Astronomy and Astrophysics – Astrophysics
Scientific paper
Jun 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005a%26a...436..479m&link_type=abstract
Astronomy and Astrophysics, Volume 436, Issue 2, June III 2005, pp.479-492
Astronomy and Astrophysics
Astrophysics
5
Gravitational Lensing, Quasars: Individual: Q2237+0305, Techniques: Photometric, Techniques: Image Processing
Scientific paper
Using an optimal image subtraction technique, we have derived the V and R light curves of the four lensed QSO components of Q2237+0305 from the monitoring CCD frames obtained by the GLITP collaboration with the 2.6 m NOT telescope in 1999/2000 (Alcalde et al. 2002). We give here a detailed account of the data reduction and analysis and of the error estimates. In agreement with Woźniak et al. (2000a,b), the good derived photometric accuracy of the GLITP data allows to discuss the possible interpretation of the light curve of component A as due to a microlensing event taking place in the deflecting galaxy. This interpretation is strengthened by the colour dependence of the early rise of the light curve of component A, as it probably corresponds to a caustics crossing by the QSO source.
Lee Dong Won
Libbrecht C.
Moreau O.
Surdej Jean
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