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http://hdl.handle.net/20.500.12386/27132
Titolo: | A broad-band self-consistent modelling of the X-ray spectrum of 4U 1626-67 | Autori: | D'AI', ANTONINO CUSUMANO, GIANCARLO DEL SANTO, MELANIA LA PAROLA, VALENTINA SEGRETO, ALBERTO |
Data pubblicazione: | 2017 | Rivista: | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | Numero: | 470 | Fascicolo: | 2 | Da pagina:: | 2457 | Abstract: | The accretion-powered X-ray pulsar 4U 1626-67 is one of the few highly magnetized pulsars that accretes through Roche lobe overflow from a low-mass companion. The characteristics of its broad-band spectrum are similar to those of X-ray pulsars hosted in a high-mass X-ray binary system, with a broad resonant cyclotron scattering feature (CRSF) at ∼37 keV. In this work, we examine the pulse-resolved and the pulse-averaged broad-band spectrum using data from NuSTAR and Swift. We use the Becker & Wolff model of bulk+thermal Comptonization to infer key physical parameters of the accretion column flow and a broad-band model for the disc-reflected spectrum. In the softer X-ray band, we need to add a soft blackbody component with kT<SUB>bb</SUB> ∼ 0.5 keV, whose characteristics indicate a possible origin from the neutron star surface. Residuals suggest that the shape of the cyclotron line could be more satisfactorily fitted using a narrow core and broader wings and, at higher energies, a second harmonic could be present at ∼61 keV. | URI: | http://hdl.handle.net/20.500.12386/27132 | URL: | https://academic.oup.com/mnras/article-abstract/470/2/2457/3815540?redirectedFrom=fulltext | ISSN: | 0035-8711 | DOI: | 10.1093/mnras/stx1146 | Bibcode ADS: | 2017MNRAS.470.2457D | Fulltext: | open |
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