Pushing down the low-mass halo concentration frontier with the Lomonosov cosmological simulations

Abstract

We introduce the Lomonosov suite of high-resolution N-body cosmological simulations covering a full box of size 32 $h^{-1}$ Mpc with low-mass resolution particles ($2\times 10^7$ $h^{-1}{M}_{\odot }$) and three zoom-in simulations of overdense, underdense and mean density regions at much higher particle resolution ($4\times 10^4$ $h^{-1}{M}_{\odot }$). The main purpose of this simulation suite is to extend the concentration-mass relation of dark matter halos down to masses below those typically available in large cosmological simulations. The three different density regions available at higher resolution provide a better understanding of the effect of the local environment on halo concentration, known to be potentially important for small simulation boxes and small halo masses. Yet, we find the correction to be small in comparison with the scatter of halo concentrations. We conclude that zoom simulations, despite their limited representativity of the volume of the Universe, can be effectively used for the measurement of halo concentrations at least at the halo masses probed by our simulations. In any case, after a precise characterization of this effect, we develop a robust technique to extrapolate the concentration values found in zoom simulations to larger volumes with greater accuracy. All together, Lomonosov provides a measure of the concentration-mass relation in the halo mass range $10^7-10^{10}$ $h^{-1}{M}_{\odot }$ with superb halo statistics. This work represents a first important step to measure halo concentrations at intermediate, yet vastly unexplored halo mass scales, down to the smallest ones. All Lomonosov data and files are public for community's use.

11 pages, accepted by MNRAS

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• The Uchuu Simulations: Data Release 1 and Dark Matter Halo Concentrations
• Self-Interacting Dark Matter Subhalos in the Milky Way's Tides
• Halo Substructure Boosts to the Signatures of Dark Matter Annihilation
• The Abundance and Structure of Subhaloes near the Free Streaming Scale and Their Impact on Indirect Dark Matter Searches
• Constraining self-interacting dark matter with scaling laws of observed halo surface densities
• Predicted future fate of COSMOS galaxy protoclusters over 11 Gyr with constrained simulations
• Major mergers between dark matter haloes -- II. Profile and concentration changes
• The nature of core formation in dark matter haloes: adiabatic or impulsive?
• On the origin of the gamma-ray emission from Omega Centauri: Milisecond pulsars and dark matter annihilation
• Searching for dark matter annihilation from individual halos: uncertainties, scatter and signal-to-noise ratios
• Impact of ultraluminous X-ray sources on photoabsorption in the first galaxies
• Hermeian haloes: extreme objects with two interactions in the past
• Impact of baryons on the population of Galactic subhalos and implications for dark matter searches