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Article: Steady, periodic gamma-ray emission from accreting X-ray pulsars

TitleSteady, periodic gamma-ray emission from accreting X-ray pulsars
Authors
KeywordsGamma Rays : Bursts
Pulsars: General
Radiation Mechanisms: Cyclotron And Synchrotron
X-Rays: Stars
Issue Date1992
PublisherInstitute of Physics Publishing Ltd. The Journal's web site is located at http://iopscience.iop.org/2041-8205
Citation
Astrophysical Journal Letters, 1992, v. 390 n. 2, p. 480-485 How to Cite?
AbstractWe study the production mechanisms of medium-energy γ-rays from accreting X-ray pulsars. The models concern electrons accelerated in strongly shielded accelerators above the inner part of the accretion disk whose energies are limited by curvature radiation reaction. The curvature photons are sufficiently energetic to produce secondary e ± pairs in collisions with the hard X-rays from the accretion shock front above the neutron star surface outside the acceleration regions, which are shielded from X-rays. A part of the synchrotron photons radiated by these secondary pairs is still energetic enough to produce a third generation of pairs which also emit synchrotron photons. These processes will continue until the energies of the synchrotron photons are low enough to avoid the pair production process in collision with the stellar X-rays. Summing over all generations of the surviving synchrotron photon spectra gives the model predicted γ-ray spectrum which can be expressed as 55 β -9/2 B -4/7 12(M/M ⊙) -1/7 R -3/7 6 L 9/7 37(D/10 kpc) -2/ln(E max/E min)(E γ/eV) -2 photon s -1 cm -2 eV -1. We suggest that those accreting X-ray pulsars with reported detection of transient very high energy γ-rays (e.g., Her X-1, Cen X-3, and Cyg X-3) should be detectable sources for the Gamma Ray Observatory in the energy range of 10 5-10 7 eV.
Persistent Identifierhttp://hdl.handle.net/10722/174903
ISSN
2015 Impact Factor: 5.487
2015 SCImago Journal Rankings: 3.369

 

DC FieldValueLanguage
dc.contributor.authorCheng, KSen_US
dc.contributor.authorLau, MMen_US
dc.contributor.authorCheung, Ten_US
dc.contributor.authorLeung, PPen_US
dc.contributor.authorDing, KYen_US
dc.date.accessioned2012-11-26T08:48:03Z-
dc.date.available2012-11-26T08:48:03Z-
dc.date.issued1992en_US
dc.identifier.citationAstrophysical Journal Letters, 1992, v. 390 n. 2, p. 480-485en_US
dc.identifier.issn2041-8205en_US
dc.identifier.urihttp://hdl.handle.net/10722/174903-
dc.description.abstractWe study the production mechanisms of medium-energy γ-rays from accreting X-ray pulsars. The models concern electrons accelerated in strongly shielded accelerators above the inner part of the accretion disk whose energies are limited by curvature radiation reaction. The curvature photons are sufficiently energetic to produce secondary e ± pairs in collisions with the hard X-rays from the accretion shock front above the neutron star surface outside the acceleration regions, which are shielded from X-rays. A part of the synchrotron photons radiated by these secondary pairs is still energetic enough to produce a third generation of pairs which also emit synchrotron photons. These processes will continue until the energies of the synchrotron photons are low enough to avoid the pair production process in collision with the stellar X-rays. Summing over all generations of the surviving synchrotron photon spectra gives the model predicted γ-ray spectrum which can be expressed as 55 β -9/2 B -4/7 12(M/M ⊙) -1/7 R -3/7 6 L 9/7 37(D/10 kpc) -2/ln(E max/E min)(E γ/eV) -2 photon s -1 cm -2 eV -1. We suggest that those accreting X-ray pulsars with reported detection of transient very high energy γ-rays (e.g., Her X-1, Cen X-3, and Cyg X-3) should be detectable sources for the Gamma Ray Observatory in the energy range of 10 5-10 7 eV.en_US
dc.languageengen_US
dc.publisherInstitute of Physics Publishing Ltd. The Journal's web site is located at http://iopscience.iop.org/2041-8205en_US
dc.relation.ispartofAstrophysical Journal Lettersen_US
dc.subjectGamma Rays : Burstsen_US
dc.subjectPulsars: Generalen_US
dc.subjectRadiation Mechanisms: Cyclotron And Synchrotronen_US
dc.subjectX-Rays: Starsen_US
dc.titleSteady, periodic gamma-ray emission from accreting X-ray pulsarsen_US
dc.typeArticleen_US
dc.identifier.emailCheng, KS: hrspksc@hkucc.hku.hken_US
dc.identifier.authorityCheng, KS=rp00675en_US
dc.description.naturelink_to_subscribed_fulltexten_US
dc.identifier.scopuseid_2-s2.0-11944255848en_US
dc.identifier.volume390en_US
dc.identifier.issue2en_US
dc.identifier.spage480en_US
dc.identifier.epage485en_US
dc.publisher.placeUnited Kingdomen_US
dc.identifier.scopusauthoridCheng, KS=9745798500en_US
dc.identifier.scopusauthoridLau, MM=16441454100en_US
dc.identifier.scopusauthoridCheung, T=7103334177en_US
dc.identifier.scopusauthoridLeung, PP=7401749062en_US
dc.identifier.scopusauthoridDing, KY=43960894500en_US

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