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ULTRACAM observations of the black hole X-ray transient XTE J1118+480 in quiescence | | T. Shahbaz
; V.S. Dhillon
; T.R. Marsh
; J. Casares
; C. Zurita
; P.A. Charles
; C.A. Haswell
; R.I. Hynes
; | | Date: |
21 Jul 2005 | | Journal: | Mon.Not.Roy.Astron.Soc. 362 (2005) 975-982 | | Subject: | astro-ph | | Affiliation: | Instituto de Astrofisica de Canarias, University of Sheffield, University of Warwick, Observatorio Astronomico de Lisboa, South African Astronomical Observatory, The Open University, Louisiana State University | | 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 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. | | Source: | arXiv, astro-ph/0507511 | | Services: | Forum | Review | PDF | Favorites | |
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