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The reflection spectrum of the low-mass X-ray binary 4U 1636−53

The reflection spectrum of the low-mass X-ray binary 4U 1636−53
The reflection spectrum of the low-mass X-ray binary 4U 1636−53
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.
0035-8711
2256-2264
Wang, Yanan
22c82daf-2af6-4e65-91e8-422601b77ccd
Méndez, Mariano
5cc6f759-dae2-488a-9cc2-cff89f4eca72
Sanna, Andrea
2c05dccc-d674-4ca7-b324-730eb73d6a36
Altamirano, Diego
d5ccdb09-0b71-4303-9538-05b467be075b
Belloni, T.M.
7cbbc962-d7e9-4823-ac14-7c662aa9eb16
Wang, Yanan
22c82daf-2af6-4e65-91e8-422601b77ccd
Méndez, Mariano
5cc6f759-dae2-488a-9cc2-cff89f4eca72
Sanna, Andrea
2c05dccc-d674-4ca7-b324-730eb73d6a36
Altamirano, Diego
d5ccdb09-0b71-4303-9538-05b467be075b
Belloni, T.M.
7cbbc962-d7e9-4823-ac14-7c662aa9eb16

Wang, Yanan, Méndez, Mariano, Sanna, Andrea, Altamirano, Diego and Belloni, T.M. (2017) The reflection spectrum of the low-mass X-ray binary 4U 1636−53. Monthly Notices of the Royal Astronomical Society, 468 (2), 2256-2264. (doi:10.1093/mnras/stx671).

Record type: Article

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.

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The reflection spectrum of the low-mass X-ray binary 4U 1636−53 - Accepted Manuscript
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Accepted/In Press date: 15 March 2017
e-pub ahead of print date: 17 March 2017
Published date: June 2017
Organisations: Astronomy Group

Identifiers

Local EPrints ID: 411625
URI: http://eprints.soton.ac.uk/id/eprint/411625
ISSN: 0035-8711
PURE UUID: 9356fb12-33ae-4464-b120-c3abdc8e49fe
ORCID for Diego Altamirano: ORCID iD orcid.org/0000-0002-3422-0074

Catalogue record

Date deposited: 21 Jun 2017 16:31
Last modified: 22 Nov 2021 03:06

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Contributors

Author: Yanan Wang
Author: Mariano Méndez
Author: Andrea Sanna
Author: T.M. Belloni

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