EM144
The black-hole X-ray binary GRS 1915+105 is currently undergoing an unusually long low X-ray flux phase. This phase is however associated to extreme radio flaring, with flux densities between tens and hundreds mJy and varying on a few hours time-scales. This is the first time that significant radio activity is apparently not associated with any X-ray flaring in GRS1915+105. Based on multi-vawelength observations of GRS1915+105 we argue that this source might have entered some sort of obscured mode, where the innermost portion of the accretion disc - which is feeding the radio jets and is emitting the variable X-ray emission - is shielded to the observer by an inflated disc. Here we propose to use the EVN+e-MERLIN to observe GRS1915+105 three times, for a total of 24hr, spread over the coming EVN sessions, in order to monitor the evolution of the radio jets in GRS1915+105, exploiting at high sensitivity that can be reached by the above array, and with high angular resolution, crucial to resolve possible extended jets. The resulting observations will allow to constrain the properties of the radio jets associated with this unusual accretion state.
Observation pages at the EVN archive:
This data is part of the archive of VLBI data maintained by JIVE on behalf of the EVN, a network of radio telescopes located primarily in Europe and Asia, with additional antennas in South Africa. The EVN archive itself has the DOI https://doi.org/10.17616/R3Z197