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A broad-band self-consistent modelling of the X-ray spectrum of 4U 1626-67.
- Source :
-
Monthly Notices of the Royal Astronomical Society . 2017, Vol. 470 Issue 2, p2457-2468. 12p. - Publication Year :
- 2017
-
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 kTbb ~ 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. [ABSTRACT FROM AUTHOR]
- Subjects :
- *PULSARS
*STAR observations
*X-ray astronomy
*CYCLOTRON resonance
*CYCLOTRONS
Subjects
Details
- Language :
- English
- ISSN :
- 00358711
- Volume :
- 470
- Issue :
- 2
- Database :
- Academic Search Index
- Journal :
- Monthly Notices of the Royal Astronomical Society
- Publication Type :
- Academic Journal
- Accession number :
- 124218167
- Full Text :
- https://doi.org/10.1093/mnras/stx1146