Oral Presentation

Gas Depletion and Star Formation Quenching in Nearby Galaxy Clusters

Author(s): Kana Morokuma (U. Tokyo)

Presenter: Kana Morokuma (University of Tokyo)

Nearby galaxy clusters are known to host a significant fraction of star formation-quenched galaxies. Mechanisms include direct interstellar gas stripping (e.g., ram-pressure stripping, tidal interactions) and gradual gas depletion like strangulation, which cuts off future gas supply. Reduced star formation efficiency despite gas presence is also a possibility. Historically, atomic gas observations indicated gas depletion in cluster galaxies, but molecular gas observations showed conflicting results. Recent detailed ALMA surveys, however, demonstrate that both atomic and molecular gas are indeed depleted in cluster galaxies. This talk will present statistical findings from these surveys and our current understanding of gas stripping mechanisms and star-formation properties derived from detailed observations of individual objects.