Hard X-ray quiescent emission in magnetars via resonant Compton upscattering

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dc.citation.articleNumber012021en_US
dc.citation.journalTitleJournal of Physics: Conference Seriesen_US
dc.citation.volumeNumber932en_US
dc.contributor.authorBaring, M.G.en_US
dc.contributor.authorWadiasingh, Z.en_US
dc.contributor.authorGonthier, P.L.en_US
dc.contributor.authorHarding, A.K.en_US
dc.date.accessioned2018-07-02T18:19:43Zen_US
dc.date.available2018-07-02T18:19:43Zen_US
dc.date.issued2017en_US
dc.description.abstractNon-thermal quiescent X-ray emission extending between 10 keV and around 150 keV has been seen in about 10 magnetars by RXTE, INTEGRAL, Suzaku, NuSTAR and Fermi-GBM. For inner magnetospheric models of such hard X-ray signals, inverse Compton scattering is anticipated to be the most efficient process for generating the continuum radiation, because the scattering cross section is resonant at the cyclotron frequency. We present hard X-ray upscattering spectra for uncooled monoenergetic relativistic electrons injected in inner regions of pulsar magnetospheres. These model spectra are integrated over bundles of closed field lines and obtained for different observing perspectives. The spectral turnover energies are critically dependent on the observer viewing angles and electron Lorentz factor. We find that electrons with energies less than around 15 MeV will emit most of their radiation below 250 keV, consistent with the turnovers inferred in magnetar hard X-ray tails. Electrons of higher energy still emit most of the radiation below around 1 MeV, except for quasi-equatorial emission locales for select pulse phases. Our spectral computations use a new state-of-the-art, spin-dependent formalism for the QED Compton scattering cross section in strong magnetic fields.en_US
dc.identifier.citationBaring, M.G., Wadiasingh, Z., Gonthier, P.L., et al.. "Hard X-ray quiescent emission in magnetars via resonant Compton upscattering." <i>Journal of Physics: Conference Series,</i> 932, (2017) IOP Publishing: https://doi.org/10.1088/1742-6596/932/1/012021.en_US
dc.identifier.doihttps://doi.org/10.1088/1742-6596/932/1/012021en_US
dc.identifier.urihttps://hdl.handle.net/1911/102334en_US
dc.language.isoengen_US
dc.publisherIOP Publishingen_US
dc.rightsContent from this work may be used under the terms of theﾠCreative Commons Attribution 3.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI.en_US
dc.rights.urihttps://creativecommons.org/licenses/by/3.0/en_US
dc.titleHard X-ray quiescent emission in magnetars via resonant Compton upscatteringen_US
dc.typeJournal articleen_US
dc.type.dcmiTexten_US
dc.type.publicationpublisher versionen_US
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