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

TitlePopulation study for γ-ray pulsars with the outer gap model - II. Millisecond pulsars
Authors
KeywordsGamma-rays: stars
Methods: statistical
Pulsars: general
Radiation mechanisms: non-thermal
Stars: neutron
Issue Date2011
PublisherBlackwell Publishing Ltd. The Journal's web site is located at http://www.blackwellpublishing.com/journals/MNR
Citation
Monthly Notices Of The Royal Astronomical Society, 2011, v. 414 n. 3, p. 2173-2185 How to Cite?
AbstractThe population of γ-ray emitting millisecond pulsars (MSPs) was studied by using Monte Carlo techniques. We simulated the Galactic distributions of the MSPs, and applied the outer gap model for the γ-ray emission from each simulated MSP. We took into account the dependence of the observed γ-ray flux on the viewing angle and on the inclination angle, which is the angle between the rotation axis and the magnetic axis, respectively. Using the sensitivity of the 6-month long observation of the Fermi telescope and radio sensitivities of existing pulsar surveys, 9-13 radio-selected and 22-35 γ-ray-selected pulsars are detected within our simulation. The statistical properties of the simulated population are consistent with the Fermi observations. Scaling the observed sensitivity, where T is the length of observation time, the present model predicts that over the 5-year mission Fermi would detect 15-22 radio-selected γ-ray MSPs, and 95-152 γ-ray-selected MSPs. Our simulation also predicts that about 100 (or 200-300) γ-ray MSPs with a flux larger than F≥ 10 -11ergcm -2s -1 (or 5 × 10 -12ergcm -2s -1) irradiate the Earth. With the present sensitivities of radio surveys, most of them are categorized as γ-ray-selected pulsars, indicating that most of the γ-ray MSPs have been missed by the present Fermi observations. We argue that the Galactic Fermi unidentified sources located at high latitudes should be dominated by MSPs, whereas the sources in the Galactic plane are dominated by radio-quiet canonical pulsars. We want to emphasize that the predicted number of radio-loud γ-ray MSPs depends on the sensitivities of radio surveys and that it can be increased, for example, from 15-22 to 26-37 if the radio sensitivity is improved by a factor of 2. © 2011 The Authors Monthly Notices of the Royal Astronomical Society © 2011 RAS.
Persistent Identifierhttp://hdl.handle.net/10722/135361
ISSN
2015 Impact Factor: 4.952
2015 SCImago Journal Rankings: 2.806
ISI Accession Number ID
Funding AgencyGrant Number
GRF of the Hong Kong SAR Government
Funding Information:

We thank A. H. Kong, C. Y. Hui, B. Rudak, M. Ruderman, R. E. Taam and S. Shibata for the useful discussions, and T. Harko and K. MacKeown for a critical reading of our manuscript. We express our appreciation to an anonymous referee for insightful comments. We also thank the Theoretical Institute for Advanced Research in Astrophysics (TIARA) operated under the Academia Sinica Institute of Astronomy and Astrophysics, Taiwan, which enabled JT to use the PC cluster at TIARA. KSC is supported by a 2011 GRF grant of the Hong Kong SAR Government entitled 'Gamma-ray Pulsars'.

References

 

DC FieldValueLanguage
dc.contributor.authorTakata, Jen_HK
dc.contributor.authorWang, Yen_HK
dc.contributor.authorCheng, KSen_HK
dc.date.accessioned2011-07-27T01:34:10Z-
dc.date.available2011-07-27T01:34:10Z-
dc.date.issued2011en_HK
dc.identifier.citationMonthly Notices Of The Royal Astronomical Society, 2011, v. 414 n. 3, p. 2173-2185en_HK
dc.identifier.issn0035-8711en_HK
dc.identifier.urihttp://hdl.handle.net/10722/135361-
dc.description.abstractThe population of γ-ray emitting millisecond pulsars (MSPs) was studied by using Monte Carlo techniques. We simulated the Galactic distributions of the MSPs, and applied the outer gap model for the γ-ray emission from each simulated MSP. We took into account the dependence of the observed γ-ray flux on the viewing angle and on the inclination angle, which is the angle between the rotation axis and the magnetic axis, respectively. Using the sensitivity of the 6-month long observation of the Fermi telescope and radio sensitivities of existing pulsar surveys, 9-13 radio-selected and 22-35 γ-ray-selected pulsars are detected within our simulation. The statistical properties of the simulated population are consistent with the Fermi observations. Scaling the observed sensitivity, where T is the length of observation time, the present model predicts that over the 5-year mission Fermi would detect 15-22 radio-selected γ-ray MSPs, and 95-152 γ-ray-selected MSPs. Our simulation also predicts that about 100 (or 200-300) γ-ray MSPs with a flux larger than F≥ 10 -11ergcm -2s -1 (or 5 × 10 -12ergcm -2s -1) irradiate the Earth. With the present sensitivities of radio surveys, most of them are categorized as γ-ray-selected pulsars, indicating that most of the γ-ray MSPs have been missed by the present Fermi observations. We argue that the Galactic Fermi unidentified sources located at high latitudes should be dominated by MSPs, whereas the sources in the Galactic plane are dominated by radio-quiet canonical pulsars. We want to emphasize that the predicted number of radio-loud γ-ray MSPs depends on the sensitivities of radio surveys and that it can be increased, for example, from 15-22 to 26-37 if the radio sensitivity is improved by a factor of 2. © 2011 The Authors Monthly Notices of the Royal Astronomical Society © 2011 RAS.en_HK
dc.languageengen_US
dc.publisherBlackwell Publishing Ltd. The Journal's web site is located at http://www.blackwellpublishing.com/journals/MNRen_HK
dc.relation.ispartofMonthly Notices of the Royal Astronomical Societyen_HK
dc.rightsThe definitive version is available at www.blackwell-synergy.com-
dc.rights© 2011 The Authors Monthly Notices of the Royal Astronomical Society © 2011 RAS-
dc.rightsCreative Commons: Attribution 3.0 Hong Kong License-
dc.subjectGamma-rays: starsen_HK
dc.subjectMethods: statisticalen_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 model - II. Millisecond pulsarsen_HK
dc.typeArticleen_HK
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.naturepublished_or_final_version-
dc.identifier.doi10.1111/j.1365-2966.2011.18534.xen_HK
dc.identifier.scopuseid_2-s2.0-79959376529en_HK
dc.identifier.hkuros186456en_US
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-79959376529&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume414en_HK
dc.identifier.issue3en_HK
dc.identifier.spage2173en_HK
dc.identifier.epage2185en_HK
dc.identifier.isiWOS:000292977600028-
dc.publisher.placeUnited Kingdomen_HK
dc.identifier.scopusauthoridTakata, J=22735157300en_HK
dc.identifier.scopusauthoridWang, Y=36085420300en_HK
dc.identifier.scopusauthoridCheng, KS=9745798500en_HK
dc.identifier.citeulike9519725-

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