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The mass accretion history of dark matter haloes down to Earth mass

Liu, Yizhou; Gao, Liang; Bose, Sownak; Frenk, Carlos S; Jenkins, Adrian; Springel, Volker; Wang, Jie; White, Simon D M; Zheng, Haonan

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Authors

Yizhou Liu

Liang Gao

Sownak Bose

Volker Springel

Jie Wang

Simon D M White

Haonan Zheng



Abstract

We take advantage of the unprecedented dynamical range provided by the ‘Cosmic-Zoom’ project to study the mass accretion history (MAH) of present-day dark matter haloes o v er the entire mass range present in the Lambda cold dark matter paradigm when the dark matter is made of weakly interacting massive particles of mass 100 GeV. In particular, we complement previous studies by exploring the MAHs of haloes with mass from 10 8 h −1 M down to Earth mass, 10 −6 h −1 M . The formation redshift of low-mass haloes anticorrelates weakly with mass, peaking at z = 3 for haloes of mass 10 −4 h −1 M . Even lower masses are affected by the free-streaming cut-off in the primordial spectrum of density fluctuations and form at lower redshift. We compare MAHs in our simulations with predictions from two analytical models based on the extended Press–Schechter theory (EPS), and three empirical models derived by fitting and extrapolating either results from cosmological N -body simulations or Monte Carlo realizations of halo growth. All models fit our simulations reasonably well o v er the mass range for which they were calibrated. While the empirical models match better for more massive haloes, M > 10 10 h −1 M , the analytical models do better when extrapolated down to Earth mass. At the higher masses, we explore the correlation between local environment density and MAH, finding that biases are relatively weak, with typical MAHs for haloes in extremely low-density and in typical regions differing by less than 20 per cent at high redshift. If this result can be extrapolated to lower halo masses, we conclude that EPS theory predicts the hierarchical build up of dark matter haloes quite well o v er the entire halo mass range.

Citation

Liu, Y., Gao, L., Bose, S., Frenk, C. S., Jenkins, A., Springel, V., …Zheng, H. (2023). The mass accretion history of dark matter haloes down to Earth mass. Monthly Notices of the Royal Astronomical Society, 527(4), 11740-11750. https://doi.org/10.1093/mnras/stae003

Journal Article Type Article
Acceptance Date Dec 20, 2023
Online Publication Date Jan 4, 2024
Publication Date Dec 23, 2023
Deposit Date Mar 1, 2024
Publicly Available Date Mar 1, 2024
Journal Monthly Notices of the Royal Astronomical Society
Print ISSN 0035-8711
Electronic ISSN 1365-2966
Publisher Royal Astronomical Society
Peer Reviewed Peer Reviewed
Volume 527
Issue 4
Pages 11740-11750
DOI https://doi.org/10.1093/mnras/stae003
Keywords Space and Planetary Science; Astronomy and Astrophysics
Public URL https://durham-repository.worktribe.com/output/2291556

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