Bibcode
Brocksopp, C.; Jonker, P. G.; Maitra, D.; Krimm, H. A.; Pooley, G. G.; Ramsay, G.; Zurita, C.
Bibliographical reference
Monthly Notices of the Royal Astronomical Society, Volume 404, Issue 2, pp. 908-916.
Advertised on:
5
2010
Citations
25
Refereed citations
24
Description
The black hole X-ray transient, XTE J1118+480, has now twice been
observed in outbursts - 2000 and 2005 - and on both occasions remained
in the low/hard X-ray spectral state. Here we present radio, infrared,
optical, soft X-ray and hard X-ray observations of the more recent
outburst. We find that the light curves have very different morphologies
compared with the 2000 event and the optical decay is delayed relative
to the X-ray/radio. We attribute this lesser degree of correlation to
contributions of emission from multiple components, in particular the
jet and accretion disc. Whereas the jet seemed to dominate the
broad-band spectrum in 2000, in 2005 the accretion disc seemed to be
more prominent and we use an analysis of the light curves and spectra to
distinguish between the jet and disc emission. There also appears to be
an optically thin component to the radio emission in the 2005 data,
possibly associated with multiple ejection events and decaying as the
outburst proceeds. These results add to the discussion that the term
`low/hard state' covers a wider range of properties than previously
thought, if it is to account for XTE J1118+480 during these two
outbursts.
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