NONTHERMAL RADIATION FROM CYGNUS X-1 CORONA

The X-ray Corona and Jet of Cygnus X-1

Rxte Observation of Cygnus X–1: Iii. Implications for Compton Corona and Adaf Models

We have recently shown that a ‘sphere+disk’ geometry Compton corona model provides a good description of Rossi X-ray Timing Explorer (RXTE) observations of the hard/low state of Cygnus X–1. Separately, we have analyzed the temporal data provided by RXTE. In this paper we consider the implications of this timing analysis for our best-fit ‘sphere+disk’ Comptonization models. We focus our attentio...

Soft state of Cygnus X - 1 : stable disk and unstable corona

Two component X–ray spectra (soft multicolor black body plus harder power law) are frequently observed from accreting black holes. These components are presumably associated with the different parts of the accretion flow (optically thick and optically thin respectively) in the vicinity of the compact source. Timing analysis further suggests that most of the aperiodic variability of the X–ray fl...

Nonthermal Radiation Processes in X-ray Jets

Analytic approximations for synchrotron, synchrotron self-Compton (SSC), and external Compton (EC) processes are used to constrain model parameters for knot and hot-spot emission in extended jets of radio galaxies. Equipartition formulas are derived that relate the Doppler factor δ and comoving magnetic field B assuming a nonthermal synchrotron origin of the radio emission, and synchrotron, SSC...

The high-energy spectrum of Cygnus X–1: corona and jet contributions

We have analyzed six years of INTEGRAL observations of the BH binary Cygnus X-1. We report on the evolution of the physical parameters of the accretion flow across spectral transitions. In particular, we have used for the first time the new model BELM which gives constraints on the intensity of the magnetic field in the X-ray corona of BH binaries. We have found that in the softer states, the m...