Gas loss in simulated galaxies as they fall into clusters

Renyue Cen, Ana Roxana Pop, Neta A. Bahcall

Research output: Contribution to journalArticlepeer-review

20 Scopus citations


We use high-resolution cosmological hydrodynamic galaxy formation simulations to gain insights into how galaxies lose their cold gas at low redshift as they migrate from the field to the high-density regions of clusters of galaxies. We find that beyond three cluster virial radii, the fraction of gas-rich galaxies is constant, representing the field. Within three cluster-centric radii, the fraction of gas-rich galaxies declines steadily with decreasing radius, reaching <10% near the cluster center. Our results suggest galaxies start to feel the effect of the cluster environment on their gas content well beyond the cluster virial radius. We show that almost all gas-rich galaxies at the cluster virial radius are falling in for the first time at nearly radial orbits. Furthermore, we find that almost no galaxy moving outward at the cluster virial radius is gas-rich (with a gas-to-baryon ratio greater than 1%). These results suggest that galaxies that fall into clusters lose their cold gas within a single radial round-trip.

Original languageEnglish (US)
Pages (from-to)7914-7919
Number of pages6
JournalProceedings of the National Academy of Sciences of the United States of America
Issue number22
StatePublished - Jun 3 2014

All Science Journal Classification (ASJC) codes

  • General


  • Cosmology
  • Intergalactic medium
  • Large-scale structure of universe
  • Observations


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