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Article: Gamma-ray emission properties from mature pulsars in the Galaxy and in the Gould Belt

TitleGamma-ray emission properties from mature pulsars in the Galaxy and in the Gould Belt
Authors
KeywordsGamma rays: theory
Pulsars: general
Stars: neutron
Stars: statistics
Issue Date2004
PublisherInstitute of Physics Publishing Ltd. The Journal's web site is located at http://iopscience.iop.org/2041-8205
Citation
Astrophysical Journal Letters, 2004, v. 608 n. 1 I, p. 418-426 How to Cite?
AbstractWe study the γ-ray emission properties of pulsars by using a new self-consistent outer gap model. The outer gap can exist in pulsars older than 1 million yr if the effect of magnetic inclination angle, as well as the average properties of the outer gap, are considered. The mature γ-ray pulsars, whose ages are between 0.3 and 3 million yr, are able to move up to high Galactic latitude. Moreover, their γ-ray luminosities are weaker, and their spectra are significantly softer than those of younger γ-ray pulsars in the Galactic plane. We use a Monte Carlo method to simulate the statistical properties of γ-ray pulsars in the Galaxy as well as in the Gould Belt. We find that γ-ray pulsars located at |b| < 5° and |b| > 5° have very different properties. High Galactic latitude γ-ray pulsars are dominated by mature pulsars with longer periods, weaker fluxes, and softer spectra. If the pulsar birth rates in the Galaxy and the Gould Belt are ∼10 -2 and ∼2 × 10 -5 yr -1, respectively, there are 42 and 35 radio-quiet γ-ray pulsars for |b| < 5° and |b| > 5°, respectively. The number of radio-quiet γ-ray pulsars from the Gould Belt are 2 and 13 for |b| < 5° and |b| > 5°, respectively. We suggest that a good fraction of unidentified EGRET γ-ray sources may be these radio-quiet γ-ray pulsars. Furthermore, γ-ray pulsars located at |b| > 5° satisfy L γ α L sd β, whereas L γ α L sd δ for γ-ray pulsars in the Galactic plane, where β ∼ 0.6 and δ ∼ 0.3, respectively.
Persistent Identifierhttp://hdl.handle.net/10722/43447
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.contributor.authorLeung, Pen_HK
dc.contributor.authorJiang, ZJen_HK
dc.date.accessioned2007-03-23T04:45:52Z-
dc.date.available2007-03-23T04:45:52Z-
dc.date.issued2004en_HK
dc.identifier.citationAstrophysical Journal Letters, 2004, v. 608 n. 1 I, p. 418-426en_HK
dc.identifier.issn2041-8205en_HK
dc.identifier.urihttp://hdl.handle.net/10722/43447-
dc.description.abstractWe study the γ-ray emission properties of pulsars by using a new self-consistent outer gap model. The outer gap can exist in pulsars older than 1 million yr if the effect of magnetic inclination angle, as well as the average properties of the outer gap, are considered. The mature γ-ray pulsars, whose ages are between 0.3 and 3 million yr, are able to move up to high Galactic latitude. Moreover, their γ-ray luminosities are weaker, and their spectra are significantly softer than those of younger γ-ray pulsars in the Galactic plane. We use a Monte Carlo method to simulate the statistical properties of γ-ray pulsars in the Galaxy as well as in the Gould Belt. We find that γ-ray pulsars located at |b| < 5° and |b| > 5° have very different properties. High Galactic latitude γ-ray pulsars are dominated by mature pulsars with longer periods, weaker fluxes, and softer spectra. If the pulsar birth rates in the Galaxy and the Gould Belt are ∼10 -2 and ∼2 × 10 -5 yr -1, respectively, there are 42 and 35 radio-quiet γ-ray pulsars for |b| < 5° and |b| > 5°, respectively. The number of radio-quiet γ-ray pulsars from the Gould Belt are 2 and 13 for |b| < 5° and |b| > 5°, respectively. We suggest that a good fraction of unidentified EGRET γ-ray sources may be these radio-quiet γ-ray pulsars. Furthermore, γ-ray pulsars located at |b| > 5° satisfy L γ α L sd β, whereas L γ α L sd δ for γ-ray pulsars in the Galactic plane, where β ∼ 0.6 and δ ∼ 0.3, respectively.en_HK
dc.format.extent560130 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.titleGamma-ray emission properties from mature pulsars in the Galaxy and in the Gould Belten_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=0004-637X&volume=608&issue=1 pt 1&spage=418&epage=426&date=2004&atitle=Gamma-Ray+Emission+Properties+from+Mature+Pulsars+in+the+Galaxy+and+in+the+Gould+Belten_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.doi10.1086/386537en_HK
dc.identifier.scopuseid_2-s2.0-3142710943en_HK
dc.identifier.hkuros97119-
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-3142710943&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume608en_HK
dc.identifier.issue1 Ien_HK
dc.identifier.spage418en_HK
dc.identifier.epage426en_HK
dc.identifier.isiWOS:000221881200036-
dc.publisher.placeUnited Kingdomen_HK
dc.identifier.scopusauthoridCheng, KS=9745798500en_HK
dc.identifier.scopusauthoridZhang, L=38762428100en_HK
dc.identifier.scopusauthoridLeung, P=7401749062en_HK
dc.identifier.scopusauthoridJiang, ZJ=7404280278en_HK

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