ULTRACAM observations of the black hole X-ray transient XTE J1118+480 in quiescence
UNSPECIFIED. (2005) ULTRACAM observations of the black hole X-ray transient XTE J1118+480 in quiescence. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 362 (3). pp. 975-982. ISSN 0035-8711Full text not available from this repository.
Official URL: http://dx.doi.org/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 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.
|Item Type:||Journal Article|
|Subjects:||Q Science > QB Astronomy|
|Journal or Publication Title:||MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY|
|Date:||21 September 2005|
|Number of Pages:||8|
|Page Range:||pp. 975-982|
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