Echoes in X-ray Binaries: Mapping the Accretion Flow

Abstract

In X-ray binaries much of the optical/UV emission arises from X-rays reprocessed by material in the accretion disc, stream and the companion star. The resulting reprocessed variability will be delayed in time with respect to the X-ray variability by an amount depending on the position of the reprocessing regions. From this, we can determine a range of time-delays present in the system. This time-delay transfer function can be used to ‘echo-map’ the geometry of the reprocessing regions in the binary system.

We present our modeling of this transfer function and show results from our echomapping campaign using X-ray lightcurves from RXTE, simultaneous with HST. In the X-ray transient, GROJ1655-40, shortly after the 1996 outburst, we find evidence for reprocessing in the outer regions of a thick accretion disc.