Astronomy and Astrophysics – Astrophysics
Scientific paper
2005-07-21
Mon.Not.Roy.Astron.Soc.362:975-982,2005
Astronomy and Astrophysics
Astrophysics
9 pages, 6 figures, accepted by MNRAS
Scientific paper
10.1111/j.1365-2966.2005.09361.x
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 lightcurves are rapid flare events which typically last a few minutes. The power density spectrum of the lightcurves can be described by a broken power-law model with a break frequency at ~2 mHz or a power-law model plus a broad quasi-periodic oscillation (QPO) at ~2 mHz. In the context of the cellular-automaton we estimate the size of the quiescent advection-dominated flow (ADAF) region to be ~10^4 Schwarzschild radii, similar to that observed in other quiescent black hole X-ray transients, suggesting the same underlying physics. The similarites between the low/hard and quiescent state PDS suggest a similar origin for the optical and X-ray variability, most likely from regions at/near the ADAF.
Casares Jorge
Charles Phil A.
Dhillon Vik S.
Haswell Carole A.
Hynes Robert I.
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