Flux and color variations of the doubly imaged quasar UM673
Abstract
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 multi-epoch and multi-band photometric observations with the Danish 1.54m telescope at the La Silla Observatory. The observations were carried out in the VRi spectral bands during four seasons (2008--2011). We reduced the data using the PSF (Point Spread Function) photometric technique as well as aperture photometry. 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.
Keywords
Cite
@article{arxiv.1302.0766,
title = {Flux and color variations of the doubly imaged quasar UM673},
author = {D. Ricci and A. Elyiv and F. Finet and O. Wertz and K. Alsubai and T. Anguita and V. Bozza and P. Browne and M. Burgdorf and S. Calchi Novati and P. Dodds and M. Dominik and S. Dreizler and T. Gerner and M. Glitrup and F. Grundahl and S. Hardis and K. Harpsøe and T. C. Hinse and A. Hornstrup and M. Hundertmark and U. G. Jørgensen and N. Kains and E. Kerins and C. Liebig and G. Maier and L. Mancini and G. Masi and M. Mathiasen and M. Penny and S. Proft and S. Rahvar and G. Scarpetta and K. Sahu and S. Schäfer and F. Schönebeck and R. Schmidt and J. Skottfelt and C. Snodgrass and J. Southworth and C. C. Thöne and J. Wambsganss and F. Zimmer and M. Zub and J. Surdej},
journal= {arXiv preprint arXiv:1302.0766},
year = {2013}
}
Comments
7 pages, 8 figures, 4 tables