REIONIZATION ON LARGE SCALES. I. A PARAMETRIC MODEL CONSTRUCTED FROM RADIATION-HYDRODYNAMIC SIMULATIONS

Battaglia, N.; Trac, H.; Cen, R.; Loeb, A.

doi:10.1088/0004-637X/776/2/81

Title: REIONIZATION ON LARGE SCALES. I. A PARAMETRIC MODEL CONSTRUCTED FROM RADIATION-HYDRODYNAMIC SIMULATIONS

Full Record
Other Related Research

Abstract

We present a new method for modeling inhomogeneous cosmic reionization on large scales. Utilizing high-resolution radiation-hydrodynamic simulations with 2048{sup 3} dark matter particles, 2048{sup 3} gas cells, and 17 billion adaptive rays in a L = 100 Mpc h {sup –1} box, we show that the density and reionization redshift fields are highly correlated on large scales (∼> 1 Mpc h {sup –1}). This correlation can be statistically represented by a scale-dependent linear bias. We construct a parametric function for the bias, which is then used to filter any large-scale density field to derive the corresponding spatially varying reionization redshift field. The parametric model has three free parameters that can be reduced to one free parameter when we fit the two bias parameters to simulation results. We can differentiate degenerate combinations of the bias parameters by combining results for the global ionization histories and correlation length between ionized regions. Unlike previous semi-analytic models, the evolution of the reionization redshift field in our model is directly compared cell by cell against simulations and performs well in all tests. Our model maps the high-resolution, intermediate-volume radiation-hydrodynamic simulations onto lower-resolution, larger-volume N-body simulations (∼> 2 Gpc h {sup –1}) in order to makemore »« less

Authors:

Battaglia, N.; Trac, H. ^[1]; Cen, R. ^[2]; Loeb, A. ^[3]

McWilliams Center for Cosmology, Wean Hall, Carnegie Mellon University, 5000 Forbes Avenue, Pittsburgh PA 15213 (United States)
Department of Astrophysical Sciences, Princeton University, Princeton, NJ 08544 (United States)
Harvard-Smithsonian Center for Astrophysics, Cambridge, MA 02138 (United States)

Publication Date:: Sun Oct 20 00:00:00 EDT 2013

OSTI Identifier:: 22270765

Resource Type:: Journal Article

Journal Name:: Astrophysical Journal

Additional Journal Information:: Journal Volume: 776; Journal Issue: 2; Other Information: Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0004-637X

Country of Publication:: United States

Language:: English

Subject:: 79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ASTRONOMY; ASTROPHYSICS; COMPARATIVE EVALUATIONS; COMPUTERIZED SIMULATION; CORRELATIONS; COSMOLOGY; DENSITY; HYDRODYNAMICS; IONIZATION; NONLUMINOUS MATTER; RED SHIFT; RESOLUTION; UNIVERSE

Citation Formats


                    Battaglia, N., Trac, H., Cen, R., and Loeb, A. REIONIZATION ON LARGE SCALES. I. A PARAMETRIC MODEL CONSTRUCTED FROM RADIATION-HYDRODYNAMIC SIMULATIONS.  United States: N. p., 2013. 
        Web.  doi:10.1088/0004-637X/776/2/81.

Copy to clipboard


                    Battaglia, N., Trac, H., Cen, R., & Loeb, A. REIONIZATION ON LARGE SCALES. I. A PARAMETRIC MODEL CONSTRUCTED FROM RADIATION-HYDRODYNAMIC SIMULATIONS.  United States.  https://doi.org/10.1088/0004-637X/776/2/81

Copy to clipboard


                    Battaglia, N., Trac, H., Cen, R., and Loeb, A. 2013.  
        "REIONIZATION ON LARGE SCALES. I. A PARAMETRIC MODEL CONSTRUCTED FROM RADIATION-HYDRODYNAMIC SIMULATIONS".  United States.  https://doi.org/10.1088/0004-637X/776/2/81.

Copy to clipboard


                    
@article{osti_22270765,

  title        = {REIONIZATION ON LARGE SCALES. I. A PARAMETRIC MODEL CONSTRUCTED FROM RADIATION-HYDRODYNAMIC SIMULATIONS},

  author       = {Battaglia, N. and Trac, H. and Cen, R. and Loeb, A.},

  abstractNote = {We present a new method for modeling inhomogeneous cosmic reionization on large scales. Utilizing high-resolution radiation-hydrodynamic simulations with 2048{sup 3} dark matter particles, 2048{sup 3} gas cells, and 17 billion adaptive rays in a L = 100 Mpc h {sup –1} box, we show that the density and reionization redshift fields are highly correlated on large scales (∼> 1 Mpc h {sup –1}). This correlation can be statistically represented by a scale-dependent linear bias. We construct a parametric function for the bias, which is then used to filter any large-scale density field to derive the corresponding spatially varying reionization redshift field. The parametric model has three free parameters that can be reduced to one free parameter when we fit the two bias parameters to simulation results. We can differentiate degenerate combinations of the bias parameters by combining results for the global ionization histories and correlation length between ionized regions. Unlike previous semi-analytic models, the evolution of the reionization redshift field in our model is directly compared cell by cell against simulations and performs well in all tests. Our model maps the high-resolution, intermediate-volume radiation-hydrodynamic simulations onto lower-resolution, larger-volume N-body simulations (∼> 2 Gpc h {sup –1}) in order to make mock observations and theoretical predictions.},

