Rohr, Eric;
Pillepich, Annalisa;
Nelson, Dylan;
Zinger, Elad;
Joshi, Gandhali D;
Ayromlou, Mohammadreza;
(2023)
Jellyfish galaxies with the IllustrisTNG simulations – When, where, and for how long does ram pressure stripping of cold gas occur?
Monthly Notices of the Royal Astronomical Society
, 524
pp. 3502-3525.
10.1093/mnras/stad2101.
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Abstract
Jellyfish galaxies are prototypical examples of satellite galaxies undergoing strong ram pressure stripping (RPS). We analyze the evolution of 512 unique, first-infalling jellyfish galaxies from the TNG50 cosmological 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 $M_\star ^{\rm sat}\sim 10^{8-10.5}\, {\rm M}_\odot$, and live in hosts with M200c ∼ 1012 − 14.3 M⊙ at z = 0. We quantify the cold gas (T ≤ 104.5 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 gas-less by z = 0, and these galaxies have earlier infall times and smaller satellite-to-host mass ratios than their gaseous counterparts. RPS can act on jellyfish galaxies over long time scales of ≈1.5 − 8 Gyr. Jellyfish in more massive hosts are impacted by RPS for a shorter time span and, at a fixed host mass, jellyfish with less cold gas at infall and 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 per cent of the total RPS occurs – begins within ≈1 Gyr of infall and lasts ≲ 2 Gyr. During this period, the jellyfish are at host-centric distances ∼0.2 − 2R200c, illustrating that much of RPS occurs at large distances from the host galaxy. Interestingly, jellyfish continue forming stars until they have lost ≈98 per cent of their cold gas. For groups and clusters in TNG50 $(M_{\rm 200c}^{\rm host}\sim 10^{13-14.3}\, {\rm M}_\odot )$, jellyfish galaxies deposit more cold gas (∼1011 − 12 M⊙) 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.
| Type: | Article |
|---|---|
| Title: | Jellyfish galaxies with the IllustrisTNG simulations – When, where, and for how long does ram pressure stripping of cold gas occur? |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1093/mnras/stad2101 |
| Publisher version: | https://doi.org/10.1093/mnras/stad2101 |
| Language: | English |
| Additional information: | This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third-party material in this article are included in the Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/ |
| Keywords: | Methods: numerical –galaxies: clusters: intracluster medium –galaxies: evolution –galaxies: formation –galaxies: haloes –galaxies: interactions. |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Physics and Astronomy |
| URI: | https://discovery-pp.ucl.ac.uk/id/eprint/10174225 |
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