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

Peter D. Mitchell; Jérémy Blaizot; Julien Devriendt; Taysun Kimm; Léo Michel-Dansac; Joakim Rosdahl; Adrianne Slyz

doi:10.1093/mnras/stx3017

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

Peter D. Mitchell, Jérémy Blaizot, Julien Devriendt, Taysun Kimm, Léo Michel-Dansac, Joakim Rosdahl, Adrianne Slyz

Research output: Contribution to journal › Article › peer-review

21 Citations (Scopus)

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- 10¹¹M⊙). 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.

Original language	English
Pages (from-to)	4279-4301
Number of pages	23
Journal	Monthly Notices of the Royal Astronomical Society
Volume	474
Issue number	4
DOIs	https://doi.org/10.1093/mnras/stx3017
Publication status	Published - 2018 Mar 1

Bibliographical note

Funding Information:
We thank Matthieu Schaller for making data from the no-feedback EAGLE simulation available to us. We are grateful to the LABEX Lyon Institute of Origins (ANR-10-LABX-0066) of the Université de Lyon for its financial support within the programme ‘Investisse-ments d’Avenir’ (ANR-11-IDEX-0007) of the French government operated by the National Research Agency (ANR). Simulations were run at the Common Computing Facility (CCF) of LABEX LIO. JB and JR acknowledge support for the ORAGE project from the Agence Nationale de la Recherche under grant ANR-14-CE33-0016-03. TK acknowledges support by the ERC Advanced Grant 320596 ‘The Emergence of Structure during the Epoch of Reioniza- tion’ and the National Research Foundation of Korea to the Center for Galaxy Evolution Research (No. 2017R1A5A1070354).

Publisher Copyright:
© 2017 The Author(s).

All Science Journal Classification (ASJC) codes

Astronomy and Astrophysics
Space and Planetary Science

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10.1093/mnras/stx3017

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title = "Gas flows in the circumgalactic medium around simulated high-redshift galaxies",

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- 1011M⊙). 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.",

author = "Mitchell, {Peter D.} and J{\'e}r{\'e}my Blaizot and Julien Devriendt and Taysun Kimm and L{\'e}o Michel-Dansac and Joakim Rosdahl and Adrianne Slyz",

note = "Funding Information: We thank Matthieu Schaller for making data from the no-feedback EAGLE simulation available to us. We are grateful to the LABEX Lyon Institute of Origins (ANR-10-LABX-0066) of the Universit{\'e} de Lyon for its financial support within the programme {\textquoteleft}Investisse-ments d{\textquoteright}Avenir{\textquoteright} (ANR-11-IDEX-0007) of the French government operated by the National Research Agency (ANR). Simulations were run at the Common Computing Facility (CCF) of LABEX LIO. JB and JR acknowledge support for the ORAGE project from the Agence Nationale de la Recherche under grant ANR-14-CE33-0016-03. TK acknowledges support by the ERC Advanced Grant 320596 {\textquoteleft}The Emergence of Structure during the Epoch of Reioniza- tion{\textquoteright} and the National Research Foundation of Korea to the Center for Galaxy Evolution Research (No. 2017R1A5A1070354). Publisher Copyright: {\textcopyright} 2017 The Author(s).",

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doi = "10.1093/mnras/stx3017",

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AU - Mitchell, Peter D.

AU - Blaizot, Jérémy

AU - Devriendt, Julien

AU - Kimm, Taysun

AU - Michel-Dansac, Léo

AU - Rosdahl, Joakim

AU - Slyz, Adrianne

N1 - Funding Information: We thank Matthieu Schaller for making data from the no-feedback EAGLE simulation available to us. We are grateful to the LABEX Lyon Institute of Origins (ANR-10-LABX-0066) of the Université de Lyon for its financial support within the programme ‘Investisse-ments d’Avenir’ (ANR-11-IDEX-0007) of the French government operated by the National Research Agency (ANR). Simulations were run at the Common Computing Facility (CCF) of LABEX LIO. JB and JR acknowledge support for the ORAGE project from the Agence Nationale de la Recherche under grant ANR-14-CE33-0016-03. TK acknowledges support by the ERC Advanced Grant 320596 ‘The Emergence of Structure during the Epoch of Reioniza- tion’ and the National Research Foundation of Korea to the Center for Galaxy Evolution Research (No. 2017R1A5A1070354). Publisher Copyright: © 2017 The Author(s).

PY - 2018/3/1

Y1 - 2018/3/1

N2 - 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- 1011M⊙). 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.

AB - 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- 1011M⊙). 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.

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

Abstract

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