The Aemulus Project. II. Emulating the Halo Mass Function

Thomas McClintock, Eduardo Rozo, Matthew R. Becker, Joseph DeRose, Yao Yuan Mao, Sean McLaughlin, Jeremy L. Tinker, Risa H. Wechsler, Zhongxu Zhai

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

Existing models for the dependence of the halo mass function on cosmological parameters will become a limiting source of systematic uncertainty for cluster cosmology in the near future. We present a halo mass function emulator and demonstrate improved accuracy relative to state-of-the-art analytic models. In this work, mass is defined using an overdensity criteria of 200 relative to the mean background density. Our emulator is constructed from the Aemulus simulations, a suite of 40 N-body simulations with snapshots from z = 3 to z = 0. These simulations cover the flat wCDM parameter space allowed by recent cosmic microwave background, baryon acoustic oscillation and SNe Ia results, varying the parameters w, Ω m , Ω b , σ 8 , N eff , n s , and H 0 . We validate our emulator using five realizations of seven different cosmologies, for a total of 35 test simulations. These test simulations were not used in constructing the emulator, and were run with fully independent initial conditions. We use our test simulations to characterize the modeling uncertainty of the emulator, and introduce a novel way of marginalizing over the associated systematic uncertainty. We confirm nonuniversality in our halo mass function emulator as a function of both cosmological parameters and redshift. Our emulator achieves better than 1% precision over much of the relevant parameter space, and we demonstrate that the systematic uncertainty in our emulator will remain a negligible source of error for cluster abundance studies through at least the LSST Year 1 data set.

Original languageEnglish (US)
Article number53
JournalAstrophysical Journal
Volume872
Issue number1
DOIs
StatePublished - Feb 10 2019

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halos
simulation
cosmology
project
baryons
acoustics
oscillation
parameter
microwaves
oscillations
modeling
test

Keywords

  • large-scale structure of universe
  • methods: numerical
  • methods: statistical

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

McClintock, T., Rozo, E., Becker, M. R., DeRose, J., Mao, Y. Y., McLaughlin, S., ... Zhai, Z. (2019). The Aemulus Project. II. Emulating the Halo Mass Function. Astrophysical Journal, 872(1), [53]. https://doi.org/10.3847/1538-4357/aaf568

The Aemulus Project. II. Emulating the Halo Mass Function. / McClintock, Thomas; Rozo, Eduardo; Becker, Matthew R.; DeRose, Joseph; Mao, Yao Yuan; McLaughlin, Sean; Tinker, Jeremy L.; Wechsler, Risa H.; Zhai, Zhongxu.

In: Astrophysical Journal, Vol. 872, No. 1, 53, 10.02.2019.

Research output: Contribution to journalArticle

McClintock, T, Rozo, E, Becker, MR, DeRose, J, Mao, YY, McLaughlin, S, Tinker, JL, Wechsler, RH & Zhai, Z 2019, 'The Aemulus Project. II. Emulating the Halo Mass Function', Astrophysical Journal, vol. 872, no. 1, 53. https://doi.org/10.3847/1538-4357/aaf568
McClintock T, Rozo E, Becker MR, DeRose J, Mao YY, McLaughlin S et al. The Aemulus Project. II. Emulating the Halo Mass Function. Astrophysical Journal. 2019 Feb 10;872(1). 53. https://doi.org/10.3847/1538-4357/aaf568
McClintock, Thomas ; Rozo, Eduardo ; Becker, Matthew R. ; DeRose, Joseph ; Mao, Yao Yuan ; McLaughlin, Sean ; Tinker, Jeremy L. ; Wechsler, Risa H. ; Zhai, Zhongxu. / The Aemulus Project. II. Emulating the Halo Mass Function. In: Astrophysical Journal. 2019 ; Vol. 872, No. 1.
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