Masao Mori, Astrophysics, University of Tsukuba
Theoretical Astrophysics and Computational Physics

Dark matter haloes · 2025 · Conference contribution

How does the concentration–mass relation connect subhaloes to observed halo scaling laws?

A high-resolution cosmological simulation probes the concentration–mass relation for subhaloes around Milky Way-sized hosts.

c-M relation of the sub-galactic dark matter halos and the effect of the cusp-to-core transition

c-M relation of the sub-galactic dark matter halos and the effect of the cusp-to-core transition. Kaneda, Yuka; Otaki, Koki; Mori, Masao, "Dynamical Masses of Local Group Galaxies", Proceedings of the International Astronomical Union, 379, 172-176 (2025).

Approach

The Phi-4096 N-body simulation is used to measure subhalo concentrations and masses and compare their relation with established cold-dark-matter predictions.

Main result

The inferred relation agrees with a previously proposed relation spanning very small to galactic scales. The study connects it with observed halo properties from dwarf galaxies to clusters.

Scientific implications

The concentration–mass framework gives testable predictions for the density structure of Milky Way subhaloes and context for cusp-to-core transformations.

Scope and limitations

This is an IAU symposium poster paper. Its predictions concern simulated halo structure and require observational tests.

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