Title: COSMOGRAIL: the COSmological MOnitoring of GRAvItational Lenses: XII. Time delays of the doubly lensed quasars SDSS J1206+4332 and HS 2209+1914
Authors: Eulaers, E. ×
Tewes, M.
Magain, P.
Courbin, F.
Asfandiyarov, I.
Ehgamberdiev, Sh.
Rathna Kumar, S.
Stalin, C.S.
Prabhu, T.P.
Meylan, G.
Van Winckel, Hans #
Issue Date: May-2013
Publisher: EDP Sciences
Series Title: Astronomy & Astrophysics vol:553 pages:9
Article number: A121
Abstract: 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.

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 ( or via and at
ISSN: 0004-6361
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Institute of Astronomy
× corresponding author
# (joint) last author

Files in This Item:
File Description Status SizeFormat
1304.4474v1.pdf Published 2290KbAdobe PDFView/Open


All items in Lirias are protected by copyright, with all rights reserved.

© Web of science