3 citations · 4 across the 2 of their papers we have counts for
2 papers
astro-ph.GA2025★ 1 cited
Detection of colour variations from gravitational microlensing observations in the quadruple quasar HE0435-1223: Implications for the accretion disk
Christian Sorgenfrei, Robert W. Schmidt, Joachim Wambsganss
We present monitoring observations of quasar microlensing in the quadruple quasar HE0435-1223. The microlensing-induced light curves of the quasar images are chromatic, i.e. they d…
astro-ph.GA2024★ 3 cited
Improving the light curves of gravitationally lensed quasars with Gaia proper motion data
C. Sorgenfrei, R. W. Schmidt, J. Wambsganss
We show how to significantly improve difference image analysis (DIA) of gravitationally lensed quasars over long periods of time using Gaia proper motions. DIA requires the subtrac…