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Article: Chandra Phase-resolved Spectroscopy of the High Magnetic Field Pulsar B1509−58

TitleChandra Phase-resolved Spectroscopy of the High Magnetic Field Pulsar B1509−58
Authors
Issue Date2017
PublisherAmerican Astronomical Society, co-published with Institute of Physics Publishing, Inc. The Journal's web site is located at http://iopscience.iop.org/0004-637X/
Citation
The Astrophysical Journal, 2017, v. 838 n. 2, p. 156:1-10 How to Cite?
AbstractWe report on a timing and spectral analysis of the young, high magnetic field rotation-powered pulsar (RPP) B1509−58 using Chandra continuous-clocking mode observation. The pulsar's X-ray light curve can be fit by the two Gaussian components and the pulsed fraction shows moderate energy dependence over the Chandra band. The pulsed X-ray spectrum is well described by a power law with a photon index 1.16(4), which is harder than the values measured with RXTE/PCA and NuSTAR. This result supports the log-parabolic model for the broadband X-ray spectrum. With the unprecedented angular resolution of Chandra, we clearly identified off-pulse X-ray emission from the pulsar, and its spectrum is best fit by a power law plus blackbody model. The latter component has a temperature of ~0.14 keV with a bolometric luminosity comparable to the luminosities of other young and high magnetic field RPPs, and it lies between the temperature of magnetars and typical RPPs. In addition, we found that the nonthermal X-ray emission of PSR B1509−58 is significantly softer in the off-pulse phase than in the pulsed phase, with the photon index varying between 1.0 and 1.8 and anticorrelated with the flux. This is similar to the behavior of three other young pulsars. We interpreted it as different contributions of pair-creation processes at different altitudes from the neutron star surface according to the outer-gap model.
Persistent Identifierhttp://hdl.handle.net/10722/240937
ISSN
2017 Impact Factor: 5.551
2015 SCImago Journal Rankings: 3.266
ISI Accession Number ID

 

DC FieldValueLanguage
dc.contributor.authorHu, CP-
dc.contributor.authorNg, SCY-
dc.contributor.authorTakata, J-
dc.contributor.authorShannon, RM-
dc.contributor.authorJohnston, S-
dc.date.accessioned2017-05-22T09:19:47Z-
dc.date.available2017-05-22T09:19:47Z-
dc.date.issued2017-
dc.identifier.citationThe Astrophysical Journal, 2017, v. 838 n. 2, p. 156:1-10-
dc.identifier.issn0004-637X-
dc.identifier.urihttp://hdl.handle.net/10722/240937-
dc.description.abstractWe report on a timing and spectral analysis of the young, high magnetic field rotation-powered pulsar (RPP) B1509−58 using Chandra continuous-clocking mode observation. The pulsar's X-ray light curve can be fit by the two Gaussian components and the pulsed fraction shows moderate energy dependence over the Chandra band. The pulsed X-ray spectrum is well described by a power law with a photon index 1.16(4), which is harder than the values measured with RXTE/PCA and NuSTAR. This result supports the log-parabolic model for the broadband X-ray spectrum. With the unprecedented angular resolution of Chandra, we clearly identified off-pulse X-ray emission from the pulsar, and its spectrum is best fit by a power law plus blackbody model. The latter component has a temperature of ~0.14 keV with a bolometric luminosity comparable to the luminosities of other young and high magnetic field RPPs, and it lies between the temperature of magnetars and typical RPPs. In addition, we found that the nonthermal X-ray emission of PSR B1509−58 is significantly softer in the off-pulse phase than in the pulsed phase, with the photon index varying between 1.0 and 1.8 and anticorrelated with the flux. This is similar to the behavior of three other young pulsars. We interpreted it as different contributions of pair-creation processes at different altitudes from the neutron star surface according to the outer-gap model.-
dc.languageeng-
dc.publisherAmerican Astronomical Society, co-published with Institute of Physics Publishing, Inc. The Journal's web site is located at http://iopscience.iop.org/0004-637X/-
dc.relation.ispartofThe Astrophysical Journal-
dc.rightsThe Astrophysical Journal. Copyright © American Astronomical Society, co-published with Institute of Physics Publishing, Inc.-
dc.titleChandra Phase-resolved Spectroscopy of the High Magnetic Field Pulsar B1509−58-
dc.typeArticle-
dc.identifier.emailHu, CP: cphu@hku.hk-
dc.identifier.emailNg, SCY: ncy@bohr.physics.hku.hk-
dc.identifier.authorityNg, SCY=rp01706-
dc.description.naturepostprint-
dc.identifier.doi10.3847/1538-4357/aa67e3-
dc.identifier.hkuros272064-
dc.identifier.volume838-
dc.identifier.issue2-
dc.identifier.spage156:1-
dc.identifier.epage156:10-
dc.identifier.isiWOS:000399137400005-
dc.publisher.placeUnited States-

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