![]() ![]() A possible explanation for this is a global-one armed oscillation or density perturbation propagating rapidly in the Be star's disk. They occur approximately twice per orbit and are not locked in orbital phase, unlike most Be/X-ray transient systems. These outbursts axe not regularly spaced. Since its discovery in 1998, XTE J1946+274 has undergone 13 outbursts. Our pulse timing analysis of BATSE and RXTE data indicates that the orbital period is approximately 169 days. Follow-up optical/IR observations resulted in the discovery of a Be star companion. XTE J1946+274 = GRO J1944+26 is a 15.8-s X-ray pulsar discovered simultaneously by the Rossi X-ray Timing Explorer (RXTE) and the Burst and Transient Source Experiment (BATSE) in September 1998. This would imply a substantially denser environment surrounding XTE J1908+094 than has been inferred to exist around the microquasar sources GRS 1915+105 and GRO J1655-40. From the timing of the appearance of the knots relative to the X-ray state transition, a 90° swing of the inferred magnetic field orientation, the asymmetric appearance of the knots, their complex and evolving morphology, and their low speeds, we interpret the knots as working surfaces where the jets impact the surrounding medium. This fades and becomes resolved out after 4 days, after which a second component appears to the north, moving in the opposite direction. We initially see only the southern component, whose evolution gives rise to a 15-mJy radio flare and generates the observed radio polarization. We show that following a hard-to-soft state transition, we detect moving jet knots that appear asymmetric in morphology and brightness, and expand to become laterally resolved as they move away from the core, along an axis aligned approximately -11° east of north. Here we report high angular resolution radio observations of the 2013 outburst of the black hole candidate X-ray binary system XTE J1908+094, using data from the Very Long Baseline Array and European VLBI Network. ![]() Tudose, V.īlack hole X-ray binaries undergo occasional outbursts caused by changing inner accretion flows. Resolved, expanding jets in the Galactic black hole candidate XTE J1908+094 ![]()
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