1 research outputs found
Jellyfish galaxies with the IllustrisTNG simulations -- When, where, and for how long does ram pressure stripping of cold gas occur?
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 ), have
satellite stellar masses , and
live in hosts with at . We
quantify the cold gas 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
, 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 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
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
Gyr of infall and lasts Gyr. During this period, the
jellyfish are at host-centric distances between ,
illustrating that much of RPS occurs at large distances from the host galaxy.
Jellyfish continue forming stars until they have lost % of their
cold gas. For groups and clusters in TNG50 , jellyfish galaxies deposit more cold gas () into halos than exist in them at , demonstrating that
jellyfish, and in general satellite galaxies, are a significant source of cold
gas accretion.Comment: 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 availabl