Microlensing and the Structure of X-ray Emitting Regions in QSOs

Details Microlensing and the Structure of X-ray Emitting Regions in QSOs Microlensing and the Structure of X-ray Emitting Regions in QSOs

Sep 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002aca....52..203j&link_type=abstract

Acta Astronomica, v.52, pp.203-215, (2002).

Mathematics

Logic

3

Galaxies: Active, Quasars: Emission Lines, Gravitational Lensing, Accretion, Accretion Disks

Scientific paper

We simulate microlensing of distant, multiply lensed quasars by stars in an intervening galaxy - lens. The calculations include the influence of the effect on the fluorescence Fe K alpha lines. We use standard source models, involving accretion disks and a hot, diffuse component, which explain the presence of the lines as a result of radiation reprocessing in a cold disk. In all calculations we use cosmological and macro-lens parameters relevant to the source MG J0414+0534, a quasar where the iron line has been observed by Chandra. We investigate probability distribution for the line equivalent width of the microlensed source and find its dependence on the source model parameters. We show that the probability of a high strengthening of the line (as measured by the equivalent width) decreases sharply with the size of the emitting region. We apply the results of our simulations to the source MG J0414+0534. We find that the observed behavior of the source is not easy to reproduce with the help of the simplest disk and microlensing models. Of the models considered the best results are obtained with the disks around 10^7 M_odot black holes with inner edges at approx 10 gravitational radii.

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