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Disentangling the NIR/optical emission of the black hole XTE J1650-500 during outburst

Abstract : Context. While the sources of X-ray and radio emission in the different states of low-mass X-ray binaries are relatively well understood, the origin of the near-infrared (NIR) and optical emission is more often debated. It is likely that the NIR/optical flux originates from an amalgam of different emission regions, because it occurs at the intersecting wavelengths of multiple processes. Aims: We aim to identify the NIR/optical emission region(s) of one such low-mass X-ray binary and black hole candidate, XTE J1650-500, via photometric, timing, and spectral analyses. Methods: We present unique NIR/optical images and spectra, obtained with the ESO-New Technology Telescope, during the peak of the 2001 outburst of XTE J1650-500. Results: The data suggest that the NIR/optical flux is due to a combination of emission mechanisms including a significant contribution from X-ray reprocessing and, at early times in the hard state, a relativistic jet that is NIR/radio dim compared to similar sources. Conclusions: The jet of XTE J1650-500 is relatively weak compared to that of other black hole low-mass X-ray binaries, possibly because we observe as it is being "turned off" or quenched at the state transition. While there are several outliers to the radio-X-ray correlation of the hard state of low-mass X-ray binaries, XTE J1650-500 is the first example of an outlier to the NIR/optical-X-ray correlation. Based on observations made with the European Southern Observatory telescopes obtained from the ESO/ST-ECF Science Archive Facility.
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Submitted on : Tuesday, November 12, 2013 - 6:33:45 PM
Last modification on : Friday, October 30, 2020 - 12:04:02 PM

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P.A. Curran, S. Chaty, J.A. Zurita Heras. Disentangling the NIR/optical emission of the black hole XTE J1650-500 during outburst. Astronomy and Astrophysics - A&A, EDP Sciences, 2012, 547, pp.A41. ⟨10.1051/0004-6361/201219228⟩. ⟨in2p3-00903710⟩



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