File Download

There are no files associated with this item.

  Links for fulltext
     (May Require Subscription)
Supplementary

Article: Cosmic-ray positrons from mature gamma-ray pulsars

TitleCosmic-ray positrons from mature gamma-ray pulsars
Authors
KeywordsAcceleration of particles
ISM: cosmic rays
Stars: pulsars: general
Issue Date2001
PublisherE D P Sciences. The Journal's web site is located at http://www.aanda.org
Citation
Astronomy And Astrophysics, 2001, v. 368 n. 3, p. 1063-1070 How to Cite?
AbstractWe consider a possible contribution of mature γ-rays pulsars (with ages of ≥ 105 yrs) to cosmic ray positrons. Within the framework of the γ-ray pulsar outer gap model, e± pairs in the pulsar magnetosphere are produced by the cascade of e± pairs through synchrotron radiation of the return current from the outer gap. A good fraction of these cascade e± pairs are reflected by the hard X-rays from the polar cap via resonant scattering and escape from the pulsar through the light cylinder. The escaped pairs are accelerated to relativistic energies in the pulsar wind driven by low-frequency electromagnetic waves. Using Monte Carlo simulations, we generate a sample of the mature γ-ray pulsars in our Galaxy and calculate the positron production rate from these pulsars. In a simple "leaky box" model, we calculate the ratio of cosmic-ray positrons to total electrons. Our result indicates that the pulsar contribution to the cosmic ray positrons peaks at about 60 GeV and the observed e+/(e- + e+) ratio can be explained in this model.
Persistent Identifierhttp://hdl.handle.net/10722/80885
ISSN
2014 Impact Factor: 4.378
2015 SCImago Journal Rankings: 2.446

 

DC FieldValueLanguage
dc.contributor.authorZhang, Len_HK
dc.contributor.authorCheng, KSen_HK
dc.date.accessioned2010-09-06T08:11:20Z-
dc.date.available2010-09-06T08:11:20Z-
dc.date.issued2001en_HK
dc.identifier.citationAstronomy And Astrophysics, 2001, v. 368 n. 3, p. 1063-1070en_HK
dc.identifier.issn0004-6361en_HK
dc.identifier.urihttp://hdl.handle.net/10722/80885-
dc.description.abstractWe consider a possible contribution of mature γ-rays pulsars (with ages of ≥ 105 yrs) to cosmic ray positrons. Within the framework of the γ-ray pulsar outer gap model, e± pairs in the pulsar magnetosphere are produced by the cascade of e± pairs through synchrotron radiation of the return current from the outer gap. A good fraction of these cascade e± pairs are reflected by the hard X-rays from the polar cap via resonant scattering and escape from the pulsar through the light cylinder. The escaped pairs are accelerated to relativistic energies in the pulsar wind driven by low-frequency electromagnetic waves. Using Monte Carlo simulations, we generate a sample of the mature γ-ray pulsars in our Galaxy and calculate the positron production rate from these pulsars. In a simple "leaky box" model, we calculate the ratio of cosmic-ray positrons to total electrons. Our result indicates that the pulsar contribution to the cosmic ray positrons peaks at about 60 GeV and the observed e+/(e- + e+) ratio can be explained in this model.en_HK
dc.languageengen_HK
dc.publisherE D P Sciences. The Journal's web site is located at http://www.aanda.orgen_HK
dc.relation.ispartofAstronomy and Astrophysicsen_HK
dc.subjectAcceleration of particlesen_HK
dc.subjectISM: cosmic raysen_HK
dc.subjectStars: pulsars: generalen_HK
dc.titleCosmic-ray positrons from mature gamma-ray pulsarsen_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=0004-6361&volume=368&spage=1063&epage=1070&date=2001&atitle=Cosmic-Ray+Positrons+from+Mature+Gamma-Ray+Pulsarsen_HK
dc.identifier.emailCheng, KS: hrspksc@hkucc.hku.hken_HK
dc.identifier.authorityCheng, KS=rp00675en_HK
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.scopuseid_2-s2.0-0035264369en_HK
dc.identifier.hkuros56716en_HK
dc.identifier.volume368en_HK
dc.identifier.issue3en_HK
dc.identifier.spage1063en_HK
dc.identifier.epage1070en_HK
dc.publisher.placeFranceen_HK
dc.identifier.scopusauthoridZhang, L=9432987500en_HK
dc.identifier.scopusauthoridCheng, KS=9745798500en_HK

Export via OAI-PMH Interface in XML Formats


OR


Export to Other Non-XML Formats