The JEDSAD model: X-ray spectral shape, HID and radio-X fits

The hysteresis behavior of X-ray binaries during their outbursts remains a mystery. We have developed a paradigm where the disk material accretes in two possible, mutually exclusive, ways: the usual alpha-disk mode and a jet-emitting disk mode, where magnetically-driven jets carry away mass, energy, and all the angular momentum vertically (Ferreira et al. 2006, Marcel et al. 2018a,b). I will show how this paradigm can reproduce most spectral states of X-ray binaries. We built JED-SAD model tables usable in Xspec, and we applied for the first time direct fitting procedures to the hard states of 4 outbursts of GX339-4 observed during the 2000-2010 decade (RXTE PCA X-ray spectra). Combined with simultaneous or quasi simultaneous (less than 1 day) radio observations, we were able to study simultaneously the radiative properties of the accretion flow and the jet. We show that the functional dependency of the radio emission on the model parameters (mainly the accretion rate and the transition radius between the JED and the SAD) in the rising phases of the outburst is significantly different from the functional dependency obtained in the decaying phases. This result strongly suggests a change in the radiative and/or dynamical properties of the ejection between the beginning and the end of the outburst (Barnier et al. 2021).
{"references":["Barnier et al. (2021) arxiv:2109.02895","Marcel and Neilsen (2021) arxiv:2011.09032","Marino et al. (2021) arxiv:2109.00218","Ferreira (1997) arxiv:astro-ph/9607057","Ferreira et al. (2006) arxiv:astro-ph/0511123","Petrucci et al. (2008) arxiv:0712.3388","Petrucci et al. (2010) arxiv:1007.1478","Marcel et al. (2018a) arxiv:1803.04335","Marcel et al. (2018b) arxiv:1805.12407","Marcel et al. (2019) arxiv:1905.05057","Scepi et al. (2020) arxiv:2007.07277","Liska et al. (2020) arxiv:1809.04608","Jacquemin-Ide et al. (2021) arxiv:2011.14782"]}