SWIFT J1753.5−0127: a surprising optical/X-ray cross-correlation function
نویسنده
چکیده
We have conducted optical and X-ray simultaneous observations of SWIFT J1753.5−0127 with RXTE and ULTRACAM, while the system persisted in its relatively bright low/hard state. In the cross-correlation function (CCF), we find that the optical leads the X-rays by a few seconds with a broad negative peak, and has a smaller positive peak at positive lags. This is markedly different from what was seen for the similarly interesting system XTE J1118+480, and the first time such a correlation function has been so clearly measured. We suggest a physical scenario for its origin.
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