Explaining the enhanced star formation rate of Jellyfish galaxies in galaxy clusters. (arXiv:1904.05900v1 [astro-ph.GA])

Explaining the enhanced star formation rate of Jellyfish galaxies in galaxy clusters. (arXiv:1904.05900v1 [astro-ph.GA])
<a href="http://arxiv.org/find/astro-ph/1/au:+Safarzadeh_M/0/1/0/all/0/1">Mohammadtaher Safarzadeh</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Loeb_A/0/1/0/all/0/1">Abraham Loeb</a>

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 $mathcal{M}approx2$, and inclination angles below 60 degrees, are more likely to be detected as JFGs.

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 $mathcal{M}approx2$, and
inclination angles below 60 degrees, are more likely to be detected as JFGs.

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