Effects of Downscattering on the Continuum and Line Spectra in Powerful Wind Environment. Monte Carlo Simulations, Analytical Results and Data Analysis

In Paper by Titarchuk & Shrader the general formulation and results for photon reprocessing (downscattering) that included recoil and Comptonization effects due to divergence of the flow were presented. Here we show the Monte Carlo (MC) simulated continuum and line spectra. We also provide an analytical description of the simulated continuum spectra using the diffusion approximation. We have simulated the propagation of monochromatic and continuum photons in a bulk outflow from a compact object. Electron scattering of the photons within the expanding flow leads to a decrease of their energy which is of first order in V/c (where V is the outflow velocity). The downscattering effect of first order in V/c in the diverging flow is explained by semi-analytical calculations and confirmed by MC simulations. We conclude that redshifted lines and downscattering bumps are intrinsic properties of the powerful outflows for which Thomson optical depth is greater than one. We fitted our model line profiles to the observations using four free parameters, β = V/c, optical depth of the wind τ , the wind temperature kTe and the original line photon energy E0. We show how the primary spectrum emitted close to the black hole is modified by reprocessing in the warm wind. In the framework of the our wind model the fluorescent iron line Kα is formed in the partly ionized wind as a result of illumination by central source continuum photons. The demonstrated application of our outflow model CEA/DSM/DAPNIA/SAp, CEA Saclay, 91191 Gif sur Yvette, France; Fédération APC, Collège de France, 75231 Paris, France;[email protected] Fédération APC, Collège de France, 75231 Paris, France George Mason University/Center for Earth Observing and Space Research, Fairfax, VA 22030; and US Naval Research Laboratory, Code 7655, Washington, DC 20375-5352; [email protected] NASA/ Goddard Space Flight Center, code 660, Greenbelt MD 20771, [email protected]