Skip to main content

Research Repository

Advanced Search

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.

The environmental dependence of H I in galaxies in the EAGLE simulations Thumbnail


Authors

A. Marasco

R.A. Crain

J. Schaye

Y.M. Bahé

T. van der Hulst

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

Files

Published Journal Article (3.6 Mb)
PDF

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.





You might also like



Downloadable Citations