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The impact of neutron star spin on X-ray spectra

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dc.date.accessioned 2019-01-22T20:34:09Z
dc.date.available 2019-01-22T20:34:09Z
dc.date.issued 2018
dc.identifier.issn 0035-8711
dc.identifier.uri https://dspace.kpfu.ru/xmlui/handle/net/147744
dc.description.abstract © 2016 The Authors. We investigate whether the intrinsic spin of neutron stars (NSs) leaves an observable imprint on the spectral properties of X-ray binaries. To evaluate this, we consider a sample of nine NSs for which the spins have been measured that are not accreting pulsars (for which the accretion geometry will be different). For each source, we perform spectroscopy on a majority of RXTE hard-state observations. Our sample of sources and observations spans the range of the Eddington ratios LX/LEdd~ 0.005-0.100. We find a clear trend between the key Comptonization properties and the NS spin for a given accretion rate. Specifically, at a given L/LEdd, for more rapidly rotating NSs we find lower seed photon temperatures and a general increase in Comptonization strength, as parametrized by the Comptonization y parameter and amplification factor A. This is in good agreement with the theoretical scenario whereby less energy is liberated in a boundary layer for more rapidly spinning NSs, resulting in a lower seed photon luminosity and, consequently, less Compton cooling in the corona. This effect in extremis results in the hard states of the most rapidly spinning sources encroaching upon the regime of Comptonization properties occupied by black holes.
dc.relation.ispartofseries Monthly Notices of the Royal Astronomical Society
dc.subject Accretion
dc.subject Accretion discs
dc.subject Stars: neutron
dc.subject X-rays: binaries
dc.subject X-rays: general
dc.title The impact of neutron star spin on X-ray spectra
dc.type Article
dc.relation.ispartofseries-issue 1
dc.relation.ispartofseries-volume 474
dc.collection Публикации сотрудников КФУ
dc.relation.startpage 760
dc.source.id SCOPUS00358711-2018-474-1-SID85046110580


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  • Публикации сотрудников КФУ Scopus [24551]
    Коллекция содержит публикации сотрудников Казанского федерального (до 2010 года Казанского государственного) университета, проиндексированные в БД Scopus, начиная с 1970г.

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