A. Marasco
The environmental dependence of H I in galaxies in the EAGLE simulations
Marasco, A.; Crain, R.A.; Schaye, J.; Bahé, Y.M.; van der Hulst, T.; Theuns, T.; Bower, R.G.
Authors
R.A. Crain
J. Schaye
Y.M. Bahé
T. van der Hulst
Professor Tom Theuns tom.theuns@durham.ac.uk
Professor
R.G. Bower
Abstract
We use the EAGLE suite of cosmological hydrodynamical simulations to study how the H I content of present-day galaxies depends on their environment. We show that EAGLE reproduces observed H I mass–environment trends very well, while semi-analytic models typically overpredict the average H I masses in dense environments. The environmental processes act primarily as an on/off switch for the H I content of satellites with M* > 109 M⊙. At a fixed M*, the fraction of H I-depleted satellites increase with increasing host halo mass M200 in response to stronger environmental effects, while at a fixed M200 it decreases with increasing satellite M* as the gas is confined by deeper gravitational potentials. H I-depleted satellites reside mostly, but not exclusively, within the virial radius r200 of their host halo. We investigate the origin of these trends by focusing on three environmental mechanisms: ram pressure stripping by the intragroup medium, tidal stripping by the host halo and satellite–satellite encounters. By tracking back in time the evolution of the H I-depleted satellites, we find that the most common cause of H I removal is satellite encounters. The time-scale for H I removal is typically less than 0.5 Gyr. Tidal stripping occurs in haloes of M200 < 1014 M⊙ within 0.5 × r200, while the other processes act also in more massive haloes, generally within r200. Conversely, we find that ram pressure stripping is the most common mechanism that disturbs the H I morphology of galaxies at redshift z = 0. This implies that H I removal due to satellite–satellite interactions occurs on shorter time-scales than the other processes.
Citation
Marasco, A., Crain, R., Schaye, J., Bahé, Y., van der Hulst, T., Theuns, T., & Bower, R. (2016). The environmental dependence of H I in galaxies in the EAGLE simulations. Monthly Notices of the Royal Astronomical Society, 461(3), 2630-2649. https://doi.org/10.1093/mnras/stw1498
Journal Article Type | Article |
---|---|
Acceptance Date | Jun 18, 2016 |
Online Publication Date | Jun 24, 2016 |
Publication Date | Jun 24, 2016 |
Deposit Date | Sep 28, 2016 |
Publicly Available Date | Mar 29, 2024 |
Journal | Monthly Notices of the Royal Astronomical Society |
Print ISSN | 0035-8711 |
Electronic ISSN | 1365-2966 |
Publisher | Royal Astronomical Society |
Peer Reviewed | Peer Reviewed |
Volume | 461 |
Issue | 3 |
Pages | 2630-2649 |
DOI | https://doi.org/10.1093/mnras/stw1498 |
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Copyright Statement
This article has been published in Monthly Notices of the Royal Astronomical Society ©: 2016 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.
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