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|Title:||The very faint hard state of the persistent neutron star X-ray binary SLX 1737-282 near the Galactic Centre||Authors:||Armas Padilla, M.
De Marco, B.
|Issue Date:||2018||Journal:||MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY||Number:||473||Issue:||3||First Page:||3789||Abstract:||We report on a detailed study of the spectral and temporal properties of the neutron star low-mass X-ray binary SLX 1737-282, which is located only ∼1° away from Sgr A*. The system is expected to have a short orbital period, even within the ultracompact regime, given its persistent nature at low X-ray luminosities and the long duration thermonuclear burst that it has displayed. We have analysed a Suzaku (18 ks) observation and an XMM-Newton (39 ks) observation taken 7 yr apart. We infer (0.5-10 keV) X-ray luminosities in the range of 3-6 × 10<SUP>35</SUP>ergs<SUP>-1</SUP>, in agreement with previous findings. The spectra are well described by a relatively cool (kT<SUB>bb</SUB> = 0.5 keV) blackbody component plus a Comptonized emission component with Γ ∼ 1.5-1.7. These values are consistent with the source being in a faint hard state, as confirmed by the ∼20 per cent fractional root-mean-square amplitude of the fast variability (0.1-7 Hz) inferred from the XMM-Newton data. The electron temperature of the corona is ≳7 keV for the Suzaku observation, but it is measured to be as low as ∼2 keV in the XMM-Newton data at higher flux. The latter is significantly lower than expected for systems in the hard state. We searched for X-ray pulsations and imposed an upper limit to their semi-amplitude of 2 per cent (0.001-7 Hz). Finally, we investigated the origin of the low-frequency variability emission present in the XMM-Newton data and ruled out an absorption dip origin. This constraint the orbital inclination of the system to ≲65° unless the orbital period is longer than 11 h (i.e. the length of the XMM-Newton observation).||URI:||http://hdl.handle.net/20.500.12386/29395||URL:||https://academic.oup.com/mnras/article/473/3/3789/4265368||ISSN:||0035-8711||DOI:||10.1093/mnras/stx2538||Bibcode ADS:||2018MNRAS.473.3789A||Fulltext:||open|
|Appears in Collections:||1.01 Articoli in rivista|
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