4MOST Consortium Survey 5: eROSITA Galaxy Cluster Redshift Survey
A. Finoguenov, A. Merloni, J. Comparat, K. Nandra, M. Salvato, E., Tempel, A. Raichoor, J. Richard, J.-P. Kneib, A. Pillepich, M. Sahl\'en, P., Popesso, P. Norberg, R. McMahon (for the 4MOST collaboration)

TL;DR
This survey combines eROSITA X-ray data with 4MOST spectroscopy to identify and analyze galaxy groups and clusters, aiming to improve mass estimates and understand large-scale structures across a wide redshift range.
Contribution
It provides the first large-scale spectroscopic redshift survey of eROSITA-detected galaxy clusters, enabling dynamical mass calibration and studies of cosmic filaments.
Findings
Spectroscopic redshifts for 40,000 galaxy clusters and groups.
Calibration of cluster masses for cosmological studies.
Detection of X-ray emission from filaments and low-mass groups.
Abstract
Groups and clusters of galaxies are a current focus of astronomical research owing to their role in determining the environmental effects on galaxies and the constraints they provide to cosmology. The eROSITA X-ray telescope on board the Spectrum Roentgen Gamma observatory will be launched in 2019 and will have completed eight scans of the full sky when 4MOST starts operating. The experiment will detect groups and clusters of galaxies through X-ray emission from the hot intergalactic medium. The purpose of the 4MOST eROSITA Galaxy Cluster Redshift Survey is to provide spectroscopic redshifts of the optical counterparts to the X-ray emission from 40,000 groups and clusters of galaxies so as to perform dynamical estimates of the total mass and to measure the properties of the member galaxies. The survey aims to obtain precise redshift measurements of the photometrically identified…
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