Astronomy and Astrophysics – Astrophysics
Scientific paper
2004-10-04
Mon.Not.Roy.Astron.Soc. 356 (2005) 531-544
Astronomy and Astrophysics
Astrophysics
15 pages, 8 figures. Accepted for publication by MNRAS
Scientific paper
10.1111/j.1365-2966.2004.08471.x
High velocity outflows from supermassive black holes have been invoked to explain the recent identification of strong absorption features in the hard X-ray spectra of several quasars. Here, Monte Carlo radiative transfer calculations are performed to synthesise X-ray spectra from models of such flows. It is found that simple, parametric bi-conical outflow models with plausible choices for the wind parameters predict spectra that are in good qualitative agreement with observations in the 2 - 10 keV band. The influence on the spectrum of both the mass-loss rate and opening angle of the flow are considered: the latter is important since photon leakage plays a significant role in establishing an ionization gradient within the flow, a useful discriminant between spherical and conical outflow for this and other applications. Particular attention is given to the bright quasar PG1211+143 for which constraints on the outflow geometry and mass-loss rate are discussed subject to the limitations of the currently available observational data.
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