Chromatic Microlensing Time Delays
  Due to the finite size of the disk and the temperature fluctuations producing
the variability, microlensing changes the actual time delays between images of
strongly lensed AGN on the $\sim$day(s) light-crossing time scale of the
emission region. This microlensing-induced time delay depends on the disk
model, primarily the disk size $R_\mathrm{disk}$ which has been found to be
larger than predicted by the thin-disk model. In this work, we propose that
light curves measured in different bands will give different time delays since
$R_\mathrm{disk}$ is a function of wavelength, and by measuring the time delay
differences between bands, one can 1) directly verify such an new effect; 2)
test the thin-disk model of quasars. For the second goal, our method can avoid
the potential inconsistency between multi-band light curves that may bias the
results by continuum reverberation mapping. We conduct a simulation based on a
PG 1115+080-like lensed quasar, calculating the theoretical distributions of
time delay differences between two bands: u and i centered around 354nm and
780nm, under and beyond the thin-disk model, respectively. Assuming the disk
size is twice larger than the standard one, we find that with a precision of 2
days in the time delay difference measurements, the microlensing time delay
effect can be verified with $\sim4$ measurements while with $\sim35$
measurements the standard model can be excluded. This approach could be
realized in the ongoing and upcoming multi-band wide-field surveys with
follow-up observations.
