Author/Authors :
Boer، J. A. M. de نويسنده , , Lamb، D. Q. نويسنده , , Ricker، G. R. نويسنده , , Atteia، J.-L. نويسنده , , Kawai، N. نويسنده , , Vanderspek، R. نويسنده , , Hurley، K. نويسنده , , Pizzichini، G. نويسنده , , Olive، J.-F. نويسنده , , Barraud، C. نويسنده , , Lestrade، J. P. نويسنده , , Dezalay، J.-P. نويسنده ,
Abstract :
We present the results of a long-term study of the black hole candidate GX 339-4 using simultaneous radio (from the Australia Telescope Compact Array) and X-ray (from the Rossi X-ray Timing Explorer and BeppoSAX) observations performed between 1997 and 2000. We find strong evidence for a correlation between these two emission regimes that extends over more than three decades in X-ray flux, down to the quiescence level of GX 339-4. This is the strongest evidence to date for such strong coupling between radio and X-ray emission. We discuss these results in light of a jet model that can explain the radio/Xray correlation. This could indicate that a significant fraction of the X-ray flux that is observed in the low-hard state of black hole candidates may be due to optically thin synchrotron emission from the compact jet.
