HI gas in clusters

F. Villaescusa-Navarro et al. (2015): Neutral hydrogen in galaxy clusters: impact of AGN feedback and implications for intensity mapping

This paper discusses the neutral hydrogen content in simulations of galaxy clusters. In particular, we find that AGN feedback reduces the amount of neutral hydrogen significantly. My favorite plot is in the Appendix: Fig. A4 shows how the fraction of HI hosted by galaxies decreases with halo mass.