Multiwavelength observations revealing the outbursts of the two soft X-ray transients XTE J1859+226 and XTE J1118+480

Chaty, S.; Haswell, C.A.; Hynes, R.I.; Shrader, C.R.; Cui, W.; Mauche, C.W.; Norton, A.J.; Solheim, J-E.; Østensen, R.; Geballe, T.R.; Ioannou, Z. and King, A.R. (2001). Multiwavelength observations revealing the outbursts of the two soft X-ray transients XTE J1859+226 and XTE J1118+480. In: Exploring the gamma-ray universe (Battrick, B.; Gimenez, A.; Reglero, V. and Winkler, C. eds.), Proceedings of the Fourth INTEGRAL Workshop, 4-8 September 2000, Alicante, Spain, ESA Publications Division, Noordwijk, pp. 491–494.

URL: http://adsabs.harvard.edu/cgi-bin/nph-bib_query?bi...

Abstract

We report here on multiwavelength observations of the two new soft X-ray transients (SXTs) XTE J1859+226 and XTE J1118+480, which we observed with HST/RXTE/UKIRT. For XTE J1118+480 we also used EUVE since it is located at a very low extinction. The two sources exhibited very different behaviour. XTE J1859+226 seems quite normal and therefore a good object for testing the accretion mechanisms in place during the outbursts, XTE J1118+480 is much more unusual because it exhibits I) a low X-ray to optical ratio and II) a strong non-thermal contribution in the radio to optical domain, which is likely to be due to synchrotron emission. We concentrate here on the near-infrared (NIR) and optical observations of these two sytems.

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