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QSO 2237+0305 VR light curves from Gravitational Lenses International Time Project optical monitoring

  • We present VR observations of QSO 2237+0305 conducted by the Gravitational Lensing International Time Project collaboration from 1999 October 1 to 2000 February 3. The observations were made with the 2.56 m Nordic Optical Telescope at Roque de los Muchachos Observatory, La Palma (Spain). The point-spread function (PSF) fitting method and an adapted version of the ISIS subtraction method have been used to derive the VR light curves of the four components (A-D) of the quasar. The mean errors range in the intervals 0.01-0.04 mag (PSF fitting) and 0.01-0.02 mag (ISIS subtraction), with the faintest component (D) having the largest uncertainties. We address the relatively good agreement between the A and D light curves derived using different filters, photometric techniques, and telescopes. The new VR light curves of component A extend the time coverage of a high-magnification microlensing peak, which was discovered by the OGLE team.

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Author:D. Alcalde, E. Mediavilla, O. Moreau, Y. De Rop, R. Barrena, Rodrigo Gil-Merino, B. A. McLeod, V. Motta, Alejandro Oscoz, M. Serra-Ricart
Document Type:Article
Year of first Publication:2002
Year of Completion:2002
Release Date:2017/03/24
Source:The Astrophysical Journal. - 572 (2002), S. 729 - 734
Organizational units:Mathematisch-Naturwissenschaftliche Fakultät / Institut für Physik und Astronomie
Institution name at the time of publication:Mathematisch-Naturwissenschaftliche Fakultät / Institut für Physik