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Title: Spectral properties of MXB 1658–298 in the low/hard and high/soft state
Authors: Sharma, Rahul
Jaleel, Abdul
Jain, Chetana
Pandey, Jeewan C
Paul, Biswajit
Dutta, Anjan
Keywords: accretion
accretion discs
techniques: spectroscopic
stars: neutron
X-rays: binaries
X-rays: individual: MXB 1658–298
Issue Date: 21-Dec-2018
Publisher: Oxford University Press on behalf of the Royal Astronomical Society
Citation: Monthly Notices of the Royal Astronomical Society, 2018, Vol. 481, p5560–5569
Abstract: We report results from a broad-band spectral analysis of the low mass X-ray binary MXB 1658–298 with the Swift/X-Ray Telescope and Nuclear Spectroscopic Telescope Array(NuSTAR) observations made during its 2015–2017 outburst. The source showed different spectral states and accretion rates during this outburst. The source was in low/hard state during 2015; and it was in high/soft state during the 2016 NuSTAR observations. This is the first time that a comparison of the soft and hard spectral states during an outburst is being reported in MXB 1658–298. Compared with the observation of 2015, the X-ray luminosity was about four times higher during 2016. The hard state spectrum can be well described with models consisting of a single-temperature blackbody component along with Comptonized disc emission, or three-component model comprising multicolour disc, single-temperature blackbody, and thermal Comptonization components. The soft state spectrum can be described with blackbody or disc blackbody and Comptonization component, where the neutron star surface (or boundary layer) is the dominant source for the Comptonization seed photons. We have also found a link between the spectral state of the source and the Fe K absorber. The absorption features due to highly ionized Fe were observed only in the soft state. This suggests a probable connection between accretion disc wind (or atmosphere) and spectral state (or accretion state) of MXB 1658–298.
Description: Open Access
ISSN: 0035-8711
1365-2966 - (online)
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Copyright: 2018 The Author(s)
Appears in Collections:Research Papers (A&A)

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