Abstract
Understanding QSO accretion is both at the frontier of new physics, and essential in understanding the driving force behind the great power of QSOs and their energetic feedback onto their galactic environments. However, the accretion disks are at micro-to-nano arcsecond scales, unresolvable from Earth. Gravitational microlensing of QSOs provides statistical information on the microarcsecond structure of the lensed QSO. By measuring the flux ratio in two of the lensed images and comparing to a lens models for the intervening galaxy, I intend to establish upper limits on the size of the emission region.
