A Self-interacting Dark Matter Solution to the Extreme Diversity of Low-mass Halo Properties

Nadler, Ethan O.; Yang, Daneng; Yu, Hai-Bo

doi:10.3847/2041-8213/ad0e09

Title: A Self-interacting Dark Matter Solution to the Extreme Diversity of Low-mass Halo Properties

Journal Article · 30 November 2023 · The Astrophysical Journal. Letters

DOI: https://doi.org/10.3847/2041-8213/ad0e09 · OSTI ID:2222957

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Abstract The properties of low-mass dark matter (DM) halos appear to be remarkably diverse relative to cold, collisionless DM predictions, even in the presence of baryons. We show that self-interacting DM (SIDM) can simultaneously explain observations of halo diversity at two opposite extremes—the inner density profile of the dense substructure perturbing the strong lens galaxy SDSSJ0946+1006 and the rotation curves of isolated, gas-rich ultradiffuse galaxies (UDGs). To achieve this, we present the first cosmological zoom-in simulation featuring strong DM self-interactions in a galaxy group environment centered on a 10 ¹³ M _⊙ host halo. In our SIDM simulation, most surviving subhalos of the group-mass host are deeply core-collapsed, yielding excellent candidates for the observed dense strong-lens perturber. Self-interactions simultaneously create kiloparsec-scale cores in low-concentration isolated halos, which could host the observed UDGs. Our scenario can be further tested with observations of DM structure and galaxies over a wide mass range.

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Sponsoring Organization:: USDOE

Grant/Contract Number:: de-sc0008541

OSTI ID:: 2222957

Journal Information:: The Astrophysical Journal. Letters, Journal Name: The Astrophysical Journal. Letters Vol. 958 Journal Issue: 2; ISSN 2041-8205

Publisher:: American Astronomical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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