AAS 203rd Meeting, January 2004
Session 81 Black Holes
Poster, Wednesday, January 7, 2004, 9:20am-6:30pm, Grand Hall

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[81.03] SMARTS/YALO Observations of the BH Candidates 4U1543-47 & GX 339-4: Evidence for Jet Emission?

M.M. Buxton, C.D. Bailyn (Yale University)

We present our simultaneous optical and IR observations of black-hole X-ray binaries 4U 1543-47 and GX 339-4. Observations were obtained by the YALO and SMARTS consortia when both objects were declining in soft X-rays. The most interesting feature of the data is a secondary outburst in the optical and IR light curves with no corresponding rise in the ASM X-ray light curve. In the case of 4U 1543-47 a radio detection was made at the peak of the secondary outburst.

A possible source of this optical/IR reflare is synchrotron radiation emitted from a jet. We explore this hypothesis in this poster and compare our results to another black-hole candidate with similar behaviour, XTE J1550-564.

This study is supported by the NSF.

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© 2003. The American Astronomical Soceity.