Evidence for quiescent synchrotron emission in the black hole X-ray transient Swift J1357.2-0933

T. Shahbaz, D. M. Russell, C. Zurita, J. Casares, J. M. Corral-Santana, V. S. Dhillon, T. R. Marsh

Research output: Contribution to journalConference articlepeer-review


We present high time-resolution optical and infrared observations of the edge-on black hole X-ray transient Swift J1357.2-0933. Our data taken in 2012 shows the system to be at its pre-outburst magnitude and so the system is in quiescence. In contrast to other X-ray transients, the quiescent light curves of Swift J1357.2-0933 do not show the secondary star's ellipsoidal modulation. The optical and infrared light curves is dominated by variability with an optical fractional rms of about 20 per cent, much larger than what is observed in other systems. The quiescent ultraviolet to mid-IR spectral energy distribution in quiescence is dominated by a nonthermal component with a power-law index of -1.4, (the broad-band rms SED has a similar index) which arises from optically thin synchrotron emission from a jet; the lack of a peak in the spectral energy distribution rules out advection-dominated models (based on [19]).

Original languageEnglish (US)
Article number03007
JournalEPJ Web of Conferences
StatePublished - 2013
EventInternational Symposium on the Innermost Regions of Relativistic Jets and Their Magnetic Fields - Granada, Spain
Duration: Jun 10 2013Jun 14 2013

ASJC Scopus subject areas

  • General Physics and Astronomy


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