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The black hole candidate, XTE J1752-223, was discovered in 2009 October whenit entered an outburst. We obtained radio data from the Australia TelescopeCompact Array for the duration of the ~9 month event. The lightcurves show thatthe radio emission from the compact jet persisted for the duration of anextended hard state and through the transition to the intermediate state. Theflux then rose rapidly by a factor of 10 and the radio source entered a seriesof at least 7 maxima, the first of which was likely to be emission associatedwith the compact jet. The subsequent 6 flares were accompanied by variablebehaviour in terms of radio spectrum, degree of linear polarisation, morphologyand associated X-ray behaviour. They were, however, remarkably similar in termsof the estimated minimum power required to launch such an ejection event. Wecompare the timing of radio peaks with the location of the ejecta, imaged bycontemporaneous VLBI experiments. We then discuss the mechanism behind theevents, in terms of whether discrete ejections is the most likely descriptionof the behaviour. One ejection, at least, appears to be travelling withapparent superluminal motion. The range of properties, however, suggests thatmutiple mechanisms may be relevant and that at least some of the emission iscoming from shocked interactions amongst the ejecta and between the ejecta andthe interstellar medium. We also compare the radio flux density with the X-raysource during the hard state and conclude that XTE J1752-223 is aradio-weak/X-ray-bright outlier on the universal correlation for black holetransient sources.

XTE J1752-223 in outburst: a persistent radio jet, dramatic flaring, multiple ejections and linear polarisation