Radio / X-ray correlation in the low/hard state of GX 339--4
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/X-ray 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.
Cite
@article{arxiv.astro-ph/0301436,
title = {Radio / X-ray correlation in the low/hard state of GX 339--4},
author = {S. Corbel and M. A. Nowak and R. P. Fender and A. K. Tzioumis and S. Markoff},
journal= {arXiv preprint arXiv:astro-ph/0301436},
year = {2008}
}
Comments
8 pages. Accepted for publication in Astronomy & Astrophysics, 2003