A decade of high-resolution radio observations of GRS 1915+105

Details A decade of high-resolution radio observations of GRS 1915+105 A decade of high-resolution radio observations of GRS 1915+105

2009-10-09

arxiv.org/abs/0910.1779v1

Astronomy and Astrophysics

Astrophysics

Galaxy Astrophysics

13 pages, 6 figures, 2 tables to be published in MNRAS

Scientific paper

The radio emitting X-ray binary GRS 1915+105 shows a wide variety of X-ray and radio states. We present a decade of monitoring observations, with the RXTE-ASM and the Ryle Telescope, in conjunction with high-resolution radio observations using MERLIN and the VLBA. Linear polarisation at 1.4 and 1.6 GHz has been spatially resolved in the radio jets, on a scale of ~150 mas and at flux densities of a few mJy. Depolarisation of the core occurs during radio flaring, associated with the ejection of relativistic knots of emission. We have identified the ejection at four epochs of X-ray flaring. Assuming no deceleration, proper motions of 16.5 to 27 mas per day have been observed, supporting the hypothesis of a varying angle to the line-of-sight per ejection, perhaps in a precessing jet.

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