Curran, P.A., Miller-Jones, J.C.A., Rushton, A.P., Pawar, D.D., Anderson, G.E., Altamirano, D., Krimm, H.A., Broderick, J.W., Belloni, T.M., Fender, R.P., Kording, E.G., Maitra, D., Markoff, S., Migliari, S., Rumsey, C., Rupen, M.P., Russell, D.M., Sarazin, C.L., Sivakoff, G.R., Soria, R., Tetarenko, A.J., Titterington, D. and Tudose, V. (2015) Radio polarimetry as a probe of unresolved jets: the 2013 outburst of XTE J1908+094. Monthly Notices of the Royal Astronomical Society, 451 (4), 3975-3985. (doi:10.1093/mnras/stv1252).
Abstract
XTE J1908+094 is an X-ray transient black hole candidate in the Galactic plane that was observed in outburst in 2002 and 2013. Here we present multifrequency radio and X-ray data, including radio polarimetry, spanning the entire period of the 2013 outburst. We find that the X-ray behaviour of XTE J1908+094 traces the standard black hole hardness–intensity path, evolving from a hard state, through a soft state, before returning to a hard state and quiescence. Its radio behaviour is typical of a compact jet that becomes quenched before discrete ejecta are launched during the late stages of X-ray softening. The radio and X-ray fluxes, as well as the light-curve morphologies, are consistent with those observed during the 2002 outburst of this source. The polarization angle during the rise of the outburst infers a jet orientation in agreement with resolved observations but also displays a gradual drift, which we associate with observed changes in the structure of the discrete ejecta. We also observe an unexpected 90° rotation of the polarization angle associated with a second component.
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