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ULTRACAM observations of the black hole X-ray transient XTE J1118+480 in quiescence
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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. doi:10.1111/j.1365-2966.2005.09361.x ISSN 0035-8711.
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Official URL: http://dx.doi.org/10.1111/j.1365-2966.2005.09361.x
Abstract
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 | ||||
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Subjects: | Q Science > QB Astronomy | ||||
Journal or Publication Title: | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | ||||
Publisher: | BLACKWELL PUBLISHING | ||||
ISSN: | 0035-8711 | ||||
Official Date: | 21 September 2005 | ||||
Dates: |
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Volume: | 362 | ||||
Number: | 3 | ||||
Number of Pages: | 8 | ||||
Page Range: | pp. 975-982 | ||||
DOI: | 10.1111/j.1365-2966.2005.09361.x | ||||
Publication Status: | Published |
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