Source Size Measurement from Observed Quasar Microlensing
Abstract
Recently, the OGLE team have reported a clear quasar microlensing signal in Q2237 +0305. I have analyzed the microlens event of `image C' by using their finely and densely sampled light curves. From light curve fitting, I unambiguously set the source size of <=0.98 Einstein-Ring radius as a conservative limit. This limit corresponds to 2000 AU, if I adopt Mlens ~ 0.1Msolar 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.
- Publication:
-
Publications of the Astronomical Society of Australia
- Pub Date:
- 2001
- DOI:
- 10.1071/AS01014
- Bibcode:
- 2001PASA...18..211Y
- Keywords:
-
- accretion;
- accretion disks;
- galaxies: active;
- gravitational lensing;
- quasars: individual (Q2237+0305)