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The Ultra Luminous X-ray (ULX) source HLX-1 in the galaxy ESO 243-49 has anobserved maximum unabsorbed X-ray luminosity of 1.3e42 erg/s (0.2-10.0 keV).From the conservative assumption that this value exceeds the Eddington limit byat most a factor of 10, the minimum mass is then 500 solar masses. The X-rayluminosity varies by a factor of 40 with an apparent recurrence timescale ofapproximately one year. This X-ray variability is associated with spectralstate transitions similar to those seen in black hole X-ray binaries. Here wediscuss our recent modelling of all the X-ray data for HLX-1 and show that itsupports the idea that this ULX is powered by sub- and near Eddington accretiononto an intermediate mass black hole. We also present evidence for transientradio emission which is consistent with a discrete jet ejection event as wellas comment on the nature of the environment around HLX-1 in light of recentHubble Space Telescope photometry.

The accretion disc, jets and environment of the intermediate mass black hole candidate ESO 243-49 HLX-1