Explaining the enhanced star formation rate of Jellyfish galaxies in galaxy clusters

Abstract

We study the recently observed JellyFish galaxies (JFGs), which are found to have their gas content ram-pressure stripped away in galaxy clusters. These galaxies are observed to have an enhanced star formation rate of about 0.2 dex compared with a control sample of the same stellar mass in their disks. We model the increase in the star formation efficiency as a function of interacluster medium pressure and parametrize the cold gas content of the galaxies as a function of cluster-centric distance. We show that regarding the external pressure as a positive feedback results in agreement with the observed distribution of enhanced star formation in the JFGs if clouds are shielded from evaporation by magnetic fields. Our results predict that satellites with halo mass $<10^{11}{M}_{\odot }$ moving with Mach numbers $\mathcal{M}\approx 2$, and inclination angles below 60 degrees, are more likely to be detected as JFGs.

accepted for publication in MNRAS Letters

References in corpus (7)

• Cold gas stripping in satellite galaxies: from pairs to clusters
• The Launching of Cold Clouds by Galaxy Outflows I: Hydrodynamic Interactions with Radiative Cooling
• Ram pressure stripping of disc galaxies orbiting in clusters. I. Mass and radius of the remaining gas disc
• Extragalactic Zeeman Detections in OH Megamasers
• Evolutionary phases of gas-rich galaxies in a galaxy cluster at z=1.46
• The fate of the gaseous disks of galaxies that fall into clusters
• The Fate of Gas rich Satellites in Clusters

Cited by in corpus (10)

• Ram Pressure Stripping in High-Density Environments
• The better half -- Asymmetric star-formation due to ram pressure in the EAGLE simulations
• Jellyfish galaxy candidates in MACS J0717.5+3745 and thirty-nine other clusters of the DAFT/FADA and CLASH surveys
• Satellite galaxies in groups in the CIELO Project I. Gas removal from galaxies and its re-distribution in the intragroup medium
• Warped Disk Galaxies. I. Linking U type Warps in Groups/Clusters to Jellyfish Galaxies
• The relationship between cluster environment and molecular gas content of star-forming galaxies in the EAGLE simulation
• Differences in the Physical Properties of Satellite Galaxies within Relaxed and Disturbed Galaxy Groups and Clusters
• A new way to constrain the densities of intra-group medium in groups of galaxies with convolutional neural networks
• The Way to Quench: Galaxy evolution in Abell 2142
• Dashing through the cluster: An X-ray to radio view of UGC 10420 undergoing ram-pressure stripping