Journal
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Volume 362, Issue 3, Pages 975-982Publisher
OXFORD UNIV PRESS
DOI: 10.1111/j.1365-2966.2005.09361.x
Keywords
accretion, accretion discs; binaries : close; stars : individual : XTE J1118+480
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We present high time-resolution multicolour observations of the quiescent soft X-ray transient XTE J1118+480 obtained with ULTRACAM. Superimposed on the double-humped continuum g'- and i'-band light curves are rapid flare events which typically last a few minutes. The power density spectrum of the light curves can be described by a broken power-law model with a break frequency at similar to 2 mHz or a power-law model plus a broad quasi-periodic oscillation at similar to 2 mHz. In the context of the cellular automaton we estimate the size of the quiescent advection-dominated accretion flow (ADAF) region to be similar to 10(4) Schwarzschild radii, similar to that observed in other quiescent black hole X-ray transients, suggesting the same underlying physics. The similarities between the low/hard and quiescent-state power density spectrum suggest a similar origin for the optical and X-ray variability, most likely from regions at or near the ADAF.
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