Journal article · Preprint article
Flux and color variations of the quadruply imaged quasar HE 0435-1223
University of Liege1
IT-Department, National Space Institute, Technical University of Denmark2
National Space Institute, Technical University of Denmark3
Heidelberg University 4
Università degli Studi del Sannio5
Centre for Backyard Astrophysics6
Sharif University of Technology7
National Institute for Nuclear Physics8
European Southern Observatory9
Keele University10
Max Planck Institute11
University of Salerno12
University of St Andrews13
University of Stuttgart14
The International Institute for Advanced Scientific Studies15
Georg-August-Universität Göttingen16
Aarhus University17
University of Copenhagen18
...and 8 moreAims: We present VRi photometric observations of the quadruply imaged quasarHE0435-1223, carried out with the Danish 1.54 m telescope at the La Silla Observatory. Our aim was to monitor and study the magnitudes and colors of each lensed component as a function of time. Methods. We monitored the object during two seasons (2008 and 2009) in the VRi spectral bands, and reduced the data with two independent techniques: difference imaging and point spread function (PSF) fitting.
Results. Between these two seasons, our results show an evident decrease in flux by ≈ 0.2-0.4 magnitudes of the four lensed components in the three filters. We also found a significant increase (≈ 0.05-0.015) in their V - R and R - i color indices. Conclusions. These flux and color variations are very likely caused by intrinsic variations of the quasar between the observed epochs.
Microlensing effects probably also affect the brightest "A" lensed component. © ESO, 2011.
| Language: | English |
|---|---|
| Publisher: | EDP Sciences |
| Year: | 2011 |
| Pages: | A42 |
| ISSN: | 14320746 and 00046361 |
| Types: | Journal article and Preprint article |
| DOI: | 10.1051/0004-6361/201016188 |
| ORCIDs: | 0000-0002-8736-1639 , Hornstrup, Allan and 0000-0001-7303-914X |
