MiNDSTEp differential photometry of the gravitationally lensed quasars WFI 2033-4723 and HE 0047-1756: Microlensing and a new time delay

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, Yassine; Diehl, C.; Dodds, P.; Dominik, M.; Elyiv, Andrii; 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.; Ricci, D.; Scarpetta, G.; Sahu, K.; Schäfer, S.; Schönebeck, F.; Skottfelt, J.; Snodgrass, C.; Southworth, J.; Surdej, Jean; Tregloan-Reed, J.; Vilela, C.; Wertz, O.; Zimmer, F.

doi:10.1051/0004-6361/201527422

Article (Scientific journals)

MiNDSTEp differential photometry of the gravitationally lensed quasars WFI 2033-4723 and HE 0047-1756: Microlensing and a new time delay

Giannini, E.; Schmidt, R. W.; Wambsganss, J. et al.

2017 • In Astronomy and Astrophysics, 597, p. 49

Peer Reviewed verified by ORBi

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https://hdl.handle.net/2268/220450

DOI
10.1051/0004-6361/201527422

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Keywords :

Gravitational lensing: Micro; Quasars: General; Techniques: Photometric; Galaxies; Photometry; Time delay; Timing circuits; Brightness variations; Differential photometry; Gravitational lensing: micros; Image subtraction; Long duration; Secular evolution; Astronomy

Abstract :

[en] 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. © ESO, 2016.

Disciplines :

Space science, astronomy & astrophysics

Author, co-author :

Giannini, E.; Astronomisches Rechen-Institut, Zentrum für Astronomie, Universität Heidelberg, Mönchhofstraße 12-14, Heidelberg, Germany

Schmidt, R. W.; Astronomisches Rechen-Institut, Zentrum für Astronomie, Universität Heidelberg, Mönchhofstraße 12-14, Heidelberg, Germany

Wambsganss, J.; Astronomisches Rechen-Institut, Zentrum für Astronomie, Universität Heidelberg, Mönchhofstraße 12-14, Heidelberg, Germany

Alsubai, K.; Qatar Environment and Energy Research Institute (QEERI), HBKU, Qatar Foundation, Doha, Qatar

Andersen, J. M.; Department of Astronomy, Boston University, 725 Commonwealth Avenue, Boston, MA, United States, Niels Bohr Institute and Centre for Star and Planet Formation, University of Copenhagen, Øster Voldgade 5, Copenhagen, Denmark

Anguita, T.; Departamento de Ciencias Físicas, Universidad Andres Bello, Avenida República 220, Santiago, Chile, Millennium Institute of Astrophysics, Chile

Bozza, V.; Dipartimento di Fisica E.R. Caianiello, Università di Salerno, via Giovanni Paolo II 132, Fisciano (SA), Italy, Istituto Nazionale di Fisica Nucleare, Sezione di Napoli, Napoli, Italy

Bramich, D. M.; Qatar Environment and Energy Research Institute (QEERI), HBKU, Qatar Foundation, Doha, Qatar

Browne, P.; SUPA, University of St.Andrews, School of Physics and Astronomy, North Haugh, St.Andrews, United Kingdom

Calchi Novati, S.; Dipartimento di Fisica E.R. Caianiello, Università di Salerno, via Giovanni Paolo II 132, Fisciano (SA), Italy, Istituto Internazionale per gli Alti Studi Scientifici (IIASS), Vietri Sul Mare (SA), Italy, NASA Exoplanet Science Institute, California Institute of Technology, MS 100-22, Pasadena, CA, United States

More authors (45 more)

Language :

English

Title :

MiNDSTEp differential photometry of the gravitationally lensed quasars WFI 2033-4723 and HE 0047-1756: Microlensing and a new time delay

Publication date :

2017

Journal title :

Astronomy and Astrophysics

ISSN :

0004-6361

eISSN :

1432-0746

Publisher :

EDP Sciences

Volume :

597

Pages :

A49

Peer reviewed :

Peer Reviewed verified by ORBi

Funders :

ST/L000768/1, STFC, Science and Technology Facilities Council

Available on ORBi :

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