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Flux and color variations of the doubly imaged quasar UM673

Ricci, D.; Elyiv, A.; Finet, F.; Wertz, O.; Alsubai, K.; Anguita, T.; Bozza, V.; Browne, P.; Burgdorf, M.; Calchi Novati, S.; Dodds, P.; Dominik, M.; Dreizler, S.; Gerner, T.; Glitrup, M.; Grundahl, F.; Hardis, S.; Harpsøe, K.; Hinse, T. C.; Hornstrup, A.; Hundertmark, M.; Jørgensen, U. G.; Kains, N.; Kerins, E.; Liebig, C.; Maier, G.; Mancini, L.; Masi, G.; Mathiasen, M.; Penny, M.; Proft, S.; Rahvar, S.; Scarpetta, G.; Sahu, K.; Schäfer, S.; Schönebeck, F.; Schmidt, R.; Skottfelt, J.; Snodgrass, C.; Southworth, J.; Thöne, C. C.; Wambsganss, J.; Zimmer, F.; Zub, M. and Surdej, J. (2013). Flux and color variations of the doubly imaged quasar UM673. Astronomy & Astrophysics, 551, article no. A104.

DOI (Digital Object Identifier) Link: https://doi.org/10.1051/0004-6361/201118755
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Abstract

Aims. With the aim of characterizing the flux and color variations of the multiple components of the gravitationally lensed quasar UM673 as a function of time, we have performed multiepoch and multiband photometric observations with the Danish telescope at the La Silla Observatory.

Methods. The observations were carried out in the VRi spectral bands during four seasons (2008–2011). We reduced the data using the point spread function photometric technique as well as aperture photometry.

Results. Our results show for the brightest lensed component some significant decrease in flux between the first two seasons (+ 0.09/+ 0.11/+ 0.05 mag) and a subsequent increase during the following ones (− 0.11/− 0.11/− 0.10 mag) in the V/R/i spectral bands, respectively. Comparing our results with previous studies, we find smaller color variations between these seasons as compared with previous ones. We also separate the contribution of the lensing galaxy from that of the fainter and close lensed component.

Item Type: Journal Item
Copyright Holders: 2013 ESO
ISSN: 1432-0746
Extra Information: 7 pp.
Keywords: gravitational lensing; quasars; photometric techniques
Academic Unit/School: Faculty of Science, Technology, Engineering and Mathematics (STEM) > Physical Sciences
Faculty of Science, Technology, Engineering and Mathematics (STEM)
Research Group: Centre for Electronic Imaging (CEI)
Space
Item ID: 43051
Depositing User: Colin Snodgrass
Date Deposited: 26 May 2015 15:11
Last Modified: 07 Dec 2018 10:31
URI: http://oro.open.ac.uk/id/eprint/43051
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