H0Licow – X. Spectroscopic/imaging survey and galaxy-group identification around the strong gravitational lens system WFI 2033−4723

Sluse, D and Rusu, C E and Desai, Shantanu and et al, . (2019) H0Licow – X. Spectroscopic/imaging survey and galaxy-group identification around the strong gravitational lens system WFI 2033−4723. Monthly Notices of the Royal Astronomical Society, 490. pp. 613-633. ISSN 0035-8711

Full text not available from this repository. (Request a copy)

Abstract

Galaxies and galaxy groups located along the line of sight towards gravitationally lensed quasars produce high-order perturbations of the gravitational potential at the lens position. When these perturbation are too large, they can induce a systematic error on H0 of a few per cent if the lens system is used for cosmological inference and the perturbers are not explicitly accounted for in the lens model. In this work, we present a detailed characterization of the environment of the lens system WFI 2033−4723 (zsrc = 1.662, zlens = 0.6575), one of the core targets of the H0LiCOW project for which we present cosmological inferences in a companion paper. We use the Gemini and ESO-Very Large telescopes to measure the spectroscopic redshifts of the brightest galaxies towards the lens, and use the ESO-MUSE integral field spectrograph to measure the velocity-dispersion of the lens (σlos = 250+−1521 km s−1) and of several nearby galaxies. In addition, we measure photometric redshifts and stellar masses of all galaxies down to i < 23 mag, mainly based on Dark Energy Survey imaging (DR1). Our new catalogue, complemented with literature data, more than doubles the number of known galaxy spectroscopic redshifts in the direct vicinity of the lens, expanding to 116 (64) the number of spectroscopic redshifts for galaxies separated by less than 3 arcmin (2 arcmin) from the lens. Using the flexion-shift as a measure of the amplitude of the gravitational perturbation, we identify two galaxy groups and three galaxies that require specific attention in the lens models. The ESO MUSE data enable us to measure the velocity-dispersions of three of these galaxies. These results are essential for the cosmological inference analysis presented in Rusu et al.

[error in script]
IITH Creators:
IITH CreatorsORCiD
Desai, Shantanuhttp://orcid.org/0000-0002-0466-3288
Item Type: Article
Uncontrolled Keywords: Galaxies, groups, general, Gravitational lensing, strong, Quasars individual, WFI 2033−4723, Indexed in Scopus and WoS
Subjects: Physics
Divisions: Department of Physics
Depositing User: Team Library
Date Deposited: 02 Dec 2019 06:57
Last Modified: 02 Dec 2019 06:57
URI: http://raiith.iith.ac.in/id/eprint/7082
Publisher URL: http://doi.org/10.1093/mnras/stz2483
Related URLs:

Actions (login required)

View Item View Item
Statistics for RAIITH ePrint 7082 Statistics for this ePrint Item