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

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

We present high time-resolution ULTRACAM optical and NOTCam infrared observations of the edge-on black hole X-ray transient Swift J1357.2-0933. Our data taken in 2012 and 2013 show 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 โ€ฆ