SWIFT J1753.5-0127: A Surprising Optical/X-Ray Cross-Correlation Function
Abstract
We have conducted simultaneous optical and X-ray 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, we find that the optical emission, with a broad negative peak, leads the X-ray emission by a few seconds 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 it is the first time that such a correlation function has been so clearly measured. We suggest a physical scenario for its origin.
- Publication:
-
The Astrophysical Journal
- Pub Date:
- July 2008
- DOI:
- 10.1086/590906
- arXiv:
- arXiv:0806.2530
- Bibcode:
- 2008ApJ...682L..45D
- Keywords:
-
- binaries: general;
- stars: individual: SWIFT J1753.5–0127;
- Astrophysics
- E-Print:
- 10 page manuscript. Accepted for publication in ApJL