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Article: Pulsed gamma-ray emission from short-period pulsars

TitlePulsed gamma-ray emission from short-period pulsars
Authors
KeywordsGamma rays: theory
Pulsars: general
Radiation mechanisms: nonthermal
Issue Date1994
PublisherInstitute of Physics Publishing Ltd. The Journal's web site is located at http://iopscience.iop.org/2041-8205
Citation
Astrophysical Journal Letters, 1994, v. 431 n. 2, p. 724-731 How to Cite?
AbstractWe study the gamma-ray emission mechanisms from pulsars with period, P, between 4.6 × 10-2B2/5 12 s and 0.17B5/12 sin1/6 θα-5/4 s in terms of outermagnetospheric gap model, in which electrostatic accelerators have been proposed to exist in regions near the null charge surfaces where Ω· B = 0. We found that the spectra of all known γ-ray pulsars can be fitted by two free parameters, namely, αrL, the mean distance to the outergap, and sin Eθ, the mean pitch angle of the secondary e± pairs. Gamma-rays from those pulsars with P < 0.17B5/12 sin1/6 θα-5/4 are mainly emitted by secondary e± pairs, which are created beyond the outergap, via synchrotron radiation and the gamma-ray emission efficiency is ∼10-2. For pulsars with period approaching ∼0.17B5/12 sin1/6 θα-5/4 s, their gamma-ray emission efficiency is approaching unity. The comparison of model results and the observed data, including gamma-ray spectrum, efficiency, relative intensity, and phase separation of pulses are discussed in the text.
Persistent Identifierhttp://hdl.handle.net/10722/43230
ISSN
2015 Impact Factor: 5.487
2015 SCImago Journal Rankings: 3.369
ISI Accession Number ID

 

DC FieldValueLanguage
dc.contributor.authorCheng, KSen_HK
dc.contributor.authorDing, WKYen_HK
dc.date.accessioned2007-03-23T04:41:46Z-
dc.date.available2007-03-23T04:41:46Z-
dc.date.issued1994en_HK
dc.identifier.citationAstrophysical Journal Letters, 1994, v. 431 n. 2, p. 724-731en_HK
dc.identifier.issn2041-8205en_HK
dc.identifier.urihttp://hdl.handle.net/10722/43230-
dc.description.abstractWe study the gamma-ray emission mechanisms from pulsars with period, P, between 4.6 × 10-2B2/5 12 s and 0.17B5/12 sin1/6 θα-5/4 s in terms of outermagnetospheric gap model, in which electrostatic accelerators have been proposed to exist in regions near the null charge surfaces where Ω· B = 0. We found that the spectra of all known γ-ray pulsars can be fitted by two free parameters, namely, αrL, the mean distance to the outergap, and sin Eθ, the mean pitch angle of the secondary e± pairs. Gamma-rays from those pulsars with P < 0.17B5/12 sin1/6 θα-5/4 are mainly emitted by secondary e± pairs, which are created beyond the outergap, via synchrotron radiation and the gamma-ray emission efficiency is ∼10-2. For pulsars with period approaching ∼0.17B5/12 sin1/6 θα-5/4 s, their gamma-ray emission efficiency is approaching unity. The comparison of model results and the observed data, including gamma-ray spectrum, efficiency, relative intensity, and phase separation of pulses are discussed in the text.en_HK
dc.format.extent1229434 bytes-
dc.format.extent12158 bytes-
dc.format.mimetypeapplication/pdf-
dc.format.mimetypetext/plain-
dc.languageengen_HK
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.rightsCreative Commons: Attribution 3.0 Hong Kong License-
dc.rightsThe Astrophysical Journal. Copyright © University of Chicago Press.en_HK
dc.subjectGamma rays: theoryen_HK
dc.subjectPulsars: generalen_HK
dc.subjectRadiation mechanisms: nonthermalen_HK
dc.titlePulsed gamma-ray emission from short-period pulsarsen_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=0004-637X&volume=431&issue=2 pt 1&spage=724&epage=731&date=1994&atitle=Pulsed+gamma-ray+emission+from+short-period+pulsarsen_HK
dc.identifier.emailCheng, KS: hrspksc@hkucc.hku.hken_HK
dc.identifier.authorityCheng, KS=rp00675en_HK
dc.description.naturepublished_or_final_versionen_HK
dc.identifier.doi10.1086/174523en_HK
dc.identifier.scopuseid_2-s2.0-12044260153en_HK
dc.identifier.hkuros3262-
dc.identifier.volume431en_HK
dc.identifier.issue2en_HK
dc.identifier.spage724en_HK
dc.identifier.epage731en_HK
dc.identifier.isiWOS:A1994PC14800025-
dc.publisher.placeUnited Kingdomen_HK
dc.identifier.scopusauthoridCheng, KS=9745798500en_HK
dc.identifier.scopusauthoridDing, WKY=43961079600en_HK

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