Astronomy and Astrophysics – Astrophysics
Scientific paper
1999-04-23
Astronomy and Astrophysics
Astrophysics
8 pages (including 4 figures and table), latex, emulateapj, submitted to ApJ, revised version - minor changes
Scientific paper
10.1086/308258
We present results from 2 years of monitoring of Huchra's lens (QSO 2237+0305) with the 1.3 m Warsaw telescope on Las Campanas, Chile. Photometry in the V band was done using a newly developed method for image subtraction. Reliable subtraction without Fourier division removes all complexities associated with the presence of a bright lensing galaxy. With positions of lensed images adopted from HST measurements it is relatively easy to fit the variable part of the flux in this system, as opposed to modeling of the underlying galaxy. For the first time we observed smooth light variation over a period of a few months, which can be naturally attributed to microlensing. We also describe automated software capable of real time analysis of the images of QSO 2237+0305. It is expected that starting from the next observing season in 1999 an alert system will be implemented for high amplification events (HAE) in this object. Time sampling and photometric accuracy achieved should be sufficient for early detection of caustic crossings.
Alard Ch.
Kubiak Mateo M. M.
Pietrzynski Grzegorz
Szymanski Michal
Udalski Andrzej
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