The Effect of Halo Mass on the HI Content of Galaxies in Groups and Clusters

Abstract

We combine data from the Sloan Digital Sky Survey (SDSS) and the Arecibo Legacy Fast ALFA Survey (ALFALFA) to study the cold atomic gas content of galaxies in groups and clusters in local universe. A careful cross-matching of galaxies in the SDSS, ALFALFA and SDSS group catalogs provides a sample of group galaxies with stellar masses $10^{8.4}{M}_{\odot }\le M_{\ast }\le 10^{10.6}{M}_{\odot }$ and group halo masses $10^{12.5}{h}^{-1}{M}_{\odot }\le M_h\le 10^{15.0}{h}^{-1}{M}_{\odot }$. Controlling our sample in stellar mass and redshift, we find no significant radial variation in the galaxy \hi\ gas-to-stellar mass ratio for the halo mass range in our sample. However, the fraction of galaxies detected in ALFALFA declines steadily towards the centers of groups with the effect being most prominent in the most massive halos. In the outskirts of massive halos a hint of a depressed detection fraction for low mass galaxies suggests pre-processing that decreases the \hi\ in these galaxies before they fall into massive clusters. We interpret the decline in the ALFALFA detection of galaxies in the context of a threshold halo mass for ram pressure stripping for a given galaxy stellar mass. The lack of an observable decrease in the galaxy \hi\ gas-to-stellar mass ratio with the position of galaxies within groups and clusters highlights the difficulty of detecting the impact of environment on the galaxy \hi\ content in a shallow \hi\ survey.

35 pages, 11 figures, ApJ in press

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• MIGHTEE-HI: The HI emission project of the MeerKAT MIGHTEE survey
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• WALLABY Pilot Survey: HI gas disc truncation and star formation of galaxies falling into the Hydra I cluster
• Ram pressure stripping of HI-rich galaxies infalling into massive clusters
• HI gas content of SDSS galaxies revealed by ALFALFA: implications for the mass-metallicity relation and the environmental dependence of HI in the local Universe
• Discovery of a Damped Ly-alpha System in a Low-z Galaxy Group: Possible Evidence for Gas Inflow and Nuclear Star Formation
• The effects of environment on the intrinsic shape of galaxies
• The HI and stellar mass bivariate distribution of centrals and satellites for all, late- and early-type local galaxies
• SOMBI: Bayesian identification of parameter relations in unstructured cosmological data