  doi          = {10.1088/0004-637X/776/2/81},

  url          = {https://www.osti.gov/biblio/22270765},
  journal      = {Astrophysical Journal},

  issn         = {0004-637X},

  number       = 2,

  volume       = 776,

  place        = {United States},

  year         = {Sun Oct 20 00:00:00 EDT 2013},

  month        = {Sun Oct 20 00:00:00 EDT 2013}

}

Copy to clipboard

Journal Article:

https://doi.org/10.1088/0004-637X/776/2/81

Other availability

Find in Google Scholar

Search WorldCat to find libraries that may hold this journal

Save / Share:

Export Metadata

Save to My Library

Similar records in OSTI.GOV collections:

Inhomogeneous reionization models in cosmological hydrodynamical simulations

Journal Article Oñorbe, Jose; Davies, F.; Lukić, Z.; ... - Monthly Notices of the Royal Astronomical Society

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 formore »« less
Cited by 27
https://doi.org/10.1093/mnras/stz984
The cross-correlation between 21 cm intensity mapping maps and the Lyα forest in the post-reionization era

Journal Article Carucci, Isabella; Villaescusa-Navarro, Francisco; Viel, Matteo - Journal of Cosmology and Astroparticle Physics

We investigate the cross-correlation signal between 21cm intensity mapping maps and the Lyα forest in the fully non-linear regime using state-of-the-art hydrodynamic simulations. The cross-correlation signal between the Lyα forest and 21cm maps can provide a coherent and comprehensive picture of the neutral hydrogen (HI) content of our Universe in the post-reionization era, probing both its mass content and volume distribution. We compute the auto-power spectra of both fields together with their cross-power spectrum at z = 2.4 and find that on large scales the fields are completely anti-correlated. This anti-correlation arises because regions with high (low) 21cm emission, suchmore »« less
https://doi.org/10.1088/1475-7516/2017/04/001
Optical depth to reionization from perturbative 21 cm clustering

Journal Article Sailer, Noah; Chen, Shi-Fan; White, Martin - Journal of Cosmology and Astroparticle Physics

The optical depth τ is the least well determined parameter in the standard model of cosmology, and one whose precise value is important for both understanding reionization and for inferring fundamental physics from cosmological measurements. Here, we forecast how well future epoch of reionization experiments could constraint τ using a symmetries-based bias expansion that highlights the special role played by anisotropies in the power spectrum on large scales. Given a parametric model for the ionization evolution inspired by the physical behavior of more detailed reionization simulations, we find that future 21 cm experiments could place tight constraints on the timingmore »« less
https://doi.org/10.1088/1475-7516/2022/10/007

Full Text Available
The Inhomogeneous Reionization Times of Present-day Galaxies

Journal Article Aubert, Dominique; Deparis, Nicolas; Ocvirk, Pierre; ... - The Astrophysical Journal. Letters (Online)

Today's galaxies experienced cosmic reionization at different times in different locations. For the first time, reionization (50% ionized) redshifts, z _R , at the location of their progenitors are derived from new, fully coupled radiation-hydrodynamics simulation of galaxy formation and reionization at z > 6, matched to N-body simulation to z = 0. Constrained initial conditions were chosen to form the well-known structures of the local universe, including the Local Group and Virgo, in a (91 Mpc)³ volume large enough to model both global and local reionization. Reionization simulation CoDa I-AMR, by CPU-GPU code EMMA, used (2048)³ particles and (2048)³more »« less
Cited by 28
https://doi.org/10.3847/2041-8213/aab14d

Full Text Available
CONNECTING REIONIZATION TO THE LOCAL UNIVERSE

Journal Article Alvarez, Marcelo; Busha, Michael; Abel, Tom - Astrophysical Journal (Online)

We present results of combined N-body and three-dimensional reionization calculations to determine the relationship between reionization history and local environment in a volume of 1 Gpc h {sup -1} across and a resolution of about 1 Mpc. We achieve this by applying three-dimensional simulations of reionization, based on the extended Press-Schechter formalism, to the same initial conditions as the N-body simulations. We resolve about 2 x 10{sup 6} halos of mass greater than {approx}10{sup 12} M {sub sun} at z = 0, and determine the relationship between halo mass and reionization epoch for galaxies and clusters. For our fiducial reionizationmore »« less
https://doi.org/10.1088/0004-637X/703/2/L167

Similar Records