Volume 566, June 2014
|Number of page(s)||10|
|Published online||04 June 2014|
Department of PhysicsNational Taiwan University,
No.1, Sec. 4, Roosevelt Rd.,
e-mail: firstname.lastname@example.org; email@example.com
2 Graduate Institute of Astronomy, National Central University, Jhongli City, Taoyuan County 320, Taiwan
3 Sternberg Astronomical Institute (SAI), Moscow M.V. Lomonosov State University, Universitetskii pr. 13, 119992 Moscow, Russia
Accepted: 1 April 2014
Methods. High-resolution adaptive optics images of UM673 taken with the Subaru telescope in the H band were examined. We also analysed the J, H and K-band observational data of UM673 obtained with the 1.3 m telescope at the CTIO observatory.
Results. We present photometry of quasar components A and B of UM673, the lens, and the nearby bright galaxy using H-band observational data obtained with the Subaru telescope. Based on the CTIO observations of UM673, we also present J- and H-band photometry and estimates of the J, H and K-band flux ratios between the two UM673 components in recent epochs. The near-infrared fluxes of the A and B components of UM673 and their published optical fluxes are analysed to measure extinction properties of the lensing galaxy. We estimate the extinction-corrected flux ratio between components A and B to be about 2.14 mag. We discuss lens models for the UM673 system constrained with the positions of the UM673 components, their flux ratio, and the previously measured time delay.
Key words: gravitational lensing: strong / methods: data analysis / quasars: individual: UM673
Based in part on data collected at Subaru Telescope, which is operated by the National Astronomical Observatory of Japan.
The final reduced Subaru images presented in Figs. 1 and 2 are only available at the CDS via anonymous ftp to cdsarc.u-strasbg.fr (18.104.22.168) or via http://cdsarc.u-strasbg.fr/viz-bin/qcat?J/A+A/566/A36
© ESO, 2014
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