Initial low/hard state, multiple jet ejections and X-ray/radio correlations during the outburst of XTE J1859+226 |
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| Authors: | CBrocksopp R PFender MMcCollough G GPooley M PRupen R MHjellming C Jde la Force R ESpencer T W BMuxlow S TGarrington STrushkin |
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| Institution: | 1Astrophysical Research Institute, Liverpool John Moores University, 12 Quays House, Egerton Wharf, Birkenhead CH41 1LD; 2Astronomical Institute 'Anton Pannekoek' and Center for High-Energy Astrophysics, University of Amsterdam, Kruislaan 403, 1098 SJ Amsterdam, the Netherlands; 3Universities Space Research Association, Huntsville, AL 35812, USA; 4Mullard Radio Astronomy Observatory, Cavendish Laboratory, Madingley Road, Cambridge CB3 0HE; 5National Radio Astronomy Observatory, PO Box O, Socorro, NM 87801, USA; 6Jodrell Bank Observatory, Macclesfield, Cheshire SK11 9DL; 7Special Astrophysical Observatory, RAS, Nizhnij Arkhyz, Karachaevo-Cherkassia 369167, Russia |
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| Abstract: | We have studied the 1999 soft X-ray transient outburst of XTE J1859+226 at radio and X-ray wavelengths. The event was characterized by strong variability in the disc, corona and jet – in particular, a number of radio flares (ejections) took place and seemed well-correlated with hard X-ray events. Apparently unusual for the canonical 'soft' X-ray transient, there was an initial period of low/hard state behaviour during the rise from quiescence but prior to the peak of the main outburst – we show that not only could this initial low/hard state be a ubiquitous feature of soft X-ray transient outbursts, but also it could be extremely important in our study of outburst mechanisms. |
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| Keywords: | accretion accretion discs stars: individual: XTE J1859+226 X-rays: stars |
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