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Article: Young pulsars and unidentified gamma-ray sources at the Galactic plane

TitleYoung pulsars and unidentified gamma-ray sources at the Galactic plane
Authors
KeywordsGamma rays: observations
Stars: neutron
Stars: pulsars: general
Issue Date2000
PublisherE D P Sciences. The Journal's web site is located at http://www.aanda.org
Citation
Astronomy And Astrophysics, 2000, v. 357 n. 3, p. 957-967 How to Cite?
AbstractWe present a statistical study on possible association between the unidentified γ-ray point sources at the Galactic plane (|b| ≤ 5°) and the Galactic young pulsars with ages of less than 106 yr. Based on the possible positional coincidence of the unidentified EGRET sources in the third catalog with the Galactic objects given by Romero et al. (1999) as well as the outer gap model of γ-ray pulsars proposed by Zhang & Cheng (1997), we have made a statistical analysis on whether most unidentified EGRET point sources in the Galactic plane have pulsar origin. In our analysis, we use an evolving γ-ray solid angle which is the function of pulsar's parameters such as period, magnetic field and magnetic inclination angle. The simulated distributions of the distance and γ-ray energy flux are compared to observed data using Kolmogorov-Smirnov (KS) test. Our results suggest that young pulsars may account for the majority of unidentified EGRET sources that are positionally associated with supernova remnants and OB star associations, in such a way that two thirds are young radio quiet pulsars and one third are young radio pulsars. We have studied the variability of these unidentified γ-ray sources and found that most of them may be non-variable. Furthermore, we expect that GLAST may detect ∼ 80Ṅ100 radio pulsars and ∼ 1100Ṅ100 unidentified γ-ray point sources in the Galactic plane with |b| ≤ 5°, where Ṅ100 is the birth rate of neutron stars in units of 100 years. This model predicts that γ-ray point sources located at small distances are more than those predicted by a γ-ray pulsar model with a constant beaming solid angle.
Persistent Identifierhttp://hdl.handle.net/10722/81044
ISSN
2014 Impact Factor: 4.378
2015 SCImago Journal Rankings: 2.446
References

 

DC FieldValueLanguage
dc.contributor.authorZhang, Len_HK
dc.contributor.authorZhang, YJen_HK
dc.contributor.authorCheng, KSen_HK
dc.date.accessioned2010-09-06T08:13:07Z-
dc.date.available2010-09-06T08:13:07Z-
dc.date.issued2000en_HK
dc.identifier.citationAstronomy And Astrophysics, 2000, v. 357 n. 3, p. 957-967en_HK
dc.identifier.issn0004-6361en_HK
dc.identifier.urihttp://hdl.handle.net/10722/81044-
dc.description.abstractWe present a statistical study on possible association between the unidentified γ-ray point sources at the Galactic plane (|b| ≤ 5°) and the Galactic young pulsars with ages of less than 106 yr. Based on the possible positional coincidence of the unidentified EGRET sources in the third catalog with the Galactic objects given by Romero et al. (1999) as well as the outer gap model of γ-ray pulsars proposed by Zhang & Cheng (1997), we have made a statistical analysis on whether most unidentified EGRET point sources in the Galactic plane have pulsar origin. In our analysis, we use an evolving γ-ray solid angle which is the function of pulsar's parameters such as period, magnetic field and magnetic inclination angle. The simulated distributions of the distance and γ-ray energy flux are compared to observed data using Kolmogorov-Smirnov (KS) test. Our results suggest that young pulsars may account for the majority of unidentified EGRET sources that are positionally associated with supernova remnants and OB star associations, in such a way that two thirds are young radio quiet pulsars and one third are young radio pulsars. We have studied the variability of these unidentified γ-ray sources and found that most of them may be non-variable. Furthermore, we expect that GLAST may detect ∼ 80Ṅ100 radio pulsars and ∼ 1100Ṅ100 unidentified γ-ray point sources in the Galactic plane with |b| ≤ 5°, where Ṅ100 is the birth rate of neutron stars in units of 100 years. This model predicts that γ-ray point sources located at small distances are more than those predicted by a γ-ray pulsar model with a constant beaming solid angle.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.subjectGamma rays: observationsen_HK
dc.subjectStars: neutronen_HK
dc.subjectStars: pulsars: generalen_HK
dc.titleYoung pulsars and unidentified gamma-ray sources at the Galactic planeen_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=0004-6361&volume=357&spage=957&epage=967&date=2000&atitle=Young+Pulsars+and+Unidentified+Gamma-Ray+Sources+at+the+Galactic+Planeen_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-s2.0-0000036218en_HK
dc.identifier.hkuros63937en_HK
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-0000036218&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume357en_HK
dc.identifier.issue3en_HK
dc.identifier.spage957en_HK
dc.identifier.epage967en_HK
dc.publisher.placeFranceen_HK
dc.identifier.scopusauthoridZhang, L=9432987500en_HK
dc.identifier.scopusauthoridZhang, YJ=8960956100en_HK
dc.identifier.scopusauthoridCheng, KS=9745798500en_HK

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