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Article: Pulse profiles, spectra, and polarization characteristics of nonthermal emissions from the crab-like pulsars

TitlePulse profiles, spectra, and polarization characteristics of nonthermal emissions from the crab-like pulsars
Authors
KeywordsGamma rays: theory
Radiation mechanisms: nonthermal
X-rays: general
Issue Date2007
PublisherInstitute of Physics Publishing Ltd. The Journal's web site is located at http://iopscience.iop.org/2041-8205
Citation
Astrophysical Journal Letters, 2007, v. 670 n. 1, p. 679-692 How to Cite?
AbstractWe discuss nonthermal emission mechanisms of the Crab-like pulsars with both a two-dimensional electrodynamic study and a three-dimensional model. We investigate the emission process in the outer gap accelerator. In the two-dimensional electrodynamic study, we solve the Poisson equation of the accelerating electric field in the outer gap and the equation of motion of the primary particles with the synchrotron and the curvature radiation processes and the pair-creation process. We show a solved gap structure that produces a γ-ray spectrum consistent with EGRET observations. Based on the two-dimensional model, we construct a three-dimensional emission model to calculate the synchrotron and the inverse Compton processes of the secondary pairs produced outside the outer gap. We calculate the pulse profiles, the phase-resolved spectra, and the polarization characteristics in optical through 7-ray bands for comparison with the observation of the Crab pulsar and PSR B0540 -69. For the Crab pulsar, we find that the outer gap geometry extending from near the stellar surface to near the light cylinder produces a complex morphology change of the pulse profiles as a function of the photon energy. This predicted morphology change is quite similar to that of the observations. The calculated phase-resolved spectra are consistent with the data from the optical to the 7-ray bands. We demonstrate that the 10%-20% of the polarization degree in the optical emissions from the Crab pulsar and the Vela pulsar is explained by the synchrotron emissions from the particle gyration motion. For PSR B0540-69, the observed pulse profile with a single broad pulse is reproduced for an emission region thicker and an inclination angle between the rotational axis and the magnetic axis smaller than the Crab pulsar. © 2007. The American Astronomical Society. All rights reserved.
Persistent Identifierhttp://hdl.handle.net/10722/129032
ISSN
2015 Impact Factor: 5.487
2015 SCImago Journal Rankings: 3.369
ISI Accession Number ID
References

 

DC FieldValueLanguage
dc.contributor.authorTakata, Jen_HK
dc.contributor.authorChang, HKen_HK
dc.date.accessioned2010-12-21T03:32:56Z-
dc.date.available2010-12-21T03:32:56Z-
dc.date.issued2007en_HK
dc.identifier.citationAstrophysical Journal Letters, 2007, v. 670 n. 1, p. 679-692en_HK
dc.identifier.issn2041-8205en_HK
dc.identifier.urihttp://hdl.handle.net/10722/129032-
dc.description.abstractWe discuss nonthermal emission mechanisms of the Crab-like pulsars with both a two-dimensional electrodynamic study and a three-dimensional model. We investigate the emission process in the outer gap accelerator. In the two-dimensional electrodynamic study, we solve the Poisson equation of the accelerating electric field in the outer gap and the equation of motion of the primary particles with the synchrotron and the curvature radiation processes and the pair-creation process. We show a solved gap structure that produces a γ-ray spectrum consistent with EGRET observations. Based on the two-dimensional model, we construct a three-dimensional emission model to calculate the synchrotron and the inverse Compton processes of the secondary pairs produced outside the outer gap. We calculate the pulse profiles, the phase-resolved spectra, and the polarization characteristics in optical through 7-ray bands for comparison with the observation of the Crab pulsar and PSR B0540 -69. For the Crab pulsar, we find that the outer gap geometry extending from near the stellar surface to near the light cylinder produces a complex morphology change of the pulse profiles as a function of the photon energy. This predicted morphology change is quite similar to that of the observations. The calculated phase-resolved spectra are consistent with the data from the optical to the 7-ray bands. We demonstrate that the 10%-20% of the polarization degree in the optical emissions from the Crab pulsar and the Vela pulsar is explained by the synchrotron emissions from the particle gyration motion. For PSR B0540-69, the observed pulse profile with a single broad pulse is reproduced for an emission region thicker and an inclination angle between the rotational axis and the magnetic axis smaller than the Crab pulsar. © 2007. The American Astronomical Society. All rights reserved.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.subjectGamma rays: theoryen_HK
dc.subjectRadiation mechanisms: nonthermalen_HK
dc.subjectX-rays: generalen_HK
dc.titlePulse profiles, spectra, and polarization characteristics of nonthermal emissions from the crab-like pulsarsen_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=0004-637X&volume=670&issue=1&spage=679&epage=692&date=2007&atitle=Pulse+profiles,+spectra,+and+polarization+characteristics+of+nonthermal+emissions+from+the+crab-like+pulsars-
dc.identifier.emailTakata, J: takata@hku.hken_HK
dc.identifier.authorityTakata, J=rp00786en_HK
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1086/521785-
dc.identifier.scopuseid_2-s2.0-39049170680en_HK
dc.identifier.hkuros170781-
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-39049170680&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume670en_HK
dc.identifier.issue1en_HK
dc.identifier.spage679en_HK
dc.identifier.epage692en_HK
dc.identifier.isiWOS:000250965400052-
dc.publisher.placeUnited Kingdomen_HK
dc.identifier.scopusauthoridTakata, J=22735157300en_HK
dc.identifier.scopusauthoridChang, HK=7407523188en_HK

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