SIMBAD references

Recently, the OGLE team has reported a clear quasar microlensing signal in Q2237+0305. We have analyzed the microlensing event of ``image C'' by using their finely sampled light curves. From the light-curve fitting, we can unambiguously set the source size of ≲0.98 Einstein ring radius as a conservative limit. This limit corresponds to 2000 AU, if we adopt the M_lens∼0.1 M_☉ value obtained by a recent statistical study of the mean mass of the lens object. This is clear evidence for the existence of an accretion disk in the central region of the quasar.