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

Research output: Contribution to journalJournal articlepeer-review

  • E. Giannini
  • R. W. Schmidt
  • J. Wambsganss
  • K. Alsubai
  • J. M. Andersen
  • T. Anguita
  • V. Bozza
  • D. M. Bramich
  • P. Browne
  • S. Calchi Novati
  • Y. Damerdji
  • C. Diehl
  • P. Dodds
  • M. Dominik
  • A. Elyiv
  • X. Fang
  • R. Figuera Jaimes
  • F. Finet
  • T. Gerner
  • S. Gu
  • S. Hardis
  • Kennet Bomann West Harpsøe
  • T. C. Hinse
  • A. Hornstrup
  • M. Hundertmark
  • J. Jessen-Hansen
  • Diana Juncher
  • N. Kains
  • E. Kerins
  • H. Korhonen
  • C. Liebig
  • Mikkel Nørup Lund
  • M. S. Lundkvist
  • G. Maier
  • L. Mancini
  • G. Masi
  • M. Mathiasen
  • M. Penny
  • S. Proft
  • M. Rabus
  • S. Rahvar
  • D. Ricci
  • G. Scarpetta
  • K. Sahu
  • S. Schäfer
  • F. Schönebeck
  • Jesper Mirsa Skottfelt
  • C. Snodgrass
  • J. Southworth
  • J. Surdej
  • J. Tregloan-Reed
  • C. Vilela
  • O. Wertz
  • F. Zimmer
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. Based on data collected by MiNDSTEp with the Danish 1.54 m telescope at the ESO La Silla observatory.
Original languageEnglish
Article numberA49
JournalAstronomy & Astrophysics
Volume597
ISSN0004-6361
DOIs
Publication statusPublished - 2017

    Research areas

  • gravitational lensing: micro, techniques: photometric, quasars: general

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