dc.date.accessioned | 2010-10-31T11:22:28Z | - |
dc.date.available | 2010-10-31T11:22:28Z | - |
dc.date.issued | 2010 | en_HK |
dc.identifier.citation | Monthly Notices Of The Royal Astronomical Society, 2010, v. 403 n. 2, p. 817-825 | en_HK |
dc.identifier.issn | 0035-8711 | en_HK |
dc.identifier.uri | http://hdl.handle.net/10722/125289 | - |
dc.description.abstract | The 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.language | eng | en_HK |
dc.publisher | Blackwell Publishing Ltd. The Journal's web site is located at http://www.blackwellpublishing.com/journals/MNR | en_HK |
dc.relation.ispartof | Monthly Notices of the Royal Astronomical Society | en_HK |
dc.rights | The definitive version is available at www.blackwell-synergy.com | - |
dc.subject | Galaxy: centre | en_HK |
dc.subject | Gamma-rays: theory | en_HK |
dc.subject | Radiation mechanisms: non-thermal | en_HK |
dc.title | Restrictions on the injection energy of positrons annihilating near the Galactic Centre | en_HK |
dc.type | Article | en_HK |
dc.identifier.openurl | http://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+Centre | en_HK |
dc.identifier.email | Cheng, KS: hrspksc@hkucc.hku.hk | en_HK |
dc.identifier.authority | Cheng, KS=rp00675 | en_HK |
dc.description.nature | link_to_OA_fulltext | - |
dc.identifier.doi | 10.1111/j.1365-2966.2010.16154.x | en_HK |
dc.identifier.scopus | eid_2-s2.0-77952561668 | en_HK |
dc.identifier.hkuros | 180325 | en_HK |
dc.relation.references | http://www.scopus.com/mlt/select.url?eid=2-s2.0-77952561668&selection=ref&src=s&origin=recordpage | en_HK |
dc.identifier.volume | 403 | en_HK |
dc.identifier.issue | 2 | en_HK |
dc.identifier.spage | 817 | en_HK |
dc.identifier.epage | 825 | en_HK |
dc.identifier.isi | WOS:000275760900020 | - |
dc.publisher.place | United Kingdom | en_HK |
dc.identifier.scopusauthorid | Chernyshov, DO=14059433800 | en_HK |
dc.identifier.scopusauthorid | Cheng, KS=9745798500 | en_HK |
dc.identifier.scopusauthorid | Dogiel, VA=6603566238 | en_HK |
dc.identifier.scopusauthorid | Ko, CM=7202596730 | en_HK |
dc.identifier.scopusauthorid | Ip, WH=26644885700 | en_HK |
dc.identifier.citeulike | 6921048 | - |
dc.identifier.issnl | 0035-8711 | - |