H${}_2$ content of galaxies inside and around intermediate redshift clusters

Abstract

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 $z\sim 0.5$. 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.

arXiv comment5 pages, 4 figures, Proceedings of IAUS 359, Storchi-Bergmann et al. ed

References in corpus (9)

• The CO-to-H2 Conversion Factor
• The Star Formation Efficiency in Nearby Galaxies: Measuring Where Gas Forms Stars Effectively
• A Highly Consistent Framework for the Evolution of the Star-Forming "Main Sequence" from z~0-6
• A simple model to interpret the ultraviolet, optical and infrared emission from galaxies
• Molecular Gas at High Redshift
• PHIBSS: Unified Scaling Relations of Gas Depletion Time and Molecular Gas Fractions
• The build-up of the colour-magnitude relation in galaxy clusters since z~0.8
• PHIBSS: Exploring the Dependence of the CO-H${}_2$ Conversion Factor on Total Mass Surface Density at $z<1.5$
• A blind CO detection of a Distant Red Galaxy in the HS1700+64 proto-cluster