Journal Article

Multiwavelength spectral and high time resolution observations of SWIFT J1753.5−0127: new activity?

M. Durant, P. Gandhi, T. Shahbaz, H. H. Peralta and V. S. Dhillon

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 392, issue 1, pages 309-324
Published in print January 2009 | ISSN: 0035-8711
Published online December 2008 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-2966.2008.14044.x
Multiwavelength spectral and high time resolution observations of SWIFT J1753.5−0127: new activity?

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We have conducted an extensive observational campaign of SWIFT J1753.5−0127 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 3.2 h and a hard power-law X-ray spectrum. Both the X-ray and optical power spectra are flat at low frequencies up to the 0.1 Hz (10 s) range, then decreasing roughly as a power law consistent with flickering. Furthermore, the optical data show quasi-periodic oscillations near 0.08 Hz (13 s). Together with a dynamical and autocorrelation analysis of the light curves we attempt to construct a complete physical picture of this intriguing system.

Keywords: X-rays: binaries

Journal Article.  10561 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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