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Conference Paper: Restrictions on the injection energy of positrons annihilating near the Galactic center

TitleRestrictions on the injection energy of positrons annihilating near the Galactic center
Authors
KeywordsCompact sources
Galactic Center
Galactic Center region
Initial energy
Injection energy
Injection spectra
Line emissions
Issue Date2008
PublisherScuola Internazionale Superiore di Studi Avanzati (SISSA). The Journal's web site is located at http://pos.sissa.it
Citation
The 7th Integral Workshop, Copenhagen, Denmark, 8-11 September 2008. In Proceedings of Science, 2008, article 024, p. 1-8 How to Cite?
AbstractBeacom and Yüksel (2006) suggested an elegant method to estimate an initial energy of annihilating positrons from the ratio of 511 keV line and in-flight annihilation fluxes. The idea was that in the case of stationary injection of positrons at high energies the fluxes of 511 keV line emission (generated by thermalized positrons) and of in-flight annihilation (produced by fast positrons) were proportional to each other. For the delta-function injection spectrum they showed that the initial energy of annihilating positrons cannot exceed 3 MeV. Otherwise the expected in-flight annihilation flux of fast positrons in the range 1 to 10 MeV is higher than observed by COMPTEL. However, the conclusion may be changed significantly if one analyzes the spatial distribution of the 511 keV emission and 1-10 MeV emission. In addition if the magnetic field in Galactic center region is 1 mG or higher the injection energy of positrons produced by central compact source can be unrestricted.
DescriptionTopic: An INTEGRAL View of Compact Objects
Persistent Identifierhttp://hdl.handle.net/10722/63098
ISSN

 

DC FieldValueLanguage
dc.contributor.authorChernyshov, DOen_HK
dc.contributor.authorCheng, KSen_HK
dc.contributor.authorDogiel, VAen_HK
dc.date.accessioned2010-07-13T04:15:59Z-
dc.date.available2010-07-13T04:15:59Z-
dc.date.issued2008en_HK
dc.identifier.citationThe 7th Integral Workshop, Copenhagen, Denmark, 8-11 September 2008. In Proceedings of Science, 2008, article 024, p. 1-8en_HK
dc.identifier.issn1824-8039-
dc.identifier.urihttp://hdl.handle.net/10722/63098-
dc.descriptionTopic: An INTEGRAL View of Compact Objectsen_HK
dc.description.abstractBeacom and Yüksel (2006) suggested an elegant method to estimate an initial energy of annihilating positrons from the ratio of 511 keV line and in-flight annihilation fluxes. The idea was that in the case of stationary injection of positrons at high energies the fluxes of 511 keV line emission (generated by thermalized positrons) and of in-flight annihilation (produced by fast positrons) were proportional to each other. For the delta-function injection spectrum they showed that the initial energy of annihilating positrons cannot exceed 3 MeV. Otherwise the expected in-flight annihilation flux of fast positrons in the range 1 to 10 MeV is higher than observed by COMPTEL. However, the conclusion may be changed significantly if one analyzes the spatial distribution of the 511 keV emission and 1-10 MeV emission. In addition if the magnetic field in Galactic center region is 1 mG or higher the injection energy of positrons produced by central compact source can be unrestricted.-
dc.languageengen_HK
dc.publisherScuola Internazionale Superiore di Studi Avanzati (SISSA). The Journal's web site is located at http://pos.sissa.iten_HK
dc.relation.ispartofPoS - Proceedings of Science-
dc.rightsAuthor holds the copyright-
dc.rightsCreative Commons: Attribution 3.0 Hong Kong License-
dc.subjectCompact sources-
dc.subjectGalactic Center-
dc.subjectGalactic Center region-
dc.subjectInitial energy-
dc.subjectInjection energy-
dc.subjectInjection spectra-
dc.subjectLine emissions-
dc.titleRestrictions on the injection energy of positrons annihilating near the Galactic centeren_HK
dc.typeConference_Paperen_HK
dc.identifier.emailCheng, KS: physhead@hku.hken_HK
dc.identifier.authorityCheng, KS=rp00675en_HK
dc.description.naturepublished_or_final_version-
dc.identifier.scopuseid_2-s2.0-84883627033-
dc.identifier.hkuros166353en_HK
dc.identifier.spage1-
dc.identifier.epage8-
dc.publisher.placeItaly-
dc.customcontrol.immutablesml 140617-

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