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Title: The Borg Cube Simulation: Cosmological Hydrodynamics with CRK-SPH

Abstract

A challenging requirement posed by next-generation observations is a firm theoretical grasp of the impact of baryons on structure formation. Cosmological hydrodynamic simulations modeling gas physics are vital in this regard. A high degree of modeling flexibility exists in this space, making it important to explore a range of methods in order to gauge the accuracy of simulation predictions. We present results from the first cosmological simulation using Conservative Reproducing Kernel Smoothed Particle Hydrodynamics (CRK-SPH). We employ two simulations: one evolved purely under gravity, and the other with nonradiative hydrodynamics. Each contains 2 × 2304 3 cold dark matter plus baryon particles in an 800 h -1Mpc box. We compare statistics to previous nonradiative simulations including power spectra, mass functions, baryon fractions, and concentration. We find self-similar radial profiles of gas temperature, entropy, and pressure and show that a simple analytic model recovers these results to better than 40% over two orders of magnitude in mass. We quantify the level of nonthermal pressure support in halos and demonstrate that hydrostatic mass estimates are biased low by 24% (10%) for halos of mass 10 15 (10 13) h -1 M⊙. Here, we compute angular power spectra for the thermal and kinematicmore » Sunyaev–Zel’dovich effects and find good agreement with the low-ℓ Planck measurements. Finally, artificial scattering between particles of unequal mass is shown to have a large impact on the gravity-only run, and we highlight the importance of better understanding this issue in hydrodynamic applications. This is the first in a simulation campaign using CRK-SPH, with future work including subresolution gas treatments.« less

Authors:
ORCiD logo [1];  [2];  [3]; ORCiD logo [3];  [4];  [1];  [5]
  1. Argonne National Lab. (ANL), Lemont, IL (United States). ALCF Division
  2. Argonne National Lab. (ANL), Lemont, IL (United States). HEP Division; Univ. of Chicago, Chicago, IL (United States). Dept. of Physics
  3. Argonne National Lab. (ANL), Lemont, IL (United States). HEP Division; Argonne National Lab. (ANL), Lemont, IL (United States). MCS Division
  4. Argonne National Lab. (ANL), Lemont, IL (United States). HEP Division
  5. Argonne National Lab. (ANL), Lemont, IL (United States). CPS Division
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC); USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1542643
Grant/Contract Number:  
AC02-06CH11357
Resource Type:
Accepted Manuscript
Journal Name:
The Astrophysical Journal (Online)
Additional Journal Information:
Journal Name: The Astrophysical Journal (Online); Journal Volume: 877; Journal Issue: 2; Journal ID: ISSN 1538-4357
Publisher:
Institute of Physics (IOP)
Country of Publication:
United States
Language:
English
Subject:
79 ASTRONOMY AND ASTROPHYSICS; cosmology: theory; hydrodynamics; large-scale structure; methods: numerical

Citation Formats

Emberson, J. D., Frontiere, Nicholas, Habib, Salman, Heitmann, Katrin, Larsen, Patricia, Finkel, Hal, and Pope, Adrian. The Borg Cube Simulation: Cosmological Hydrodynamics with CRK-SPH. United States: N. p., 2019. Web. doi:10.3847/1538-4357/ab1b31.
Emberson, J. D., Frontiere, Nicholas, Habib, Salman, Heitmann, Katrin, Larsen, Patricia, Finkel, Hal, & Pope, Adrian. The Borg Cube Simulation: Cosmological Hydrodynamics with CRK-SPH. United States. doi:10.3847/1538-4357/ab1b31.
Emberson, J. D., Frontiere, Nicholas, Habib, Salman, Heitmann, Katrin, Larsen, Patricia, Finkel, Hal, and Pope, Adrian. Wed . "The Borg Cube Simulation: Cosmological Hydrodynamics with CRK-SPH". United States. doi:10.3847/1538-4357/ab1b31.
@article{osti_1542643,
title = {The Borg Cube Simulation: Cosmological Hydrodynamics with CRK-SPH},
author = {Emberson, J. D. and Frontiere, Nicholas and Habib, Salman and Heitmann, Katrin and Larsen, Patricia and Finkel, Hal and Pope, Adrian},
abstractNote = {A challenging requirement posed by next-generation observations is a firm theoretical grasp of the impact of baryons on structure formation. Cosmological hydrodynamic simulations modeling gas physics are vital in this regard. A high degree of modeling flexibility exists in this space, making it important to explore a range of methods in order to gauge the accuracy of simulation predictions. We present results from the first cosmological simulation using Conservative Reproducing Kernel Smoothed Particle Hydrodynamics (CRK-SPH). We employ two simulations: one evolved purely under gravity, and the other with nonradiative hydrodynamics. Each contains 2 × 23043 cold dark matter plus baryon particles in an 800 h-1Mpc box. We compare statistics to previous nonradiative simulations including power spectra, mass functions, baryon fractions, and concentration. We find self-similar radial profiles of gas temperature, entropy, and pressure and show that a simple analytic model recovers these results to better than 40% over two orders of magnitude in mass. We quantify the level of nonthermal pressure support in halos and demonstrate that hydrostatic mass estimates are biased low by 24% (10%) for halos of mass 1015 (1013) h-1 M⊙. Here, we compute angular power spectra for the thermal and kinematic Sunyaev–Zel’dovich effects and find good agreement with the low-ℓ Planck measurements. Finally, artificial scattering between particles of unequal mass is shown to have a large impact on the gravity-only run, and we highlight the importance of better understanding this issue in hydrodynamic applications. This is the first in a simulation campaign using CRK-SPH, with future work including subresolution gas treatments.},
doi = {10.3847/1538-4357/ab1b31},
journal = {The Astrophysical Journal (Online)},
number = 2,
volume = 877,
place = {United States},
year = {2019},
month = {5}
}

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