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Title: H0LiCOWXI. Spectroscopic/imaging survey and galaxy-group identification around the strong gravitational lens system WFI 2033-4723

Abstract

Galaxies and galaxy groups located towards gravitationally lensed quasars produce high order perturbation of the gravitational potential at the lens position. When this perturbation is too large, it can induce a systematic error on H0 of a few percents if the lens system is used for cosmological inference, and the perturber 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, one of the core targets of the H0LiCOW project for which we present cosmological inference in a companion paper (Rusu et al.). We use the Gemini and ESO-Very Large telescopes to measure the spectroscopic redshift of the brightest galaxies towards the lens, and use the ESO-MUSE integral field spectrograph to measure the velocity dispersion of the lens (v_los = 250.5+15.3+-21.3 km/s), and of several nearby galaxies. In addition, we measure photo-z and stellar mass of all galaxies down to i < 23 mag, mainly based on Dark Energy Survey imaging. Our new catalog, 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 spec-z for galaxiesmore » separated by less than 30 (20) from the lens. Using the flexion-shift as a measure of the amplitude of the gravitational perturbation, we identify 2 galaxy groups and 4 galaxies that require specific attention in the lens models. The ESO MUSE data enable us to measure the velocity dispersion of three of these galaxies. Those results are instrumental to the cosmological inference analysis presented in Rusu et al.« less

Authors:
 [1]
  1. STAR Institute, Belgium
Publication Date:
Research Org.:
Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)
OSTI Identifier:
1556959
Report Number(s):
FERMILAB-PUB-19-168-AE
1747875
DOE Contract Number:  
AC02-07CH11359
Resource Type:
Journal Article
Journal Name:
TBD
Additional Journal Information:
Journal Name: TBD
Country of Publication:
United States
Language:
English
Subject:
79 ASTRONOMY AND ASTROPHYSICS

Citation Formats

Sluse, D. H0LiCOWXI. Spectroscopic/imaging survey and galaxy-group identification around the strong gravitational lens system WFI 2033-4723. United States: N. p., 2019. Web.
Sluse, D. H0LiCOWXI. Spectroscopic/imaging survey and galaxy-group identification around the strong gravitational lens system WFI 2033-4723. United States.
Sluse, D. Thu . "H0LiCOWXI. Spectroscopic/imaging survey and galaxy-group identification around the strong gravitational lens system WFI 2033-4723". United States. https://www.osti.gov/servlets/purl/1556959.
@article{osti_1556959,
title = {H0LiCOWXI. Spectroscopic/imaging survey and galaxy-group identification around the strong gravitational lens system WFI 2033-4723},
author = {Sluse, D.},
abstractNote = {Galaxies and galaxy groups located towards gravitationally lensed quasars produce high order perturbation of the gravitational potential at the lens position. When this perturbation is too large, it can induce a systematic error on H0 of a few percents if the lens system is used for cosmological inference, and the perturber 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, one of the core targets of the H0LiCOW project for which we present cosmological inference in a companion paper (Rusu et al.). We use the Gemini and ESO-Very Large telescopes to measure the spectroscopic redshift of the brightest galaxies towards the lens, and use the ESO-MUSE integral field spectrograph to measure the velocity dispersion of the lens (v_los = 250.5+15.3+-21.3 km/s), and of several nearby galaxies. In addition, we measure photo-z and stellar mass of all galaxies down to i < 23 mag, mainly based on Dark Energy Survey imaging. Our new catalog, 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 spec-z for galaxies separated by less than 30 (20) from the lens. Using the flexion-shift as a measure of the amplitude of the gravitational perturbation, we identify 2 galaxy groups and 4 galaxies that require specific attention in the lens models. The ESO MUSE data enable us to measure the velocity dispersion of three of these galaxies. Those results are instrumental to the cosmological inference analysis presented in Rusu et al.},
doi = {},
journal = {TBD},
number = ,
volume = ,
place = {United States},
year = {2019},
month = {5}
}