Volume 440, Number 1, September II 2005
|Page(s)||53 - 58|
|Section||Cosmology (including clusters of galaxies)|
|Published online||19 August 2005|
Microlensing in the double quasar SBS 1520+530
National University of Uzbekistan, Physics Faculty, Tashkent 700174, Uzbekistan
2 Astronomisches Rechen-Institut, Zentrum für Astronomie der Universität Heidelberg, Mönchhofstraße 12-14, 69120 Heidelberg, Germany e-mail: email@example.com
3 Ulugh Beg Astronomical Institute of the Uzbek Academy of Sciences and Isaac Newton Institute of Chile, Uzbek Branch, Astronomicheskaya 33, Tashkent 700052, Uzbekistan
4 Astrophysikalisches Institut Potsdam, An der Sternwarte 16, 14482 Potsdam, Germany
Accepted: 13 May 2005
We present the results of a monitoring campaign of the double quasar SBS 1520+530 at Maidanak observatory from April 2003 to August 2004. We obtained light curves in V and R filters that show small-amplitude mag intrinsic variations of the quasar on time scales of about 100 days. The data set is consistent with the previously determined time delay of days by Burud et al. (2002, A&A, 391, 481). We find that the time delay corrected magnitude difference between the quasar images is now larger by mag than during the observations by Burud et al. (2002). This confirms the presence of gravitational microlensing variations in this system.
Key words: gravitational lensing / dark matter / quasars: individual: SBS 1520+530 / cosmology: observations
© ESO, 2005
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