MiNDSTEp differential photometry of the gravitationally lensed quasars WFI 2033-4723 and HE 0047-1756: microlensing and a new time delay
Journal
Date Issued
2017
Author(s)
Giannini, E.
•
Schmidt, R. W.
•
Wambsganss, J.
•
Alsubai, K.
•
Andersen, J. M.
•
Anguita, T.
•
Bozza, V.
•
Bramich, D. M.
•
Browne, P.
•
Calchi Novati, S.
•
Damerdji, Y.
•
Diehl, C.
•
Dodds, P.
•
Dominik, M.
•
Elyiv, A.
•
Fang, X.
•
Figuera Jaimes, R.
•
Finet, F.
•
Gerner, T.
•
Gu, S.
•
Hardis, S.
•
Harpsøe, K.
•
Hinse, T. C.
•
Hornstrup, A.
•
Hundertmark, M.
•
Jessen-Hansen, J.
•
Jørgensen, U. G.
•
Juncher, D.
•
Kains, N.
•
Kerins, E.
•
Korhonen, H.
•
Liebig, C.
•
Lund, M. N.
•
Lundkvist, M. S.
•
Maier, G.
•
Mancini, L.
•
Masi, G.
•
Mathiasen, M.
•
Penny, M.
•
Proft, S.
•
Rabus, M.
•
Rahvar, S.
•
•
Scarpetta, G.
•
Sahu, K.
•
Schäfer, S.
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Schönebeck, F.
•
Skottfelt, J.
•
Snodgrass, C.
•
Southworth, J.
•
Surdej, J.
•
Tregloan-Reed, J.
•
Vilela, C.
•
Wertz, O.
•
Zimmer, F.
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 ∆t = (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. Based on data collected by MiNDSTEp with the Danish 1.54 m telescope at the ESO La Silla observatory.
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 ∆t = (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. Based on data collected by MiNDSTEp with the Danish 1.54 m telescope at the ESO La Silla observatory.
Volume
597
Start page
A49
Issn Identifier
0004-6361
Ads BibCode
2017A&A...597A..49G
Rights
open.access
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