Gravitational Microlensing and the Structure of Quasar Outflows

Abstract

We show that invaluable information on the structure of quasar outflows can be obtained by considering microlensing (ML) induced variability of absorption line troughs in lensed quasars. Depending on the structure and geometry of the outflowing gas, such extrinsic line variability can be manifested as changes to the equivalent width of the line as well as line profile distortions. Here we consider several physically distinct outflow models, having very similar spectral predictions, and show how ML induced absorption line variability can be used to distinguish between them. The merits of future systematic studies of these effects are exemplified.

6 pages, 6 figures (low resolution format), accepted for publication in ApJ

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• Q2237+0305 source structure and dimensions from light curves simulation
• Radio and X-ray emission from disc winds in radio-quiet quasars
• Influence of gravitational microlensing on broad absorption lines of QSOs: The case of the Fe K$\alpha$ line