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2 Acta Astronomica

2 2006

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The Optical Gravitational Lensing Experiment. OGLE-III Long Term Monitoring of the Gravitational Lens QSO 2237+0305

Udalski A., Szymański M. K., Kubiak M., Pietrzyński G., Soszyński I., Żebruń K., Szewczyk O., Wyrzykowski Ł., Ulaczyk K., Więckowski T.

Acta Astronomica

2006

Vol. 56, No. 4

293--305

We present results of the long term monitoring of the gravitational lens QSO 2237+0305 conducted during the OGLE survey. Light curves of all four components of the lens obtained during the second phase of the OGLE project (OGLE-II; 1997-2000) are supplemented with the data collected in the OGLE-III phase in the observing seasons 2001-2006. Calibration procedures to tie the new OGLE-III data with already calibrated OGLE-II light curves are described. The resulting homogeneous OGLE data set is the most extensive photometric coverage of the gravitational lens QSO 2237+0305, spanning now one decade - the seasons from 1997 to 2006 - and revealing unique microlensing activity of this spectacular object. All photometric data of the gravitational lens QSO 2237+0305 collected by OGLE are available to the astronomical community from the OGLE Internet} archive.

Microlensing of Q2237+0305: Simulations and Statistics

Jaroszyński M., Skowron J.

Acta Astronomica

2006

Vol. 56, No. 2

171--182

Using Monte Carlo simulations we produce several microlensing amplification maps for each of the four images of the quasar QSO 2237+0305. With FFT algorithms we convolve the maps with the filters representing sources of different sizes and surface brightness distributions. The cuts of the convolved maps represent fragments of synthetic light curves for corresponding sources. Since FFT method is not time consuming we can examine large number of cases and obtain several statistical characteristics of image variability. A simple test involving the measured amplitude of the apparent QSO variability during ≈5 years of OGLE III observations gives an estimate of the relative source velocity, 4000±2000 km/s.