Gas flows in the circumgalactic medium around simulated high-redshift galaxies - Archive ouverte HAL Access content directly
Journal Articles Monthly Notices of the Royal Astronomical Society Year : 2018

Gas flows in the circumgalactic medium around simulated high-redshift galaxies

(1) , (1) , (1) , , (1) , (1) ,
1

Abstract

We analyse the properties of circumgalactic gas around simulated galaxies in the redshift range z ≥ 3, utilizing a new sample of cosmological zoom simulations. These simulations are intended to be representative of the observed samples of Lyman α (Ly α) emitters recently obtained with the multi unit spectroscopic explorer (MUSE) instrument (halo masses ∼1010-1011 M). We show that supernova feedback has a significant impact on both the inflowing and outflowing circumgalactic medium (CGM) by driving outflows, reducing diffuse inflow rates, and by increasing the neutral fraction of inflowing gas. By temporally stacking simulation outputs, we find that significant net mass exchange occurs between inflowing and outflowing phases: none of the phases are mass-conserving. In particular, we find that the mass in neutral outflowing hydrogen declines exponentially with radius as gas flows outwards from the halo centre. This is likely caused by a combination of both fountain-like cycling processes and gradual photoionization/collisional ionization of outflowing gas. Our simulations do not predict the presence of fast-moving neutral outflows in the CGM. Neutral outflows instead move with modest radial velocities (∼50 km s-1), and the majority of the kinetic energy is associated with tangential rather than radial motion.
Fichier principal
Vignette du fichier
stx3017.pdf (3.58 Mo) Télécharger le fichier
Origin : Publisher files allowed on an open archive

Dates and versions

insu-03711234 , version 1 (01-07-2022)

Identifiers

Cite

Peter D. Mitchell, Jérémy Blaizot, Julien Devriendt, Taysun Kimm, Léo Michel-Dansac, et al.. Gas flows in the circumgalactic medium around simulated high-redshift galaxies. Monthly Notices of the Royal Astronomical Society, 2018, 474, pp.4279-4301. ⟨10.1093/mnras/stx3017⟩. ⟨insu-03711234⟩
12 View
2 Download

Altmetric

Share

Gmail Facebook Twitter LinkedIn More