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- W4387136290 abstract "Abstract Cluster galaxies are affected by the surrounding environment, which influences, in particular, their gas, stellar content, and morphology. In particular, the ram pressure exerted by the intracluster medium promotes the formation of multiphase tails of stripped gas detectable both at optical wavelengths and in the submillimeter and radio regimes, tracing the cold molecular and atomic gas components, respectively. In this work we analyze a sample of 16 galaxies belonging to clusters at redshift ∼0.05 showing evidence of an asymmetric H i morphology (based on MeerKAT observations) with and without a star-forming tail. To this sample we add three galaxies with evidence of a star-forming tail and no H i detection. Here we present the galaxies’ H 2 gas content from APEX observations of the CO (2–1) emission. We find that in most galaxies with a star-forming tail the H 2 global content is enhanced with respect to undisturbed field galaxies with similar stellar masses, suggesting an evolutionary path driven by the ram pressure stripping. As galaxies enter into the clusters, their H i is displaced but also partially converted into H 2 , so that they are H 2 enriched when they pass close to the pericenter, that is, when they also develop the star-forming tails that are well visible in UV or B broad bands and in H α emission. An inspection of the phase-space diagram for our sample suggests an anticorrelation between the H i and H 2 gas phases as galaxies fall into the cluster potential. This peculiar behavior is a key signature of the ram pressure stripping in action." @default.
- W4387136290 created "2023-09-29" @default.
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- W4387136290 date "2023-09-28" @default.
- W4387136290 modified "2023-10-01" @default.
- W4387136290 title "The Evolution of the Cold Gas Fraction in Nearby Clusters’ Ram-pressure-stripped Galaxies" @default.
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