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The robustness of cosmological hydrodynamic simulation predictions to changes in numerics and cooling physics

Huang, Shuiyao and Katz, Neal and Davé, Romeel and Fardal, Mark and Kollmeier, Juna and Oppenheimer, Benjamin D. and Peeples, Molly S. and Roberts, Shawn and Weinberg, David H. and Hopkins, Philip F. and Thompson, Robert (2019) The robustness of cosmological hydrodynamic simulation predictions to changes in numerics and cooling physics. Monthly Notices of the Royal Astronomical Society, 484 (2). pp. 2021-2046. ISSN 0035-8711. doi:10.1093/mnras/stz057.

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We test and improve the numerical schemes in our smoothed particle hydrodynamics (SPH) code for cosmological simulations, including the pressure–entropy formulation (PESPH), a time-dependent artificial viscosity, a refined time-step criterion, and metal-line cooling that accounts for photoionization in the presence of a recently refined Haardt & Madau model of the ionizing background. The PESPH algorithm effectively removes the artificial surface tension present in the traditional SPH formulation, and in our test simulations, it produces better qualitative agreement with mesh-code results for Kelvin–Helmholtz instability and cold cloud disruption. Using a set of cosmological simulations, we examine many of the quantities we have studied in previous work. Results for galaxy stellar and H I mass functions, star formation histories, galaxy scaling relations, and statistics of the Lyα forest are robust to the changes in numerics and microphysics. As in our previous simulations, cold gas accretion dominates the growth of high-redshift galaxies and of low-mass galaxies at low redshift, and recycling of winds dominates the growth of massive galaxies at low redshift. However, the PESPH simulation removes spurious cold clumps seen in our earlier simulations, and the accretion rate of hot gas increases by up to an order of magnitude at some redshifts. The new numerical model also influences the distribution of metals among gas phases, leading to considerable differences in the statistics of some metal absorption lines, most notably Ne VIII.

Item Type:Article
Related URLs:
URLURL TypeDescription Paper
Huang, Shuiyao0000-0002-6571-0738
Katz, Neal0000-0002-3097-5381
Davé, Romeel0000-0003-2842-9434
Kollmeier, Juna0000-0001-9852-1610
Oppenheimer, Benjamin D.0000-0003-4754-6863
Peeples, Molly S.0000-0003-1455-8788
Hopkins, Philip F.0000-0003-3729-1684
Additional Information:© 2019 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society. This article is published and distributed under the terms of the Oxford University Press, Standard Journals Publication Model ( Accepted 2018 December 20. Received 2018 December 10; in original form 2018 October 29. We thank the anonymous referee for useful comments. We thank Amanda Ford for sharing her analysis code for generating mock QSO lines, and Volker Springel for providing the GADGET-3 code. We have used SPLASH (Price 2007) for visualization. We acknowledge support by NSF grant AST-1517503, NASA ATP grant 80NSSC18K1016, and HST Theory grant HST-AR-14299. DW acknowledges support of NSF grant AST-1516997.
Group:TAPIR, Astronomy Department
Funding AgencyGrant Number
Subject Keywords:hydrodynamics, methods: numerical, galaxies: evolution, galaxies: general
Issue or Number:2
Record Number:CaltechAUTHORS:20190207-163502830
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Official Citation:Shuiyao Huang, Neal Katz, Romeel Davé, Mark Fardal, Juna Kollmeier, Benjamin D Oppenheimer, Molly S Peeples, Shawn Roberts, David H Weinberg, Philip F Hopkins, Robert Thompson; The robustness of cosmological hydrodynamic simulation predictions to changes in numerics and cooling physics, Monthly Notices of the Royal Astronomical Society, Volume 484, Issue 2, 1 April 2019, Pages 2021–2046,
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:92777
Deposited By: George Porter
Deposited On:08 Feb 2019 15:25
Last Modified:05 Jul 2022 18:53

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