2009MNRAS.399..281H -
Mon. Not. R. Astron. Soc., 399, 281-286 (2009/October-2)
Echo mapping of Swift J1753.5-0127.
HYNES R.I., O'BRIEN K., MULLALLY F. and ASHCRAFT T.
Abstract (from CDS):
We present two epochs of coordinated X-ray-optical timing observations of the black hole candidate Swift J1753.5-0127 during its 2005 outburst. The first epoch in July occurred at outburst peak. Two consecutive nights of observations using the McDonald Observatory Argos camera with the Rossi X-ray Timing Explorer show a consistent correlation with an immediate response and an extended tail lasting ∼5s. The properties of the variability and the correlation are consistent with thermal reprocessing in an accretion disc. The shortness of the lag suggests a short orbital period consistent with that recently claimed. The second epoch in August used the Very Large Telescope Focal Reducer/low dispersion Spectrograph 2 (FORS2) High Time resolution (HIT) mode again in conjunction with RXTE. Again a repeatable correlation is seen between two independent subsets of the data. In this case, though, the cross-correlation function has an unusual structure comprising a dip followed by a double peak. We suggest that this may be equivalent to the dip plus single-peak structure seen by Kanbach et al. (2001) in XTE J1118+480 and attributed there to synchrotron emission; a similar structure was seen during later activity of Swift J1753.5-0127 by Durant et al. (2008).
Abstract Copyright:
© 2009 The Authors. Journal compilation © 2009 RAS
Journal keyword(s):
accretion, accretion discs - binaries: close - stars: individual: Swift J1753.5-0127
Simbad objects:
3
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