The reflection spectrum of the low-mass X-ray binary 4U 1636-53
Date Issued
2017
Author(s)
Abstract
We present 3-79 keV NuSTAR observations of the neutron star low-mass X-ray binary 4U 1636-53 in the soft, transitional and hard state. The spectra display a broad emission line at 5-10 keV. We applied several models to fit this line: A Gaussian line, a relativistically broadened emission line model, kyrline, and two models including relativistically smeared and ionized reflection off the accretion disc with different coronal heights, relxill and relxilllp. All models fit the spectra well; however, the kyrline and relxill models yield an inclination of the accretion disc of ∼88° with respect to the line of sight, which is at odds with the fact that this source shows no dips or eclipses. The relxilllp model, on the other hand, gives a reasonable inclination of ∼56°. We discuss our results for these models in this source and the possible primary source of the hard X-rays.
Volume
468
Issue
2
Start page
2256
Issn Identifier
0035-8711
Ads BibCode
2017MNRAS.468.2256W
Rights
open.access
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