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Article: The statistics of gamma-ray pulsars

TitleThe statistics of gamma-ray pulsars
Authors
KeywordsGamma rays: theory
Pulsars: general
Stars: neutron
Stars: statistics
Issue Date1998
PublisherInstitute of Physics Publishing Ltd. The Journal's web site is located at http://iopscience.iop.org/2041-8205
Citation
Astrophysical Journal Letters, 1998, v. 498 n. 1 PART I, p. 327-341 How to Cite?
AbstractWe use Monte Carlo methods to simulate the properties of a Galactic population of rotation-powered pulsars in the self-consistent outer gap model proposed by Zhang & Cheng, where the initial magnetic field and spatial and velocity distributions of the neutron stars at birth are obtained from the statistical results of radio pulsars. We obtain the distance, period, age, magnetic field, and γ-ray flux distributions of the γ-ray pulsars whose γ-ray and radio fluxes are above the detectable threshold fluxes. Furthermore, we simulate the properties of Geminga-like pulsars and obtain the possible parametric region and the number of the Geminga-like pulsars. In our simulations, the different beaming effects of radio and γ-ray beams are taken into account. We predict that there may be ∼11 γ-ray pulsars that are detectable at both radio and γ-ray energies and ∼ 37 Geminga-like pulsars in the Galactic plane (| b | < 5°) if the γ-ray beaming fraction is 0.67 and the birthrate of the neutron stars is 1 per century. Compared to the flux distribution, individual spectrum, and distance distribution obtained by assuming OB star associations of our simulated Geminga-like pulsars and the unidentified EGRET sources at | b | < 5°, we conclude that the majority of the unidentified γ-ray point sources near the Galactic plane may be Geminga-like pulsars. We also suggest that the most possible radio pulsars likely to be confirmed as γ-ray pulsars in future are those with LX/Ėsd ∼ 10-3. © 1998. The American Astronomical Society. All rights reserved.
Persistent Identifierhttp://hdl.handle.net/10722/43221
ISSN
2015 Impact Factor: 5.487
2015 SCImago Journal Rankings: 3.369
ISI Accession Number ID
References

 

DC FieldValueLanguage
dc.contributor.authorCheng, KSen_HK
dc.contributor.authorZhang, Len_HK
dc.date.accessioned2007-03-23T04:41:35Z-
dc.date.available2007-03-23T04:41:35Z-
dc.date.issued1998en_HK
dc.identifier.citationAstrophysical Journal Letters, 1998, v. 498 n. 1 PART I, p. 327-341en_HK
dc.identifier.issn2041-8205en_HK
dc.identifier.urihttp://hdl.handle.net/10722/43221-
dc.description.abstractWe use Monte Carlo methods to simulate the properties of a Galactic population of rotation-powered pulsars in the self-consistent outer gap model proposed by Zhang & Cheng, where the initial magnetic field and spatial and velocity distributions of the neutron stars at birth are obtained from the statistical results of radio pulsars. We obtain the distance, period, age, magnetic field, and γ-ray flux distributions of the γ-ray pulsars whose γ-ray and radio fluxes are above the detectable threshold fluxes. Furthermore, we simulate the properties of Geminga-like pulsars and obtain the possible parametric region and the number of the Geminga-like pulsars. In our simulations, the different beaming effects of radio and γ-ray beams are taken into account. We predict that there may be ∼11 γ-ray pulsars that are detectable at both radio and γ-ray energies and ∼ 37 Geminga-like pulsars in the Galactic plane (| b | < 5°) if the γ-ray beaming fraction is 0.67 and the birthrate of the neutron stars is 1 per century. Compared to the flux distribution, individual spectrum, and distance distribution obtained by assuming OB star associations of our simulated Geminga-like pulsars and the unidentified EGRET sources at | b | < 5°, we conclude that the majority of the unidentified γ-ray point sources near the Galactic plane may be Geminga-like pulsars. We also suggest that the most possible radio pulsars likely to be confirmed as γ-ray pulsars in future are those with LX/Ėsd ∼ 10-3. © 1998. The American Astronomical Society. All rights reserved.en_HK
dc.format.extent509535 bytes-
dc.format.extent12158 bytes-
dc.format.mimetypeapplication/pdf-
dc.format.mimetypetext/plain-
dc.languageengen_HK
dc.publisherInstitute of Physics Publishing Ltd. The Journal's web site is located at http://iopscience.iop.org/2041-8205en_HK
dc.relation.ispartofAstrophysical Journal Lettersen_HK
dc.rightsCreative Commons: Attribution 3.0 Hong Kong License-
dc.rightsThe Astrophysical Journal. Copyright © University of Chicago Press.en_HK
dc.subjectGamma rays: theoryen_HK
dc.subjectPulsars: generalen_HK
dc.subjectStars: neutronen_HK
dc.subjectStars: statisticsen_HK
dc.titleThe statistics of gamma-ray pulsarsen_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=0004-637X&volume=498&issue=pt 1&spage=327&epage=341&date=1998&atitle=The+Statistics+of+Gamma-Ray+Pulsarsen_HK
dc.identifier.emailCheng, KS: hrspksc@hkucc.hku.hken_HK
dc.identifier.authorityCheng, KS=rp00675en_HK
dc.description.naturepublished_or_final_versionen_HK
dc.identifier.doi10.1086/305531en_HK
dc.identifier.scopuseid_2-s2.0-24444478052en_HK
dc.identifier.hkuros31246-
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-24444478052&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume498en_HK
dc.identifier.issue1 PART Ien_HK
dc.identifier.spage327en_HK
dc.identifier.epage341en_HK
dc.identifier.isiWOS:000073499100032-
dc.publisher.placeUnited Kingdomen_HK
dc.identifier.scopusauthoridCheng, KS=9745798500en_HK
dc.identifier.scopusauthoridZhang, L=38762428100en_HK

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