COSMOGRAIL. XVIII. time delays of the quadruply lensed quasar WFI2033-4723
Abstract
We present new measurements of the time delays of WFI2033-4723. The data sets used in this work include 14 years of data taken at the 1.2 m Leonhard Euler Swiss telescope, 13 years of data from the SMARTS 1.3 m telescope at Las Campanas Observatory and a single year of high-cadence and high-precision monitoring at the MPIA 2.2 m telescope. The time delays measured from these different data sets, all taken in the R-band, are in good agreement with each other and with previous measurements from the literature. Combining all the time-delay estimates from our data sets results in ΔtAB = 36.2+0.7-0.8 days (2.1% precision), ΔtAC = -23.3+1.2-1.4 days (5.6%) and ΔtBC = -59.4+1.3-1.3 days (2.2%). In addition, the close image pair A1-A2 of the lensed quasars can be resolved in the MPIA 2.2 m data. We measure a time delay consistent with zero in this pair of images. We also explore the prior distributions of microlensing time-delay potentially affecting the cosmological time-delay measurements of WFI2033-4723. Our time-delay measurements are not precise enough to conclude that microlensing time delay is present or absent from the data. This work is part of a H0LiCOW series focusing on measuring the Hubble constant from WFI2033-4723.
Full light curves of the four data sets are only available at the CDS via anonymous ftp to http://cdsarc.u-strasbg.fr (ftp://130.79.128.5) or via http://cdsarc.u-strasbg.fr/viz-bin/cat/J/A+A/629/A97- Publication:
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Astronomy and Astrophysics
- Pub Date:
- September 2019
- DOI:
- arXiv:
- arXiv:1905.08260
- Bibcode:
- 2019A&A...629A..97B
- Keywords:
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- gravitational lensing: strong;
- galaxies: individual: WFI2033-4723;
- cosmological parameters;
- Astrophysics - Cosmology and Nongalactic Astrophysics
- E-Print:
- Submitted to Astronomy and Astrophysics