The multiple quasar Q2237+0305 under a microlensing caustic

@article{Anguita2008TheMQ,
  title={The multiple quasar Q2237+0305 under a microlensing caustic},
  author={Timo Anguita and Robert W. Schmidt and Edwin Lewis Turner and Joachim Wambsganss and R. L. Webster and Karen Loomis and Daniel C. Long and R. McMillan ARIZentrum fuer Astronomie and University of Heidelberg and Princeton University. and University of Melbourne and Apache Point Observatory},
  journal={Astronomy and Astrophysics},
  year={2008},
  volume={480},
  pages={327-334}
}
We use the high magnification event seen in the 1999 OGLE campaign light curve of image C of the quadruply imaged gravitational lens Q2237+0305 to study the structure of the quasar engine. We have obtained g' - and r' -band photometry at the Apache Point Observatory 3.5 m telescope where we find that the event has a smaller amplitude in the r' -band than in the  g' - and OGLE V -bands. By comparing the light curves with microlensing simulations we obtain constraints on the sizes of the quasar… 

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