Multiwavelength spectral and high time resolution observations of SWIFTJ1753.5-0127: new activity?

Durant, M.; Gandhi, P.; Shahbaz, T.; Peralta, H. H.; Dhillon, V. S.
Bibliographical reference

Monthly Notices of the Royal Astronomical Society, Volume 392, Issue 1, pp. 309-324.

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1
2009
Number of authors
5
IAC number of authors
3
Citations
48
Refereed citations
40
Description
We have conducted an extensive observational campaign of SWIFTJ1753.5-0127 during 2007 June after its bright outburst episode in 2005. We have performed multiband optical photometry, optical spectroscopy, X-ray spectroscopy and timing and ULTRACAM optical photometry simultaneously in three bands. Both the optical spectrum and the X-ray spectrum along with enhanced brightness in broad-band photometry point to recent increased activity. We analyse the different spectral regions, finding a smooth optical continuum with a remarkable lack of lines and a very blue component modulated with a period of 3.2h and a hard power-law X-ray spectrum. Both the X-ray and optical power spectra are flat at low frequencies up to the 0.1Hz (10s) range, then decreasing roughly as a power law consistent with flickering. Furthermore, the optical data show quasi-periodic oscillations near 0.08Hz (13s). Together with a dynamical and autocorrelation analysis of the light curves we attempt to construct a complete physical picture of this intriguing system.
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