CosmoFONDUE - Cosmological Fundamental Observables and Novel Discoveries in Universe Evolution

4MOST Cosmology Redshift Survey: BG and LRG Target Selection

10 Jun 2025, 18:15

1h 45m

Main auditorium (École de physique, Quai Ernest-Ansermet 24, 1205 Genève, Suisse)

poster Apèro and Poster session

Speaker

Aurélien Verdier (EPFL)

Description

The 4-metre Multi-Object Spectroscopic Telescope is currently being installed on the VISTA Telescope (Paranal) and will start observations of multiple science cases at the end of this year. One of the 18 experiments is the Cosmology Redshift Survey (CRS) which is composed of 4 samples: Bright Galaxies (BG, 0.15 < z < 0.4), Luminous Red Galaxies (LRG, 0.4 < z < 1.0), Quasars (QSO, 0.9 < z < 2.2) and Lyman-forest Quasars (QSO-Lyalpha, 2.2 < z < 3.5).
These samples will be used to perform spectroscopic clustering measurements but also provide spectroscopic redshifts for other photometric surveys as the LSST, or future southern radio telescopes as the Hydrogen Intensity and Real-time Analysis eXperiment (HIRAX) or the Square Kilometre Array (SKA).
In this talk, I will present an overview of 4MOST as well as a description of the BG and LRG samples