Abstract
The monitoring of the gravitational lens Q2237+0305 carried out by the OGLE group during 1997–2000 is analyzed. The significant light amplifications in the C and A quasar components with maxima in mid-and late 1999, respectively, are interpreted as the crossing of microlens caustics by the source. A constraint on the emitting-region size R≤1015 cm has been obtained from the light-curve shape by assuming a power-law quasar brightness distribution (r 2+R 2)−p. To estimate the exponent p∼1.2 requires refining the standard model for the quasar continuum formation in an optically thick accretion disk with p=1.5.
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Translated from Pis’ma v Astronomicheski\(\overset{\lower0.5em\hbox{$\smash{\scriptscriptstyle\smile}$}}{l} \) Zhurnal, Vol. 27, No. 3, 2001, pp. 180–186.
Original Russian Text Copyright © 2001 by Shalyapin.
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Shalyapin, V.N. Caustic crossing in the gravitational lens Q2237+0305. Astron. Lett. 27, 150–155 (2001). https://doi.org/10.1134/1.1351558
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DOI: https://doi.org/10.1134/1.1351558