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., Novati, S. Calchi, Dodds, P., Dominik, M., Dreizler, S., Gerner, T., Glitrup, M., Grundahl, F., Hardis, S., Harpsoe, K., Hinse, T. C., Hornstrup, A., Hundertmark, M., Jorgensen, 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., Schaefer, S., Schoenebeck, F., Schmidt, R., Skottfelt, J., Snodgrass, C., Southworth, J., Thoene, C. C., Wambsganss, J., Zimmer, F., Zub, M. and Surdej, J. (2013) Flux and color variations of the doubly imaged quasar UM673. Astronomy and Astrophysics, 551 1-7. doi:10.1051/0004-6361/201118755

Author Ricci, D.
Elyiv, A.
Finet, F.
Wertz, O.
Alsubai, K.
Anguita, T.
Bozza, V.
Browne, P.
Burgdorf, M.
Novati, S. Calchi
Dodds, P.
Dominik, M.
Dreizler, S.
Gerner, T.
Glitrup, M.
Grundahl, F.
Hardis, S.
Harpsoe, K.
Hinse, T. C.
Hornstrup, A.
Hundertmark, M.
Jorgensen, 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.
Schaefer, S.
Schoenebeck, F.
Schmidt, R.
Skottfelt, J.
Snodgrass, C.
Southworth, J.
Thoene, C. C.
Wambsganss, J.
Zimmer, F.
Zub, M.
Surdej, J.
Title Flux and color variations of the doubly imaged quasar UM673
Journal name Astronomy and Astrophysics   Check publisher's open access policy
ISSN 0004-6361
Publication date 2013-03
Sub-type Article (original research)
DOI 10.1051/0004-6361/201118755
Open Access Status DOI
Volume 551
Start page 1
End page 7
Total pages 7
Place of publication Les Ulis, France
Publisher E D P Sciences
Language eng
Formatted 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.
Keyword Gravitational lensing: strong
Quasars: general
Techniques: photometric
Quasars: individual: UM673
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Non-UQ

Document type: Journal Article
Sub-type: Article (original research)
Collection: School of Mathematics and Physics
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