Papers › Cosmology dependency of halo masses and concentrations in hydrodynamic simulations
Cosmology dependency of halo masses and concentrations in hydrodynamic simulations
Antonio Ragagnin, Alexandro Saro, Priyanka Singh, Klaus Dolag
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We employ a set of Magneticum cosmological hydrodynamic simulations that span over 15 different cosmologies, and extract masses and concentrations of all well-resolved haloes between z=0-1 for critical over-densities Δᵥᵢᵣ, Δ_(200c), Δ_(500c), Δ_(2500c) and mean overdensity Δ₂₀₀ₘ. We provide the first mass-concentration (Mc) relation and sparsity relation (i.e. M_(Δ1) - M_(Δ2) mass conversion) of hydrodynamic simulations that is modelled by mass, redshift and cosmological parameters Ωₘ, Ω_b, σ₈, h₀ as a tool for observational studies. We also quantify the impact that the Mc relation scatter and the assumption of NFW density profiles have on the uncertainty of the sparsity relation. We find that converting masses with the aid of a Mc relation carries an additional fractional scatter (≈4%) originated from deviations from the assumed NFW density profile. For this reason we provide a direct mass-mass conversion relation fit that depends on redshift and cosmological parameters. We release the package hydro_mc, a python tool that perform all kind of conversions presented in this paper.
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