Suzaku spectroscopy of the neutron star transient 4U 1608-52 during its outburst decay

Abstract

We test the proposed 3-component spectral model for neutron star low mass X-ray binaries using broad-band X-ray data. We have analysed 4 X-ray spectra (0.8-30 keV) obtained with Suzaku during the 2010 outburst of 4U 1608-52, which have allowed us to perform a comprehensive spectral study covering all the classical spectral states. We use a thermally Comptonized continuum component to account for the hard emission, as well as two thermal components to constrain the accretion disc and neutron star surface contributions. We find that the proposed combination of multicolor disc, single-temperature black body and Comptonization components successfully reproduces the data from soft to hard states. In the soft state, our study supports the neutron star surface (or boundary layer) as the dominant source for the Comptonization seed photons yielding the observed weak hard emission, while in the hard state both solutions, either the disc or the neutron star surface, are equally favoured. The obtained spectral parameters as well as the spectral/timing correlations are comparable to those observed in accreting black holes, which support the idea that black hole and neutron star low mass X-ray binaries undergo a similar state evolution during their accretion episodes.

8 pages, 4 figures, 2 tables. Accepted for publication in MNRAS

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• Modelling the behaviour of accretion flows in X-ray binaries
• Thermonuclear (type-I) X-ray bursts observed by the Rossi X-ray Timing Explorer
• Black hole-like hysteresis and accretion states in neutron star low mass X-ray binaries
• X-ray time variability across the atoll source states of 4U 1636--53
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• Insight-HXMT observation on 4U~1608--52: evidence of interplay between thermonuclear burst and accretion environments
• Discovery of the new X-ray transient MAXI J1807+132: a Candidate of a Neutron Star Low-mass X-ray binary
• Catalog of outbursts of neutron star LMXBs
• Multi-wavelength spectroscopy of the black hole candidate MAXI J1813-095 during its discovery outburst
• Broad-band spectral analysis of LMXB XTE J1710-281 with Suzaku
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• Probing the accretion geometry of the atoll source 4U 1702-429 in different spectral states with NICER, NuSTAR, and AstroSat
• Evolution of the Accretion Disk and Corona During the Outburst of the Neutron Star Transient MAXI J1807+132
• Accretion disc winds in X-ray binaries
• Tracing the outburst decay of soft X-ray transients Aql X-1 and 4U 1608-52 with XSPECT