Broadband spectral analysis of MXB 1659-298 in its soft and hard state

Abstract

The X-ray transient eclipsing source MXB 1659-298 went into outburst in 1999 and 2015. During these two outbursts the source was observed by XMM-Newton, nuSTAR, and Swift/XRT. Using these observations, we studied the broadband spectrum of the source to constrain the continuum components and to verify whether it had a reflection component, as is observed in other X-ray eclipsing transient sources. We combined the available spectra to study the soft and hard state of the source in the 0.45-55 keV energy range. We report a reflection component in the soft and hard state. The direct emission in the soft state can be modeled with a thermal component originating from the inner accretion disk plus a Comptonized component associated with an optically thick corona surrounding the neutron star. On the other hand, the direct emission in the hard state is described only by a Comptonized component with a temperature higher than 130 keV; this component is associated with an optically thin corona. We observed narrow absorption lines from highly ionized ions of oxygen, neon, and iron in the soft spectral state. We investigated where the narrow absorption lines form in the ionized absorber. The equivalent hydrogen column density associated with the absorber is close to $6\times 10^{23}$ cm${}^{-2}$ and $1.3\times 10^{23}$ cm${}^{-2}$ in the soft and hard state, respectively.

arXiv comment12 pages, 8 Figures. Accepted by Astronomy & Astrophysics

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• Evidence of a non-conservative mass transfer in the ultra-compact X-ray source XB 1916-053
• Broad-band spectral analysis of LMXB XTE J1710-281 with Suzaku
• Fe K$\alpha$ and Fe K$\beta$ line detection in the NuSTAR spectrum of the ultra-bright Z-source Scorpius X-1
• Accretion disc winds in X-ray binaries
• Spectral study of neutron star low mass X-ray binary source 1A 1744-361
• A large population of neutron star low-mass X-ray binaries with long outburst recurrence time ?