The 2003 Outburst of the Black Hole Binary V4641 Sgr (=SAX 1819.3-2525)

Details The 2003 Outburst of the Black Hole Binary V4641 Sgr (=SAX 1819.3-2525) The 2003 Outburst of the Black Hole Binary V4641 Sgr (=SAX 1819.3-2525)

Dec 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003aas...203.8105b&link_type=abstract

American Astronomical Society Meeting 203, #81.05; Bulletin of the American Astronomical Society, Vol. 35, p.1332

Astronomy and Astrophysics

Astronomy

Scientific paper

V4641 Sgr is a binary system consisting of a black hole and a Roche-lobe filling B star (Orosz et al. 2002 ApJ 568, 845). The system is an X-ray transient, and underwent a short outburst in August 2003. We report X-ray, optical and IR observations of this outburst. The X-ray lightcurve shows flares of >100 mCrab on timescales as short as 1 second. The optical/IR lightcurve is also highly variable. Simultaneous optical/X-ray observations show strong correlations, with the optical somewhat delayed and smoothed compared to the X-ray. This behavior can be explained if the optical emission comes from X-rays reprocessed by the accretion disk.

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