Abstract
Previouswork by Motch et al. [1985, Space Sci. Rev. 40, 219] suggested that in the low/hard state of GX 339-4, the soft X-ray power-law extrapolated backward in energy agrees with the IR flux level. Corbel and Fender [2002, ApJ 573, L35—L39] later showed that the typical hard state radio power-law extrapolated forward in energy meets the backward extrapolated X-ray power-law at an IR spectral break, which was explicitly observed twice in GX 339-4. This has been cited as further evidence that jet synchrotron radiation might make a significant contribution to the observed X-rays in the hard state. We explore this hypothesis with a series of simultaneous radio/X-ray hard state observations of GX 339-4.We fit these spectra with a simple, but remarkably successful, doubly broken power-lawmodel that indeed requires a spectral break in the IR. For most of these observations, the break position as a function of X-ray flux agrees with the jet model predictions.We then examine the radio flux/X-ray flux correlation in Cyg X-1 through the use of 15 GHz radio data, obtained with the Ryle radio telescope, and Rossi X-ray Timing Explorer data, from the All Sky Monitor and pointed observations. We find evidence of ‘parallel tracks’ in the radio/X-ray correlation which are associated with ‘failed transitions’ to, or the beginning of a transition to, the soft state. We also find that for Cyg X-1 the radio flux is more fundamentally correlated with the hard, rather than the soft, X-ray flux.
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Nowak, M. (2005). X-ray and radio monitoring of GX 339-4 and CYG X-1. In: Maccarone, T.J., Fender, R.P., Ho, L.C. (eds) Astrophysics and Space Science. Springer, Dordrecht. https://doi.org/10.1007/1-4020-4085-7_19
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DOI: https://doi.org/10.1007/1-4020-4085-7_19
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Online ISBN: 978-1-4020-4085-6
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