DETECTION OF CHROMATIC MICROLENSING IN Q 2237 + 0305 A

@article{Mosquera2009DETECTIONOC,
  title={DETECTION OF CHROMATIC MICROLENSING IN Q 2237 + 0305 A},
  author={Ana M. Mosquera and Jose A. Mu{\~n}oz and Evencio Mediavilla},
  journal={The Astrophysical Journal},
  year={2009},
  volume={691},
  pages={1292-1299}
}
We present narrowband images of the gravitational lens system Q 2237 + 0305 made with the Nordic Optical Telescope in eight different filters covering the wavelength interval 3510-8130 A. Using point-spread function photometry fitting we have derived the difference in magnitude versus wavelength between the four images of Q 2237 + 0305. At λ = 4110 A, the wavelength range covered by the Stromgren-v filter coincides with the position and width of the C IV emission line. This allows us to… 

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