Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994a%26a...291..731j&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 291, no. 3, p. 731-736
Astronomy and Astrophysics
Astrophysics
5
Accretion Disks, Active Galactic Nuclei, Gravitational Lenses, Optical Thickness, Plasma Clouds, Quasars, Emission Spectra, Light Curve, Luminosity, Relativity, Variability
Scientific paper
We consrtruct models of active galactic nuclei consisting of an accretion disk and a region filled with optically thin cloudlets reprocessing a part of X-ray radiation into lower frequencies. We fit our model parameters to Q2237+0305 -a rapidly variable quasar, whose luminosity changes are attributed to microlensing. We simulate the microlensing light curves for our model and compare the rate of luminosity changes with the observations. We also compare the results with the results obtained for other accretion disks models of the source. Out two-component model of the source is better than the examined models in reproducing simultaneously the rapid variability and the spectrum of the source, but the difference is not dramatic. Our model is not ruled out by the observations of Q2237+0305 summarized by Racine (1992). If the observations of Pen et al. (1994) are confirmed, all the source models including accretion disks are in trouble.
Jaroszynski Michal
Marck Jean-Alain
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