H\(_2\) content of galaxies inside and around intermediate redshift clusters

Dense environments have an impact on the star formation rate of galaxies. As stars form from molecular gas, looking at the cold molecular gas content of a galaxy gives useful insights on its efficiency in forming stars. However, most galaxies observed in CO (a proxy for the cold molecular gas conten...

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Bibliographic Details
Published in:arXiv.org 2020-05
Main Author: Spérone-Longin, Damien
Format: Article
Language:English
Subjects:
Carbon monoxide
Environmental impact
Galactic clusters
Galactic evolution
Galaxies
Mass ratios
Molecular gases
Red shift
Star & galaxy formation
Star clusters
Star formation rate
Stellar mass
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Summary:Dense environments have an impact on the star formation rate of galaxies. As stars form from molecular gas, looking at the cold molecular gas content of a galaxy gives useful insights on its efficiency in forming stars. However, most galaxies observed in CO (a proxy for the cold molecular gas content) at intermediate redshifts, are field galaxies. Only a handful of studies focused on cluster galaxies. I present new results on the environment of one medium mass cluster from the EDisCS survey at \(z\sim0.5\). 27 star-forming galaxies were selected to evenly sample the range of densities encountered inside and around the cluster. We cover a region extending as far as 8 virial radii from the cluster center. Indeed there is ample evidence that star formation quenching starts already beyond 3 cluster virial radius. I discuss our CO(3-2) ALMA observations, which unveil a large fraction of galaxies with low gas-to-stellar mass ratios.
ISSN:2331-8422
DOI:10.48550/arxiv.2004.06449