Radio Emission from the X-ray transient XTE J1550-564
D. Hannikainen, K. Wu, Campbell-Wilson, R. Hunstead, J. Lovell, V. McIntyre, J. Reynolds, R. Soria, T. Tzioumis
Abstract
We report multifrequency radio observations of XTE J1550-564 obtained with the Molonglo Observatory Synthesis Telescope and the Australia Telescope Compact Array at the time of its discovery and subsequent hard and soft X-ray outburst in 1998 September. A large radio flare was observed, peaking about 1.8 days after the X-ray flare. In addition, we present Australian Long Baseline Array images obtained shortly after the maximum of the radio flare which show evolving structure. The apparent separation velocity of the two outermost components is v>2c.
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