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Optical and Near-Infrared Spectroscopy of the Black Hole Swift J1753.5-0127

Abstract : We report on a multiwavelength observational campaign of the black hole X-ray binary Swift J1753.5-0127 that consists of an ESO/X-shooter spectrum supported by contemporaneous Swift/XRT+UVOT and ATCA data. ISM absorption lines in the X-shooter spectrum allows us to determine E(B-V)=0.45+/-0.02 along the line-of-sight to the source. We also report detection of emission signatures of He II at 4686 angstrom, H alpha, and, for the first time, H I at 10906 angstrom and Paschen Beta. The double-peaked morphology of these four lines is typical of the chromosphere of a rotating accretion disk. Nonetheless, the paucity of disk features points towards a low level of irradiation in the system. This is confirmed through spectral energy distribution modeling and we find that the UVOT+X-shooter continuum mostly stems from the thermal emission of a viscous disk. We speculate that the absence of reprocessing is due to the compactness of an illumination-induced envelope that fails to reflect enough incoming hard X-ray photons back to the outer regions. The disk also marginally contributes to the Compton-dominated X-ray emission and is strongly truncated, with an inner radius about a thousand times larger than the black hole's gravitational radius. A near-infrared excess is present, and we associate it with synchrotron radiation from a compact jet. However, the measured X-ray flux is significantly higher than what can be explained by the optically thin synchrotron jet component. We discuss these findings in the framework of the radio quiet versus X-ray bright hypothesis, favoring the presence of a residual disk, predicted by evaporation models, that contributes to the X-ray emission without enhancing the radio flux.
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Contributor : Nathalie Rouchon <>
Submitted on : Thursday, May 18, 2017 - 11:00:31 AM
Last modification on : Monday, December 14, 2020 - 3:40:33 PM


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Farid Rahoui, John A. Tomsick, Mickael Coriat, Stéphane Corbel, Felix Fürst, et al.. Optical and Near-Infrared Spectroscopy of the Black Hole Swift J1753.5-0127. The Astrophysical journal letters, Bristol : IOP Publishing, 2015, 810 (2), pp.161. ⟨10.1088/0004-637X/810/2/161⟩. ⟨insu-01343963⟩



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