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P. A. Curran, J. C. A. Miller-Jones, A. P. Rushton, D. D. Pawar, G. E. Anderson, D. Altamirano, H. A. Krimm, J. W. Broderick, T. M. Belloni, R. P. Fender, E. G. Koerding, D. Maitra, S. Markoff, S. Migliari, C. Rumsey, M. P. Rupen, D. M. Russell, T. D. Russell et al. . Radio polarimetry as a probe of unresolved jets: the 2013 outburst of XTE J1908+094. Monthly Notices of the Royal Astronomical Society, 451, p. 3975, 2015.

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 90deg rotation of the polarization angle associated with a second component.

Keywords: binaries: close, stars: individual: XTE J1908+094, X-rays: binaries, X-rays: bursts


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