The effects of electron scattering opacity in the broad emission-line regions of quasars

Astronomy and Astrophysics – Astrophysics

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Astronomical Models, Electron Scattering, Emission Spectra, Optical Thickness, Quasars, Spectral Line Width, Brightness Distribution, Radiation Transport, Surface Properties

Scientific paper

It is shown that the standard two-phase model of the broad emission-line region in quasars predicts that much of the region is optically thick to electron scattering. It is then demonstrated that three observational puzzles: nearly symmetric Lyα profiles, weakly asymmetric C IV λ1549, and offsets between the peaks of these high ionization lines and the systemic velocity, can all be explained by the standard model of the physical state of the broad-line region (an intercloud medium in rough pressure balance with the line-emitting clouds and a temperature not too far from Comptonization equilibrium) with the addition of the simplest imaginable kinematics. Electron scattering in the intercloud medium is the essential ingredient that had been previously neglected.

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