Microlensing in the double quasar SBS 1520+530

Free access article

Issue		A&A Volume 440, Number 1, September II 2005


Page(s)		53 - 58
Section		Cosmology (including clusters of galaxies)
DOI		http://dx.doi.org/10.1051/0004-6361:20052852

A&A 440, 53-58 (2005)
DOI: 10.1051/0004-6361:20052852

Microlensing in the double quasar SBS 1520+530

E. R. Gaynullina¹, R. W. Schmidt², T. Akhunov^{1, 3}, O. Burkhonov³, S. Gottlöber⁴, K. Mirtadjieva^{1, 3}, S. N. Nuritdinov^{1, 3}, I. Tadjibaev^{1, 3}, J. Wambsganss² and L. Wisotzki⁴

¹ 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: rschmidt@ari.uni-heidelberg.de
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

(Received 9 February 2005 / Accepted 13 May 2005)

Abstract
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 $\Delta m\approx 0.1$ 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 $\Delta t=(130\pm3)$ 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 $(0.14\pm0.03)$ 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

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