Giannini, E, Schmidt, RW, Wambsganss, J, Alsubai, K, Andersen, JM, Anguita, T, Bozza, V, Bramich, DM, Browne, P, Novati, SC, Damerdji, Y, Diehl, C, Dodds, P, Dominik, M, Elyiv, A, Fang, X, Jaimes, RF, Finet, F, Gerner, T, Gu, S, Hardis, S, Harpsoe, K, Hinse, TC, Hornstrup, A, Hundertmark, M, Jessen-Hansen, J, Jorgensen, UG, Juncher, D, Kains, N, Kerins, E, Korhonen, H, Liebig, C, Lund, MN, Lundkvist, MS, Maier, G, Mancini, L, Masi, G, Mathiasen, M, Penny, M, Proft, S, Rabus, M, Rahvar, S, Ricci, D, Scarpetta, G, Sahu, K, Schaefer, S, Schoenebeck, F, Skottfelt, J, Snodgrass, C, Southworth, J, Surdej, J, Tregloan-Reed, J, Vilela, C, Wertz, O and Zimmer, F (2017) MiNDSTEp differential photometry of the gravitationally lensed quasars WFI 2033-4723 and HE0047-1756: microlensing and a new time delay. Astronomy & Astrophysics, 597.

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Abstract

Aims
We present V and R photometry of the gravitationally lensed quasars WFI 2033-4723 and HE 0047-1756. The data were taken by the MiNDSTEp collaboration with the 1.54 m Danish telescope at the ESO La Silla observatory from 2008 to 2012.

Methods
Differential photometry has been carried out using the image subtraction method as implemented in the HOTPAnTS package, additionally using GALFIT for quasar photometry.

Results
The quasar WFI 2033-4723 showed brightness variations of order 0.5 mag in V and R during the campaign. The two lensed components of quasar HE 0047-1756 varied by 0.2–0.3 mag within five years. We provide, for the first time, an estimate of the time delay of component B with respect to A of Δt = (7.6 ± 1.8) days for this object. We also find evidence for a secular evolution of the magnitude difference between components A and B in both filters, which we explain as due to a long-duration microlensing event. Finally we find that both quasars WFI 2033-4723 and HE 0047-1756 become bluer when brighter, which is consistent with previous studies.

Item Type: Article
Additional Information: © 2016 EDP Sciences. This is the final published version of the article (version of record). It first appeared online via EDP Sciences at https://doi.org/10.1051/0004-6361/201527422 - please refer to any applicable terms of use of the publisher.
Uncontrolled Keywords: gravitational lensing, micro, techniques, photometric, quasars, genera
Subjects: Q Science > QB Astronomy > QB460 Astrophysics
Divisions: Faculty of Natural Sciences > School of Chemical and Physical Sciences
Related URLs:
Depositing User: Symplectic
Date Deposited: 04 Apr 2017 09:15
Last Modified: 03 Apr 2019 09:16
URI: http://eprints.keele.ac.uk/id/eprint/3145

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