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23 January 2025 |
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The evolution of the cold gas fraction in nearby clusters ram-pressure stripped galaxies | | Alessia Moretti
; Paolo Serra
; Cecilia Bacchini
; Rosita Paladino
; Mpati Ramatsoku
; Bianca M. Poggianti
; Benedetta Vulcani
; Tirna Deb
; Marco Gullieuszik
; Jacopo Fritz
; Anna Wolter
; | | Date: |
1 Sep 2023 | | 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 multi-phase tails of stripped gas detectable both at optical
wavelengths and in the sub-mm and radio regimes, tracing the cold molecular and
atomic gas components, respectively. In this work we analyze a sample of
sixteen galaxies belonging to clusters at redshift $sim 0.05$ showing evidence
of an asymmetric HI 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 HI detection. Here we present the galaxies $
m 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 $
m 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 HI is displaced but also partially
converted into $
m H_{2}$, so that they are $
m H_{2}$ enriched when they
pass close to the pericenter, i. e. when they develop the star forming tails
that are visible in UV/B broad bands and in H$alpha$ emission. An inspection
of the phase-space diagram for our sample suggests an anticorrelation between
the HI and $
m H_{2}$ gas phases as galaxies fall into the cluster potential.
This peculiar behaviour is a key signature of the ram-pressure stripping in
action. | | Source: | arXiv, 2309.00449 | | Services: | Forum | Review | PDF | Favorites | |
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