Astronomy and Astrophysics – Astrophysics
Scientific paper
2007-02-05
AIPConf.Proc.924:715-722,2007
Astronomy and Astrophysics
Astrophysics
Invited talk at `The Multicoloured Landscape of Compact Objects and their Explosive Origins', Cefalu', 2006 June 11-24 (AIP Co
Scientific paper
10.1063/1.2774932
The question whether quiescent black hole X-ray binaries are capable of powering relativistic outflows is addressed by means of simultaneous radio/X-ray observations of a nearby system steadily emitting X-rays below 1e-8 times the Eddington luminosity. The robust detection of a radio counterpart suggests that a synchrotron emitting outflow is being powered by this system, even though its degree of collimation remains unknown, and hard to investigate. With the inclusion of the A0620-00 data, the non linear radio/X-ray correlation for hard state black hole X-ray binaries appears to hold down to very low quiescent luminosities. However, an increasing number of outliers is being found at higher luminosities, questioning the universality of such correlation, or at least its normalization.
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