http://arxiv.org/abs/2304.09196
Jellyfish galaxies are the prototypical examples of satellite galaxies undergoing strong ram pressure stripping (RPS). We analyze the evolution of 535 unique, first-infalling jellyfish galaxies from the TNG50 cosmological hydrodynamical galaxy simulation. These have been visually inspected to be undergoing RPS sometime in the past 5 billion years (since $z=0.5$), have satellite stellar masses $M_{\star}^{\rm sat}\sim10^{8-10.5}{\rm M}\odot$, and live in hosts with $M{\rm 200c}\sim10^{12-14.3}{\rm M}\odot$ at $z=0$. We quantify the cold gas $(\leq10^{4.5}$K) removal using the tracer particles, confirming that for these jellyfish, RPS is the dominant driver of cold gas loss after infall. Half of these jellyfish are completely devoid of cold gas by $z=0$, and these galaxies have earlier infall times and smaller satellite-to-host mass ratios than those that still have some gas today. RPS can act on jellyfish galaxies over long timescales of $\approx1.5-8$Gyr. Jellyfish in more massive hosts are impacted by RPS for a shorter time span and, at a fixed host halo mass, jellyfish with lower stellar masses at $z=0$ have shorter RPS time spans. While RPS may act for long periods of time, the peak RPS period — where at least 50% of the total RPS occurs — begins within $\approx1$Gyr of infall and lasts $\lesssim2$Gyr. During this period, the jellyfish are at host-centric distances between $\sim0.2-2R{\rm 200c}$, illustrating that much of RPS occurs at large distances from the host galaxy. Jellyfish continue forming stars until they have lost $\approx98$% of their cold gas. For groups and clusters in TNG50 $(M_{\rm 200c}\sim10^{13-14.3}{\rm M}\odot)$, jellyfish galaxies deposit more cold gas ($\sim10^{11-12}{\rm M}\odot$) into halos than exist in them at $z=0$, demonstrating that jellyfish, and in general satellite galaxies, are a significant source of cold gas accretion.
E. Rohr, A. Pillepich, D. Nelson, et. al.
Thu, 20 Apr 23
16/57
Comments: 20 pages, 11 figures + 3 appendices with 4 figures. Submitted to MNRAS. Key figures are 2, 8, 9, 11. See additional jellyfish companion papers today on astro-ph: Zinger+ and Goeller+. All data used in this publication, including the Cosmological Jellyfish Project results, are publicaly available