Astronomy and Astrophysics – Astrophysics
Scientific paper
2000-03-30
Astronomy and Astrophysics
Astrophysics
19 pages, including 17 figures. Accepted for publication in Astronony and Astrophysics. In Press
Scientific paper
We report the results of a long-term campaign of radio, soft- and hard- X-ray observations of the galactic black hole candidate GX 339-4. In the Low-Hard X-ray state the system displays a strong 3-way linear correlation between soft- and hard-X-rays and radio emission, implying a coupling between the Comptonising corona and a radio-emitting compact jet. In this state the radio emission is linearly polarised at a level of around 2 %, with an almost constant polarisation angle, indicative of a favored axis in this system probably related to the compact jet and/or black hole spin axis. In the Off X-ray state the radio emission declines with the X-ray emission to below detectable levels, suggesting that it is simply a lower-luminosity version of the Low-Hard state. In the High-Soft state both the hard-X-ray and radio emission are suppressed. We also note that the transitions from the Low-Hard state to the High-Soft state (and the reverse) are possibly associated with discrete ejection(s) of expanding relativistic plasma.
Corbel Sephane
Durouchoux Ph.
Fender Rob P.
McIntyre Vince
Nowak Michael
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