XII. Time delays of the doubly lensed quasars SDSS J1206+4332 and HS 2209+1914
1 Institut d’Astrophysique et de Géophysique, Université de Liège, 17 Allée du 6 Août, Sart Tilman (Bat. B5C), Liège 1, Belgium
2 Laboratoire d’Astrophysique, École Polytechnique Fédérale de Lausanne (EPFL), Observatoire de Sauverny, 1290 Versoix, Switzerland
3 Ulugh Beg Astronomical Institute, Uzbek Academy of Sciences, Astronomicheskaya 33, 100052 Tashkent, Uzbekistan
4 Instituut voor Sterrenkunde, Katholieke Universiteit Leuven, Celestijnenlaan 200B, 3001 Heverlee, Belgium
5 Indian Institute of Astrophysics, II Block, Koramangala, 560 034 Bangalore, India
Received: 21 January 2013
Accepted: 2 March 2013
Aims. Within the framework of the COSMOGRAIL collaboration we present 7- and 8.5-year-long light curves and time-delay estimates for two gravitationally lensed quasars: SDSS J1206+4332 and HS 2209+1914.
Methods. We monitored these doubly lensed quasars in the R-band using four telescopes: the Mercator, Maidanak, Himalayan Chandra, and Euler telescopes, together spanning a period of 7 to 8.5 observing seasons from mid-2004 to mid-2011. The photometry of the quasar images was obtained through simultaneous deconvolution of these data. The time delays were determined from these resulting light curves using four very different techniques: a dispersion method, a spline fit, a regression difference technique, and a numerical model fit. This minimizes the bias that might be introduced by the use of a single method.
Results. The time delay for SDSS J1206+4332 is ΔtAB = 111.3 ± 3 days with A leading B, confirming a previously published result within the error bars. For HS 2209+1914 we present a new time delay of ΔtBA = 20.0 ± 5 days with B leading A.
Conclusions. The combination of data from up to four telescopes have led to well-sampled and nearly 9-season-long light curves, which were necessary to obtain these results, especially for the compact doubly lensed quasar HS 2209+1914.
Key words: gravitational lensing: strong / cosmological parameters / quasars: individual: SDSS J1206+4332 / quasars: individual: HS 2209+1914
Based on observations made with the 1.2-m Swiss Euler telescope (La Silla, Chile), the 1.5-m AZT-22 telescope (Maidanak Observatory, Uzbekistan), the 2.0-m HCT telescope (Hanle, India), and the 1.2-m Mercator Telescope. Mercator is operated on the island of La Palma by the Flemish Community, at the Spanish Observatorio del Roque de los Muchachos of the Instituto de Astrofísica de Canarias.
Numerical values of light curves are only available at the CDS via anonymous ftp to cdsarc.u-strasbg.fr (22.214.171.124) or via http://cdsarc.u-strasbg.fr/viz-bin/qcat?J/A+A/553/A121 and at http://www.cosmograil.org
© ESO, 2013