Speaker
Description
The outflow model is a very simple model, yet it explains quantitatively a number of very stringent correlations observed in black-hole X-ray binaries, some of which have not been explained by any other model. It is interesting that all these correlations are explained with only two parameters with values in two narrow ranges. What is more interesting is that the model makes three quantitative predictions for the source GX 339-4. These are: 1) the time-lag of the hard X-ray photons (6 – 15 keV) with respect to softer ones (2 – 6 keV) should increase at all Fourier frequencies as the source moves from the low-hard state, to the hard state proper, to the hard-intermediate state (HIMS). 2) The radio flux as a function of the X-ray photon-number spectral index Gamma, during the rise of an outburst, should be a bell-shaped curve with its maximum in the HIMS. 3) The well-known radio – X-ray correlation should break down at the end of the hard state and after that the radio flux should first increase suddenly and then decrease suddenly within a small range of the X-ray luminosity. The first prediction has been confirmed and I will discuss it. The other two predictions are awaiting publication of MeerKAT observations taken in 2024. Hopefully, these observations will be public by the time of the workshop and the model will either survive or it will be killed.
| Contribution | Oral talk |
|---|---|
| Affiliation | University of Crete, Greece |
| kylafis@physics.uoc.gr |
