Multiwavelength Observations of the Black Hole Candidate XTE J1550-564 during the 2000 Outburst

Details Multiwavelength Observations of the Black Hole Candidate XTE J1550-564 during the 2000 Outburst Multiwavelength Observations of the Black Hole Candidate XTE J1550-564 during the 2000 Outburst

2001-05-07

arxiv.org/abs/astro-ph/0105115v1

Astronomy and Astrophysics

Astrophysics

12 pages, 3 figs, accepted for publications in ApJ Letters

Scientific paper

10.1086/321700

We report optical, infrared, and X-ray light curves for the outburst, in 2000, of the black hole candidate XTE J1550-564. We find that the start of the outburst in the H and V bands precedes that seen in the RXTE All Sky Monitor by 11.5 +/- 0.9 and 8.8 +/- 0.6 days, respectively; a similar delay has been observed in two other systems. About 50 days after the primary maxima in the VIH light curves, we find secondary maxima, most prominently in H. This secondary peak is absent in the X-ray light curve, but coincides with a transition to the low/hard state. We suggest that this secondary peak may be due to non-thermal emission associated with the formation of a jet.

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