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Article: A revisit of the phase-resolved X-ray and gamma-ray spectra of the crab pulsar

TitleA revisit of the phase-resolved X-ray and gamma-ray spectra of the crab pulsar
Authors
KeywordsGamma rays: theory
Pulsars: individual (Crab)
Radiation mechanisms: nonthermal
Stars: neutron
X-rays: individual (Crab)
Issue Date2008
PublisherInstitute of Physics Publishing, Inc. The Journal's web site is located at http://iopscience.iop.org/0004-637X/
Citation
Astrophysical Journal, 2008, v. 676 n. 1, p. 562-572 How to Cite?
AbstractWe use a modified outer-gap model to study the multifrequency phase-resolved spectra of the Crab pulsar. The emissions from both poles contribute to the light curve and the phase-resolved spectra. Using the synchrotron self-Compton mechanism and by considering the incomplete conversion of curvature photons into secondary pairs, the observed phase-averaged spectrum from 100 eV to 10 GeV can be explained very well. The predicted phase-resolved spectra can match the observed data reasonably well, too. We find that the emission from the north pole mainly contributes to leading wing 1. The emissions in the remaining phases are mainly dominated by the south pole. The widening of the azimuthal extension of the outer gap explains trailing wing 2. The complicated phase-resolved spectra for the phases between the two peaks, namely, trailing wing 1, the bridge, and leading wing 2, strongly suggest that there are at least two well-separated emission regions with multiple emission mechanisms-synchrotron radiation, inverse Compton scattering, and curvature radiation. Our best-fit results indicate that there may exist some asymmetry between the south and north poles. Our model predictions can be examined with GLAST. © 2008. The American Astronomical Society. All rights reserved.
Persistent Identifierhttp://hdl.handle.net/10722/80426
ISSN
2015 Impact Factor: 5.909
2015 SCImago Journal Rankings: 3.266
ISI Accession Number ID
References

 

DC FieldValueLanguage
dc.contributor.authorTang, APSen_HK
dc.contributor.authorTakata, Jen_HK
dc.contributor.authorJia, JJen_HK
dc.contributor.authorCheng, KSen_HK
dc.date.accessioned2010-09-06T08:06:19Z-
dc.date.available2010-09-06T08:06:19Z-
dc.date.issued2008en_HK
dc.identifier.citationAstrophysical Journal, 2008, v. 676 n. 1, p. 562-572en_HK
dc.identifier.issn0004-637Xen_HK
dc.identifier.urihttp://hdl.handle.net/10722/80426-
dc.description.abstractWe use a modified outer-gap model to study the multifrequency phase-resolved spectra of the Crab pulsar. The emissions from both poles contribute to the light curve and the phase-resolved spectra. Using the synchrotron self-Compton mechanism and by considering the incomplete conversion of curvature photons into secondary pairs, the observed phase-averaged spectrum from 100 eV to 10 GeV can be explained very well. The predicted phase-resolved spectra can match the observed data reasonably well, too. We find that the emission from the north pole mainly contributes to leading wing 1. The emissions in the remaining phases are mainly dominated by the south pole. The widening of the azimuthal extension of the outer gap explains trailing wing 2. The complicated phase-resolved spectra for the phases between the two peaks, namely, trailing wing 1, the bridge, and leading wing 2, strongly suggest that there are at least two well-separated emission regions with multiple emission mechanisms-synchrotron radiation, inverse Compton scattering, and curvature radiation. Our best-fit results indicate that there may exist some asymmetry between the south and north poles. Our model predictions can be examined with GLAST. © 2008. The American Astronomical Society. All rights reserved.en_HK
dc.languageengen_HK
dc.publisherInstitute of Physics Publishing, Inc. The Journal's web site is located at http://iopscience.iop.org/0004-637X/en_HK
dc.relation.ispartofAstrophysical Journalen_HK
dc.rightsCreative Commons: Attribution 3.0 Hong Kong License-
dc.rightsThe Astrophysical Journal. Copyright © Institute of Physics Publishing, Inc.-
dc.subjectGamma rays: theoryen_HK
dc.subjectPulsars: individual (Crab)en_HK
dc.subjectRadiation mechanisms: nonthermalen_HK
dc.subjectStars: neutronen_HK
dc.subjectX-rays: individual (Crab)en_HK
dc.titleA revisit of the phase-resolved X-ray and gamma-ray spectra of the crab pulsaren_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=0004-637X&volume=676&issue=1&spage=562&epage=572&date=2008&atitle=A+revisit+of+the+phase-resolved+X-ray+and+gamma-ray+spectra+of+the+crab+pulsaren_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.naturepostprint-
dc.identifier.doi10.1086/527029en_HK
dc.identifier.scopuseid_2-s2.0-42149122915en_HK
dc.identifier.hkuros170777en_HK
dc.identifier.hkuros141996-
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-42149122915&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume676en_HK
dc.identifier.issue1en_HK
dc.identifier.spage562en_HK
dc.identifier.epage572en_HK
dc.identifier.isiWOS:000254086100042-
dc.publisher.placeUnited Kingdomen_HK
dc.identifier.scopusauthoridTang, APS=22735237200en_HK
dc.identifier.scopusauthoridTakata, J=22735157300en_HK
dc.identifier.scopusauthoridJia, JJ=36865537900en_HK
dc.identifier.scopusauthoridCheng, KS=9745798500en_HK

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