The cosmology dependence of the concentration–mass–redshift relation. Issue 2 (29th September 2022)

• Record Type: Journal Article
• Authors: López-Cano, Daniel; Angulo, Raúl E; Ludlow, Aaron D; Zennaro, M; Contreras, S; Chaves-Montero, Jonás; Aricò, G
• Is Part Of: Monthly notices of the Royal Astronomical Society. Volume 517:Issue 2(2022)
• Page Start: 2000
• Page End: 2011
• Publication Date: 2022-09-29
• Subjects: methods: numerical -- methods: statistical -- dark energy -- dark matter -- cosmology: theory; Astronomy -- Periodicals; Periodicals; 520.5
• DOI: 10.1093/mnras/stac2785
• Languages: English
• ISSNs: 0035-8711

Abstract

ABSTRACT: The concentrations of dark matter haloes provide crucial information about their internal structure and how it depends on mass and redshift – the so-called concentration–mass–redshift relation, denoted c ( M, z ). We present here an extensive study of the cosmology-dependence of c ( M, z ) that is based on a suite of 72 gravity-only, full N -body simulations in which the following cosmological parameters were varied: σ8, ΩM, Ωb, n s, h, M ν, w 0, and w a . We characterize the impact of these parameters on concentrations for different halo masses and redshifts. In agreement with previous works, and for all cosmologies studied, we find that there exists a tight correlation between the characteristic densities of dark matter haloes within their scale radii, r −2, and the critical density of the universe at a suitably defined formation time. This finding, when combined with excursion set modelling of halo formation histories, allows us to accurately predict the concentrations of dark matter haloes as a function of mass, redshift, and cosmology. We use our simulations to test the reliability of a number of published models for predicting halo concentration and highlight when they succeed or fail to reproduce the cosmological c ( M, z ) relation.