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dc.contributor.author | Burke M. | |
dc.contributor.author | Gilfanov M. | |
dc.contributor.author | Sunyaev R. | |
dc.date.accessioned | 2018-09-19T21:58:06Z | |
dc.date.available | 2018-09-19T21:58:06Z | |
dc.date.issued | 2017 | |
dc.identifier.issn | 0035-8711 | |
dc.identifier.uri | https://dspace.kpfu.ru/xmlui/handle/net/144542 | |
dc.description.abstract | © 2016 The Authors.We analyse the spectra of black hole (BH) and neutron star (NS) X-ray binaries (XBs) in the hard state using archival RXTE observations. We find that there is a clear dichotomy in the strength of Comptonization between NS and BH sources, as measured by both the Compton y-parameter and the amplification factor A, with distinct groups of BH and NS XBs separated at y ~ 0.9 and A ~ 3. The electron temperature kTe can occupy a broad range in BH systems, from kTe ~ 30 to 200 keV, whereas for NSs kTe is peaked at ~15-25 keV, but can extend to higher values. The difference between BHs and NSs in y implies that kTe is higher at a given optical depth for BH XBs. Our results also imply that for NS systems the accreting material loses ~1/2-2/3 of its energy through Comptonization in the corona. The remaining energy is released on the surface of the NS, making it a powerful source of soft radiation, which alters the properties of the Comptonizing corona. Finally, we find evidence at the~2.4σ confidence level that Comptonization parameters may be correlated with the NS spin, whereas no correlation with the BH spin is found. Our results highlight a further observational distinction between BH and NS XBs, which is a consequence of NSs possessing a physical surface. | |
dc.relation.ispartofseries | Monthly Notices of the Royal Astronomical Society | |
dc.subject | Accretion | |
dc.subject | Accretion discs | |
dc.subject | Radiation mechanisms: general | |
dc.subject | Stars: neutron | |
dc.subject | X-rays: binaries | |
dc.title | A dichotomy between the hard state spectral properties of black hole and neutron star X-ray binaries | |
dc.type | Article | |
dc.relation.ispartofseries-issue | 1 | |
dc.relation.ispartofseries-volume | 466 | |
dc.collection | Публикации сотрудников КФУ | |
dc.relation.startpage | 194 | |
dc.source.id | SCOPUS00358711-2017-466-1-SID85018270212 |