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Title: Inhomogeneous reionization models in cosmological hydrodynamical simulations

Abstract

Here, we present a new hybrid method to simulate the thermal effects of reionization in cosmological hydrodynamical simulations. The method improves upon the standard approach used in simulations of the intergalactic medium (IGM) and galaxy formation without a significant increase in the computational cost, thereby allowing for efficient exploration of the parameter space. The method uses a small set of phenomenological input parameters, and combines a seminumerical reionization model to solve for the topology of reionization with an approximate model of how reionization heats the IGM, using the massively parallel Nyx hydrodynamics code which is specifically designed to solve for the structure of diffuse IGM gas. We have produced several medium-scale, high-resolution simulations (2048 3, L box = 40 Mpc h -1) with various instantaneous and inhomogeneous HI reionization models that use this new methodology. We study the IGM thermal properties of these models and find that large-scale temperature fluctuations extend well beyond the end of reionization. By analysing the 1D flux power spectrum of these models, we find up to ~ 50% differences in the large-scale properties (low modes, k ≲ 0.01 s km -1) of the post-reionization power spectrum as a result of the thermal fluctuations. We showmore » that these differences could allow one to distinguish between different reionization scenarios with existing Lyα forest measurements. Finally, we explore the differences in the small-scale cut-off of the power spectrum, finding that, for the same heat input, models show very good agreement provided that the reionization redshift of the instantaneous reionization model occurs at the midpoint of the inhomogeneous model.« less

Authors:
ORCiD logo [1]; ORCiD logo [2];  [3];  [2];  [4]
  1. Univ. of Edinburgh (United Kingdom); Max-Planck-Inst. für Astronomie, Heidelberg (Germany)
  2. Max-Planck-Inst. für Astronomie, Heidelberg (Germany); Univ. of California, Santa Barbara, CA (United States)
  3. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
  4. Max-Planck-Inst. für Astronomie, Heidelberg (Germany)
Publication Date:
Research Org.:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Advanced Scientific Computing Research (ASCR) (SC-21)
OSTI Identifier:
1576506
Alternate Identifier(s):
OSTI ID: 1510831
Grant/Contract Number:  
AC02-05CH11231
Resource Type:
Accepted Manuscript
Journal Name:
Monthly Notices of the Royal Astronomical Society
Additional Journal Information:
Journal Volume: 486; Journal Issue: 3; Journal ID: ISSN 0035-8711
Publisher:
Royal Astronomical Society
Country of Publication:
United States
Language:
English
Subject:
79 ASTRONOMY AND ASTROPHYSICS; methods: numerical; intergalactic medium; dark ages; reionization; first stars; early Universe; large-scale structure of Universe

Citation Formats

Oñorbe, Jose, Davies, F. B., Lukić, Z., Hennawi, J. F., and Sorini, D. Inhomogeneous reionization models in cosmological hydrodynamical simulations. United States: N. p., 2019. Web. doi:10.1093/mnras/stz984.
Oñorbe, Jose, Davies, F. B., Lukić, Z., Hennawi, J. F., & Sorini, D. Inhomogeneous reionization models in cosmological hydrodynamical simulations. United States. doi:10.1093/mnras/stz984.
Oñorbe, Jose, Davies, F. B., Lukić, Z., Hennawi, J. F., and Sorini, D. Sat . "Inhomogeneous reionization models in cosmological hydrodynamical simulations". United States. doi:10.1093/mnras/stz984.
@article{osti_1576506,
title = {Inhomogeneous reionization models in cosmological hydrodynamical simulations},
author = {Oñorbe, Jose and Davies, F. B. and Lukić, Z. and Hennawi, J. F. and Sorini, D.},
abstractNote = {Here, we present a new hybrid method to simulate the thermal effects of reionization in cosmological hydrodynamical simulations. The method improves upon the standard approach used in simulations of the intergalactic medium (IGM) and galaxy formation without a significant increase in the computational cost, thereby allowing for efficient exploration of the parameter space. The method uses a small set of phenomenological input parameters, and combines a seminumerical reionization model to solve for the topology of reionization with an approximate model of how reionization heats the IGM, using the massively parallel Nyx hydrodynamics code which is specifically designed to solve for the structure of diffuse IGM gas. We have produced several medium-scale, high-resolution simulations (20483, Lbox = 40 Mpc h-1) with various instantaneous and inhomogeneous HI reionization models that use this new methodology. We study the IGM thermal properties of these models and find that large-scale temperature fluctuations extend well beyond the end of reionization. By analysing the 1D flux power spectrum of these models, we find up to ~ 50% differences in the large-scale properties (low modes, k ≲ 0.01 s km-1) of the post-reionization power spectrum as a result of the thermal fluctuations. We show that these differences could allow one to distinguish between different reionization scenarios with existing Lyα forest measurements. Finally, we explore the differences in the small-scale cut-off of the power spectrum, finding that, for the same heat input, models show very good agreement provided that the reionization redshift of the instantaneous reionization model occurs at the midpoint of the inhomogeneous model.},
doi = {10.1093/mnras/stz984},
journal = {Monthly Notices of the Royal Astronomical Society},
number = 3,
volume = 486,
place = {United States},
year = {2019},
month = {5}
}

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The impact of helium reionization on the structure of the intergalactic medium: Helium reionization impact on IGM structure
journal, May 2012


21cmfast: a fast, seminumerical simulation of the high-redshift 21-cm signal: 21cmfast
journal, November 2010


Quasar Proximity Zones and Patchy Reionization
journal, November 2007

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Constraining Reionization with the z ∼ 5–6 Ly α Forest Power Spectrum: The Outlook after Planck
journal, September 2017


Cosmic Reionization on Computers: Properties of the Post-reionization IGM
journal, May 2017

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Formation of Galaxies and Clusters of Galaxies by Self-Similar Gravitational Condensation
journal, February 1974

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CMB power spectrum parameter degeneracies in the era of precision cosmology
journal, April 2012

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Simulating cosmic reionization: how large a volume is large enough?
journal, January 2014

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A self-consistent 3D model of fluctuations in the helium-ionizing background
journal, November 2016

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The EAGLE project: simulating the evolution and assembly of galaxies and their environments
journal, November 2014

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The Physical State of Interstellar Hydrogen.
journal, March 1939

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Constraints on the Ionizing Efficiency of the First Galaxies
journal, October 2012

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The morphology of H II regions during reionization
journal, May 2007


Quasar ionization front Lyα emission in an inhomogeneous intergalactic medium
journal, February 2016

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Characterizing the Pressure Smoothing Scale of the Intergalactic Medium
journal, October 2015

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Simulating galaxy formation with the IllustrisTNG model
journal, October 2017

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An 800-million-solar-mass black hole in a significantly neutral Universe at a redshift of 7.5
journal, December 2017

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Fully Coupled Simulation of Cosmic Reionization. ii. Recombinations, Clumping Factors, and the Photon Budget for Reionization
journal, June 2014

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New measurements of the ionizing ultraviolet background over 2 < z < 5 and implications for hydrogen reionization
journal, October 2013

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Early galaxy formation and its large-scale effects
journal, December 2018


The Opacity of the Intergalactic Medium Measured along Quasar Sightlines at z ∼ 6
journal, August 2018

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The Growth of H ii Regions During Reionization
journal, September 2004

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Nyx: A MASSIVELY PARALLEL AMR CODE FOR COMPUTATIONAL COSMOLOGY
journal, February 2013


New synthesis models of consistent extragalactic background light over cosmic time
journal, January 2019

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