Flux and color variations of the doubly imaged quasar UM673

D. Ricci, A. Elyiv, F. Finet, O. Wertz, K. Alsubai, T. Anguita, V. Bozza, P. Browne, M. Burgdorf, S. Calchi Novati, P. Dodds, M. Dominik, S. Dreizler, T. Gerner, M. Glitrup, F. Grundahl, S. Hardis, K. Harpsøe, T.C. Hinse, Allan HornstrupM. Hundertmark, U.G. Jørgensen, N. Kains, E. Kerins, C. Liebig, G. Maier, L. Mancini, G. Masi, M. Mathiasen, M. Penny, S. Proft, S. Rahvar, G. Scarpetta, K. Sahu, S. Schäfer, F. Schönebeck, R. Schmidt, J. Skottfelt, C. Snodgrass, J. Southworth, C.C. Thöne, J. Wambsganss, F. Zimmer, M. Zub, J. Surdej

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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. © ESO, 2013.
Original languageEnglish
Article numberA104
JournalAstronomy & Astrophysics
Volume551
Number of pages7
ISSN0004-6361
DOIs
Publication statusPublished - 2013

Keywords

  • Color
  • Galaxies
  • Optical transfer function
  • Photometry

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