
%0 Journal Article
%A Yonehara, Atsunori 
%T Source Size Measurement from Observed Quasar Microlensing
%J Publications of the Astronomical Society of Australia
%D 2001/09/28
%V 18
%N 2
%P 211-214
%K accretion, accretion disks &#8212; galaxies: active &#8212; gravitational lensing &#8212; quasars: individual (Q2237+0305)
%R https://doi.org/10.1071/AS01014
%U https://www.publish.csiro.au/paper/AS01014 
%X Received 2001 January 21, accepted 2001 May 5 Recently, the OGLE team have reported a clear quasar microlensing signal in Q2237+0305. I have analyzed the microlens event of &#8216;image C&#8217; by using their finely and densely sampled light curves. From light curve fitting, I unambiguously set the source size of &le;0.98 Einstein-Ring radius as a conservative limit. This limit corresponds to 2000 AU, if I adopt Mlens ~ 0.1M obtained by a recent statistical study of the mean mass of the lens object. This gives clear evidence for the existence of an accretion disk in the central region of the quasar. 
