Applying Magnetized Accretion-Ejection Models to Microquasars: a preliminary step

Abstract

We present in this proceeding some aspects of a model that should explain the spectral state changes observed in microquasars. In this model, ejection is assumed to take place only in the innermost disc region where a large scale magnetic field is anchored. Then, in opposite to conventional ADAF models, the accretion energy can be efficiently converted in ejection and not advected inside the horizon. We propose that changes of the disc physical state (e.g. transition from optically thick to optically thin states) can strongly modify the magnetic accretion-ejection structure resulting in the spectral variability. After a short description of our scenario, we give some details concerning the dynamically self-consistent magnetized accretion-ejection model used in our computation. We also present some preliminary results of spectral energy distribution.Comment: Proceeding of the fith Microquasar Workshop, June 7 - 13, 2004, Beijing, China. Accepted for publication in the Chinese Journal of Astronomy and Astrophysic