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

Wang, Yanan and Méndez, Mariano and Sanna, Andrea and 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). pp. 2256-2264. ISSN 0035-8711. doi:10.1093/mnras/stx671.

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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.

Item Type:Article
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URLURL TypeDescription Paper
Altamirano, Diego0000-0002-3422-0074
Additional Information:© 2017 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. Accepted 2017 March 15. Received 2017 March 13; in original form 2016 December 23. Published: 17 March 2017. We thank the referee for many invaluable comments and suggestions. We also thank, Thomas Dauser, for the kind explanation of their models, RELXILL and RELXILLLP. DA acknowledges support from the Royal Society. TMB acknowledges financial contribution from the agreement ASI-INAF I/037/12/0. This research is based on the data from the NuSTAR mission, a project led by the California Institute of Technology, managed by the Jet Propulsion Laboratory and funded by NASA. This work has made use of data from the High Energy Astrophysics Science Archive Research Center (HEASARC), provided by NASA/Goddard Space Flight Center (GSFC).
Subject Keywords:accretion, accretion discs – X-rays: individual: 4U 1636−53
Issue or Number:2
Record Number:CaltechAUTHORS:20170320-100112676
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Official Citation:Yanan Wang, Mariano Méndez, Andrea Sanna, Diego Altamirano, T. M. Belloni; The reflection spectrum of the low-mass X-ray binary 4U 1636−53, Monthly Notices of the Royal Astronomical Society, Volume 468, Issue 2, 21 June 2017, Pages 2256–2264,
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:75234
Deposited By: Joy Painter
Deposited On:20 Mar 2017 17:17
Last Modified:15 Nov 2021 16:31

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