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Article: Population study for γ-ray pulsars with the outer gap model

TitlePopulation study for γ-ray pulsars with the outer gap model
Authors
KeywordsMethods: numerical
Pulsars: general
Radiation mechanisms: non-thermal
Stars: neutron
Issue Date2011
PublisherInstitute of Physics Publishing Ltd. The Journal's web site is located at http://iopscience.iop.org/2041-8205
Citation
Astrophysical Journal Letters, 2011, v. 726 n. 1 How to Cite?
AbstractInspired by the increase of the population of γ-ray emitting pulsars by the Fermi telescope, we perform a population study for γ-ray emitting canonical pulsars. We use a Monte Carlo technique to simulate the Galactic population of neutron stars and the radio pulsars. For each simulated neutron star, we consider the γ-ray emission from the outer gap accelerator in the magnetosphere. In our outer gap model, we apply the gap closure mechanism proposed by Takata et al., in which both photon-photon pair-creation and magnetic pair-creation processes are considered. Simulating the sensitivities of previous major radio surveys, our simulation predicts that there are ∼18-23 radioloud and ∼26-34 γ-ray-selected γ-ray pulsars, which can be detected with a γ-ray flux F γ ≥ 10 -10 ergcm -2 s -1. Applying the sensitivity of the six month observation of the Fermi telescope, 40-61 radio-selected and 36-75 γ-ray selected pulsars are detected within our simulation. We show that the distributions of various pulsar parameters for the simulated γ-ray pulsars can be consistent with the observed distribution of the γ-ray pulsars detected by the Fermi telescope. We also predict that ∼64 radio-loud and ∼340 γ-ray-selected pulsars irradiate the Earth with a flux F γ ≥ 10 -11 erg cm -2 s -1, and most of those γ-ray pulsars are distributed with a distance greater than 1 kpc and a flux F γ ∼ 10 -11 ergcm -2 s -1. The ratio between the radio-selected and γ-ray-selected pulsars depends on the sensitivity of the radio surveys. We also discuss the Galactic distribution of the unidentified Fermi sources and the canonical γ-ray pulsars. © 2011. The American Astronomical Society.
Persistent Identifierhttp://hdl.handle.net/10722/133261
ISSN
2015 Impact Factor: 5.487
2015 SCImago Journal Rankings: 3.369
ISI Accession Number ID
Funding AgencyGrant Number
Hong Kong SAR GovernmentHKU700908P
Funding Information:

We thank the useful discussions with H.-K. Chang, K. Hirotani, C. Y. Hui, B. Rudak, M. Ruderman, and S. Shibata. We express our appreciation to the anonymous referee for useful comments, which led to a much improved manuscript. We also thank the Theoretical Institute for Advanced Research in Astrophysics (TIARA) operated under the Academia Sinica Institute of Astronomy and Astrophysics, Taiwan, which enables author J.T. to use the PC cluster at TIARA. This work is supported by a GRF Grant of the Hong Kong SAR Government under HKU700908P.

References

 

DC FieldValueLanguage
dc.contributor.authorTakata, Jen_HK
dc.contributor.authorWang, Yen_HK
dc.contributor.authorCheng, KSen_HK
dc.date.accessioned2011-05-06T05:29:32Z-
dc.date.available2011-05-06T05:29:32Z-
dc.date.issued2011en_HK
dc.identifier.citationAstrophysical Journal Letters, 2011, v. 726 n. 1en_HK
dc.identifier.issn2041-8205en_HK
dc.identifier.urihttp://hdl.handle.net/10722/133261-
dc.description.abstractInspired by the increase of the population of γ-ray emitting pulsars by the Fermi telescope, we perform a population study for γ-ray emitting canonical pulsars. We use a Monte Carlo technique to simulate the Galactic population of neutron stars and the radio pulsars. For each simulated neutron star, we consider the γ-ray emission from the outer gap accelerator in the magnetosphere. In our outer gap model, we apply the gap closure mechanism proposed by Takata et al., in which both photon-photon pair-creation and magnetic pair-creation processes are considered. Simulating the sensitivities of previous major radio surveys, our simulation predicts that there are ∼18-23 radioloud and ∼26-34 γ-ray-selected γ-ray pulsars, which can be detected with a γ-ray flux F γ ≥ 10 -10 ergcm -2 s -1. Applying the sensitivity of the six month observation of the Fermi telescope, 40-61 radio-selected and 36-75 γ-ray selected pulsars are detected within our simulation. We show that the distributions of various pulsar parameters for the simulated γ-ray pulsars can be consistent with the observed distribution of the γ-ray pulsars detected by the Fermi telescope. We also predict that ∼64 radio-loud and ∼340 γ-ray-selected pulsars irradiate the Earth with a flux F γ ≥ 10 -11 erg cm -2 s -1, and most of those γ-ray pulsars are distributed with a distance greater than 1 kpc and a flux F γ ∼ 10 -11 ergcm -2 s -1. The ratio between the radio-selected and γ-ray-selected pulsars depends on the sensitivity of the radio surveys. We also discuss the Galactic distribution of the unidentified Fermi sources and the canonical γ-ray pulsars. © 2011. The American Astronomical Society.en_HK
dc.languageeng-
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.rightsThe Astrophysical Journal. Copyright © Institute of Physics Publishing, Inc.-
dc.subjectMethods: numericalen_HK
dc.subjectPulsars: generalen_HK
dc.subjectRadiation mechanisms: non-thermalen_HK
dc.subjectStars: neutronen_HK
dc.titlePopulation study for γ-ray pulsars with the outer gap modelen_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=0004-637X&volume=726, article no. 44&spage=&epage=&date=2011&atitle=Population+study+for+y-ray+pulsars+with+the+outer+gap+model-
dc.identifier.emailTakata, J: takata@hku.hken_HK
dc.identifier.emailCheng, KS: hrspksc@hkucc.hku.hken_HK
dc.identifier.authorityTakata, J=rp00786en_HK
dc.identifier.authorityCheng, KS=rp00675en_HK
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1088/0004-637X/726/1/44en_HK
dc.identifier.scopuseid_2-s2.0-84891176329en_HK
dc.identifier.hkuros184970-
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-79960211046&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume726en_HK
dc.identifier.issue1en_HK
dc.identifier.eissn1538-4357-
dc.identifier.isiWOS:000285411300044-
dc.publisher.placeUnited Kingdomen_HK
dc.identifier.scopusauthoridTakata, J=22735157300en_HK
dc.identifier.scopusauthoridWang, Y=36085420300en_HK
dc.identifier.scopusauthoridCheng, KS=9745798500en_HK

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