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

Published online by Cambridge University Press:  30 October 2025

Yuka Kaneda Open the ORCID record for Yuka Kaneda [Opens in a new window] ,
Koki Otaki Open the ORCID record for Koki Otaki [Opens in a new window]  and
Masao Mori Open the ORCID record for Masao Mori [Opens in a new window]
Yuka Kaneda*
Affiliation:
Graduate School of Science and Technology, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki, 305-8577, Japan
Koki Otaki
Affiliation:
Graduate School of Science and Technology, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki, 305-8577, Japan
Masao Mori
Affiliation:
Center for Computational Science, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki, 305-8577, Japan
*
email: kaneda@ccs.tsukuba.ac.jp
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Abstract

Almost 30 years have passed since not only the universal density distribution of dark matter (DM) halos in cosmological N-body simulations, but also the scalings between properties of DM halos represented by concentration-mass (c-M) relations are proposed. We derive the c-M relation for sub galactic halos (subhalos) of Milky Way (MW)-sized host halo using the result of the ultra-high resolution cosmological N-body simulation, Phi-4096, with a particle mass of 5.13 × 103 h−1M⊙. This c-M relation is confirmed to be consistent with a c-M relation from near the free streaming scale to the galactic scale proposed in a literature. One of our main findings is that the c-M relation can reproduce observational properties of DM halos from dwarf galaxies to clusters of galaxies. In addition, we provide a testable prediction of the density distributions of MW subhalos for future observations.

Keywords

Galaxy Formationdark matterCosmological N-body simulation

Information

Type
Poster Paper
Information
Proceedings of the International Astronomical Union , Volume 19 , Symposium S379: Dynamical Masses of Local Group Galaxies , December 2023 , pp. 172 - 176
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Copyright
© The Author(s), 2025. Published by Cambridge University Press on behalf of International Astronomical Union

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