Echo-Mapping of Swift J1753.5-0127
R.I. Hynes (Louisiana State Univ.), K. O'Brien (European Southern, Observatory), F. Mullally (Princeton), T. Ashcraft (Arizona State Univ.)

TL;DR
This study presents coordinated X-ray-optical timing observations of Swift J1753.5-0127 during its 2005 outburst, revealing correlated variability consistent with thermal reprocessing and suggesting a short orbital period, with complex cross-correlation features indicating possible synchrotron emission.
Contribution
First detailed multi-epoch timing analysis of Swift J1753.5-0127 linking optical and X-ray variability with implications for accretion processes.
Findings
Correlation consistent with thermal reprocessing in accretion disk
Short lag suggests a short orbital period
Unusual cross-correlation structure indicating possible synchrotron emission
Abstract
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 disk. The shortness of the lag suggests a short orbital period consistent with that recently claimed. The second epoch in August used the VLT FORS2 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…
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