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Article: A pulsar outer gap model with trans-field structure

TitleA pulsar outer gap model with trans-field structure
Authors
KeywordsGamma-rays: theory
Methods: analytical
Pulsars: general
Radiation mechanisms: non-thermal
Issue Date2004
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, 2004, v. 354 n. 4, p. 1120-1132 How to Cite?
AbstractWe investigate the electrodynamics of an outer gap in the meridional plane of the aligned-rotator. The charge depletion from the Goldreich-Julian charge density causes a large electric field along the magnetic field line. The electrons or the positrons are accelerated by the field-aligned electric field and radiate the γ-rays tangentially to the local magnetic field line. Some of these γ-rays collide with X-rays to materialize as electron-positron pairs on different field lines from the field line on which they were emitted. As a result, the electric field structure is expected to change across the field lines. Including these trans-field effects, we solve the formation of the electric field self-consistently with the curvature radiation and the pair creation processes. The γ-ray emission and the pair creation are treated by use of the Monte Carlo technique. We demonstrate that the distribution of the electric field along the field lines is affected by both the gap geometry and the external currents coming into the gap through the boundaries. In the electrodynamic model, it has been known for some time that the solution disappears if the current density carried by the electron-positron pairs produced in the gap exceeds a critical value. We show that the critical current density is significantly increased when the trans-field structure is taken into account. We also find that the location of the inner boundary of the gap shifts toward the stellar surface from the conventional null surface as the current density increases. The reason for the shift is derived from the stability condition of the inner boundary. We also argue that the ideal magnetohydrodynamic condition holds outside the gap only when the low-energy particles coexist with the high-energy particles migrating from the gap.
Persistent Identifierhttp://hdl.handle.net/10722/134627
ISSN
2015 Impact Factor: 4.952
2015 SCImago Journal Rankings: 2.806
ISI Accession Number ID
References

 

DC FieldValueLanguage
dc.contributor.authorTakata, Jen_HK
dc.contributor.authorShibata, Sen_HK
dc.contributor.authorHirotani, Ken_HK
dc.date.accessioned2011-06-29T08:15:32Z-
dc.date.available2011-06-29T08:15:32Z-
dc.date.issued2004en_HK
dc.identifier.citationMonthly Notices Of The Royal Astronomical Society, 2004, v. 354 n. 4, p. 1120-1132en_HK
dc.identifier.issn0035-8711en_HK
dc.identifier.urihttp://hdl.handle.net/10722/134627-
dc.description.abstractWe investigate the electrodynamics of an outer gap in the meridional plane of the aligned-rotator. The charge depletion from the Goldreich-Julian charge density causes a large electric field along the magnetic field line. The electrons or the positrons are accelerated by the field-aligned electric field and radiate the γ-rays tangentially to the local magnetic field line. Some of these γ-rays collide with X-rays to materialize as electron-positron pairs on different field lines from the field line on which they were emitted. As a result, the electric field structure is expected to change across the field lines. Including these trans-field effects, we solve the formation of the electric field self-consistently with the curvature radiation and the pair creation processes. The γ-ray emission and the pair creation are treated by use of the Monte Carlo technique. We demonstrate that the distribution of the electric field along the field lines is affected by both the gap geometry and the external currents coming into the gap through the boundaries. In the electrodynamic model, it has been known for some time that the solution disappears if the current density carried by the electron-positron pairs produced in the gap exceeds a critical value. We show that the critical current density is significantly increased when the trans-field structure is taken into account. We also find that the location of the inner boundary of the gap shifts toward the stellar surface from the conventional null surface as the current density increases. The reason for the shift is derived from the stability condition of the inner boundary. We also argue that the ideal magnetohydrodynamic condition holds outside the gap only when the low-energy particles coexist with the high-energy particles migrating from the gap.en_HK
dc.languageeng-
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.subjectGamma-rays: theoryen_HK
dc.subjectMethods: analyticalen_HK
dc.subjectPulsars: generalen_HK
dc.subjectRadiation mechanisms: non-thermalen_HK
dc.titleA pulsar outer gap model with trans-field structureen_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=0035-8711&volume=354&issue=4&spage=1120&epage=1132&date=2004&atitle=A+pulsar+outer+gap+model+with+trans-field+structure-
dc.identifier.emailTakata, J: takata@hku.hken_HK
dc.identifier.authorityTakata, J=rp00786en_HK
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1111/j.1365-2966.2004.08270.xen_HK
dc.identifier.scopuseid_2-s2.0-8744286781en_HK
dc.identifier.hkuros170786-
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-8744286781&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume354en_HK
dc.identifier.issue4en_HK
dc.identifier.spage1120en_HK
dc.identifier.epage1132en_HK
dc.identifier.isiWOS:000224922600018-
dc.publisher.placeUnited Kingdomen_HK
dc.identifier.scopusauthoridTakata, J=22735157300en_HK
dc.identifier.scopusauthoridShibata, S=7402120464en_HK
dc.identifier.scopusauthoridHirotani, K=7003960035en_HK

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