Observations of the Lensed Quasar Q2237+0305 with CanariCam at GTC
H. Vives-Arias, J. A. Munoz, C. S. Kochanek, E. Mediavilla, J., Jimenez-Vicente

TL;DR
This study uses mid-IR observations of the lensed quasar Q2237+0305 to constrain the size and temperature profile of its accretion disk, and to investigate the presence of substructure in the lensing galaxy.
Contribution
First mid-IR measurements of Q2237+0305 are used to analyze the quasar's accretion disk structure and lens substructure, providing new constraints on disk size, temperature profile, and satellite fraction.
Findings
Half-light radius of the accretion disk is approximately 3.4 light-days.
Temperature profile exponent p is estimated at 0.79, close to the standard thin-disk model.
Estimated satellite surface density fraction near the images is around 1-3%.
Abstract
We present new mid-IR observations of the quadruply lensed quasar Q2237+0305 taken with CanariCam on the Gran Telescopio Canarias. Mid-IR emission by hot dust, unlike the optical and near-IR emission from the accretion disk, is unaffected by the interstellar medium (extinction/scattering) or stellar microlensing. We compare these "true" ratios to the (stellar) microlensed flux ratios observed in the optical/near-IR to constrain the structure of the quasar accretion disk. We find a half-light radius of light-days at {\AA}, and an exponent for the temperature profile of , where for a standard thin-disk model. If we assume that the differences in the mid-IR flux ratios measured over the years are due to microlensing variability, we find a lower limit…
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