Initial low/hard state, multiple jet ejections and X-ray/radio correlations during the outburst of XTE J1859+226
C. BrocksoppR. P. FenderAstronomical Institute ‘Anton Pannekoek’ and Center for High-Energy Astrophysics, University of Amsterdam, Kruislaan 403, 1098 SJ Amsterdam, the NetherlandsM. McColloughUniversities Space Research Association, Huntsville, AL 35812, USAG. G. PooleyM. P. RupenNational Radio Astronomy Observatory, PO Box O, Socorro, NM 87801, USAR. M. HjellmingNational Radio Astronomy Observatory, PO Box O, Socorro, NM 87801, USAC. J. de la ForceJodrell Bank Observatory, Macclesfield, Cheshire SK11 9DLR. E. SpencerJodrell Bank Observatory, Macclesfield, Cheshire SK11 9DLT. W. B. MuxlowJodrell Bank Observatory, Macclesfield, Cheshire SK11 9DLS. T. GarringtonJodrell Bank Observatory, Macclesfield, Cheshire SK11 9DLS. TrushkinSpecial Astrophysical Observatory, RAS, Nizhnij Arkhyz, Karachaevo-Cherkassia 369167, Russia
2002en
ABI
Аннотация
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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