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COSMOGRAIL: the COSmological MOnitoring of GRAvItational Lenses*,**, XII. Time delays of the doubly lensed quasars SDSS J1206+4332 and HS 2209+1914

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dc.contributor.author Eulaers, E
dc.contributor.author Tewes, M
dc.contributor.author Magain, P
dc.contributor.author Courbin, F
dc.contributor.author Asfandiyarov, I
dc.contributor.author Ehgamberdiev, S
dc.contributor.author Rathna Kumar, S
dc.contributor.author Stalin, C. S
dc.contributor.author Prabhu, T. P
dc.contributor.author Meylan, G
dc.contributor.author Van Winckel, H
dc.date.accessioned 2013-06-10T16:35:26Z
dc.date.available 2013-06-10T16:35:26Z
dc.date.issued 2013-05
dc.identifier.citation Astronomy & Astrophysics, Vol. 553, A121 en
dc.identifier.issn 1432-0746
dc.identifier.uri http://hdl.handle.net/2248/6077
dc.description Open Access en
dc.description * 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.
dc.description ** Numerical values of light curves are only available at the CDS via anonymous ftp to cdsarc.u-strasbg.fr ( or via http://cdsarc.u-strasbg.fr/viz-bin/qcat?J/A+A/553/A121 and at http://www.cosmograil.org
dc.description.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. en
dc.publisher EDP Sciences en
dc.relation.uri http://dx.doi.org/10.1051/0004-6361/201321140 en
dc.relation.uri http://arxiv.org/abs/1304.4474 en
dc.rights © ESO en
dc.subject Gravitational lensing: strong en
dc.subject Cosmological parameters en
dc.subject Quasars: Individual: SDSS J1206+4332 en
dc.subject Quasars: Individual: HS 2209+1914 en
dc.title COSMOGRAIL: the COSmological MOnitoring of GRAvItational Lenses*,**, XII. Time delays of the doubly lensed quasars SDSS J1206+4332 and HS 2209+1914 en
dc.type Article en

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