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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
Steady jets from radiatively efficient hard states in GRS1915+105
Astronomy and Astrophysics, Volume 524, No. 5, Article A29, Year 2010
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Description
Recent studies of different X-ray binaries (XRBs) have shown a clear correlation between the radio and X-ray emission. We present evidence of a close relationship found between the radio and X-ray emission at different epochs for GRS 1915+105, using observations from the Ryle Telescope and Rossi X-ray Timing Explorer satellite. The strongest correlation was found during the hard state (also known as the "plateau" state), where a steady AU-scale jet is known to exist. Both the radio and X-ray emission were found to decay from the start of most plateau states, with the radio emission decaying faster. An empirical relationship of was then fitted to data taken only during the plateau state, resulting in a power-law index of ξ ~ 1.7 ± 0.3, which is significantly higher than in other black hole XRBs in a similar state. An advection-flow model was then fitted to this relationship and compared to the universal XRB relationship as described by Gallo et al. (2003, MNRAS, 344, 60). We conclude that either (I) the accretion disk in this source is radiatively efficient, even during the continuous outflow of a compact jet, which could also suggest a universal turn-over from radiatively inefficient to efficient for all stellar-mass black holes at a critical mass accretion rate (M c≈1018.5 g/s); or (II) the X-rays in the plateau state are dominated by emission from the base of the jet and not the accretion disk (e.g. via inverse Compton scattering from the outflow). © 2010 ESO.
Authors & Co-Authors
Rushton, Anthony P.
Sweden, Onsala
Onsala Space Observatory
Germany, Garching Bei Munchen
European Southern Observatory
Spencer, Ralph E.
United Kingdom, Manchester
The University of Manchester
Fender, Robert P.
United Kingdom, Southampton
University of Southampton
Netherlands, Amsterdam
Universiteit Van Amsterdam
Pooley, Guy G.
United Kingdom, Cambridge
Department of Physics
Statistics
Citations: 42
Authors: 4
Affiliations: 6
Identifiers
Doi:
10.1051/0004-6361/201014929
ISSN:
14320746
Research Areas
Environmental