NGC 3314a/b and NGC 3312: Ram pressure stripping in Hydra I cluster substructure

Hess, Kelley M.; Kotulla, Ralf; Chen, H.; Carignan, C.; Gallagher, J.; Jarrett, T. H.; Kraan-Korteweg, R. C.

doi:10.1051/0004-6361/202243412

Cited by 10 publications

(3 citation statements)

References 179 publications

(244 reference statements)

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“…There is an increasing consensus building up in the recent literature that most of the enhanced star formation in RPS galaxies is observed on the ‘leading edge’ of the galaxies (Gavazzi et al, 2015; Vulcani et al, 2018; Hess et al, 2022; Roberts et al, 2022a). Such galaxies, showing an unambiguous tail of material stripped from the disc are often called the ‘jellyfish galaxies’ and are considered to be a product of RPS in clusters.…”

Section: Discussionmentioning

confidence: 99%

Dashing through the cluster: An X-ray to radio view of UGC 10420 undergoing ram-pressure stripping

Mahajan

Singh²,

Tiwari³

et al. 2023

Publ. Astron. Soc. Aust.

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We present multi-wavelength data and analysis, including new FUV AstroSat/UVIT observations of the spiral galaxy UGC 10420 (z = 0.032), a member of the cluster Abell 2199. UGC 10420 is present on the edge of the X-ray emitting region of the cluster at a distance of ∼ 680 kpc from the centre. The far-ultraviolet (FUV) data obtained by the AstroSat mission show intense knots of star formation on the leading edge of the galaxy, accompanied by a tail of the same on the diametrically opposite side. Our analysis shows that the images of the galaxy disk in the optical and mid-infrared are much smaller in size than that in the FUV. While the broadband optical colours of UGC 10420 are typical of a post-starburst galaxy, the star formation rate (SFR) derived from a UV-to-IR spectral energy distribution is at least a factor of nine higher than that expected for a star-forming field galaxy of similar mass at its redshift. A careful removal of the contribution of the diffuse intracluster gas shows that the significant diffuse X-ray emission associated with the inter-stellar medium of UGC 10420 has a temperature, and luminosity, L X = 1.8 ± 0.9 × 1040 erg s−1, which are typical of the X-ray emission from late-type spiral galaxies. Two symmetrically placed X-ray hot spots are observed on either sides of an X-ray weak nucleus. Our analysis favours a scenario where the interaction of a galaxy with the hot intra-cluster medium of the cluster, perturbs the gas in the galaxy causing starburst in the leading edge of the disk. On the other hand, the turbulence thus developed may also push some of the gas out of the disk. Interactions between the gas ejected from the galaxy and the intracluster medium can then locally trigger star formation in the wake of the galaxy experiencing ram-pressure stripping. Our data however does not rule out the possibility of a flyby encounter with a neighbouring galaxy, although no relevant candidates are observed in the vicinity of UGC 10420.

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Section: Discussionmentioning

confidence: 99%

Dashing through the cluster: An X-ray to radio view of UGC 10420 undergoing ram-pressure stripping

Mahajan

Singh²,

Tiwari³

et al. 2023

Publ. Astron. Soc. Aust.

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“…Unfortunately, the spatial resolution of our H I VLA data does not allow a mapping of the depletion time, but only the derivation of a global value. Before the advent of MUSE, in fact, RPS was already a well-known mechanism, as H I dedicated studies of nearby clusters already demonstrated how this phenomenon is able to produce galaxies with asymmetric disks, sometimes leading to cold gas tails and to almost completely stripped disks (Kenney & Young 1989;Kenney et al 2004;Chung et al 2007;Cortese et al 2010;Hess et al 2022). Further evidence of stripping has also been detected using X-ray emission (Sun et al 2010;Jachym et al 2017;Campitiello et al 2021;Bartolini et al 2022) and lowfrequency data (Gavazzi 1978;Gavazzi et al 1995;Roberts et al 2021;Ignesti et al 2022).…”

Section: Introductionmentioning

confidence: 95%

The Evolution of the Cold Gas Fraction in Nearby Clusters’ Ram-pressure-stripped Galaxies

Moretti,

Serra,

Bacchini

et al. 2023

ApJ

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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’ H2 gas content from APEX observations of the CO (2–1) emission. We find that in most galaxies with a star-forming tail the H2 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 H2, so that they are H2 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 Hα emission. An inspection of the phase-space diagram for our sample suggests an anticorrelation between the H i and H2 gas phases as galaxies fall into the cluster potential. This peculiar behavior is a key signature of the ram pressure stripping in action.

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“…Indeed, cluster galaxies often contain less atomic gas than expected from their optical size or stellar mass and have truncated and/or asymmetric H I disks (Chamaraux et al 1980;Haynes et al 1984;Giovanelli & Haynes 1985;Cayatte et al 1990;Schröder et al 2001;Solanes et al 2001;Waugh et al 2002;Chung et al 2009;Loni et al 2021;Zabel et al 2022). Morever, long tails of atomic gas are commonly observed in cluster galaxies (Bravo-Alfaro et al 2000;Kenney et al 2004;Chung et al 2007;Scott et al 2010;Sorgho et al 2017;Ramatsoku et al 2019;Deb et al 2020;Ramatsoku et al 2020;Healy et al 2021;Deb et al 2022;Hess et al 2022).…”

Section: Introductionmentioning

confidence: 99%

3D Modeling of the Molecular Gas Kinematics in Optically Selected Jellyfish Galaxies

Mingozzi

Poggianti

Moretti

et al. 2023

ApJ

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Cluster galaxies are subject to the ram pressure exerted by the intracluster medium, which can perturb or even strip away their gas while leaving the stars undisturbed. We model the distribution and kinematics of the stars and the molecular gas in four late-type cluster galaxies (JO201, JO204, JO206, and JW100), which show tails of atomic and ionized gas indicative of ongoing ram pressure stripping. We analyze MUSE@VLT data and CO data from the Atacama Large Millimeter Array searching for signatures of radial gas flows, ram pressure stripping, and other perturbations. We find that all galaxies, with the possible exception of JW100, host stellar bars. Signatures of ram pressure are found in JO201 and JO206, which also shows clear indications of ongoing stripping in the molecular disk outskirts. The stripping affects the whole molecular gas disk of JW100. The molecular gas kinematics in JO204 is instead dominated by rotation rather than ram pressure. We also find indications of enhanced turbulence of the molecular gas compared to field galaxies. Large-scale radial flows of molecular gas are present in JO204 and JW100, but more uncertain in JO201 and JO206. We show that our sample follows the molecular gas mass–size relation, confirming that it is essentially independent of environment even for the most extreme cases of stripping. Our findings are consistent with the molecular gas being affected by the ram pressure on different timescales and less severely than the atomic and ionized gas phases, likely because the molecular gas is denser and more gravitationally bound to the galaxy.

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NGC 3314a/b and NGC 3312: Ram pressure stripping in Hydra I cluster substructure

Cited by 10 publications

References 179 publications

Dashing through the cluster: An X-ray to radio view of UGC 10420 undergoing ram-pressure stripping

Dashing through the cluster: An X-ray to radio view of UGC 10420 undergoing ram-pressure stripping

The Evolution of the Cold Gas Fraction in Nearby Clusters’ Ram-pressure-stripped Galaxies

3D Modeling of the Molecular Gas Kinematics in Optically Selected Jellyfish Galaxies

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