An SIDM Solution to the Extreme Diversity of Low-mass Halo Properties
| Autor: | Nadler, Ethan O., Yang, Daneng, Yu, Hai-Bo |
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| Jazyk: | angličtina |
| Rok vydání: | 2023 |
| Předmět: | |
| Popis: | The properties of low-mass dark matter halos appear to be remarkably diverse relative to predictions of cold, collisionless dark matter, even in the presence of baryons. We show that self-interacting dark matter can simultaneously explain two extreme measurements of halo diversity in different directions -- namely, the rotation curves of low-concentration halos associated with gas-rich ultra-diffuse galaxies in the field and the inner density profile of the dense substructure perturbing the strong lens galaxy SDSSJ0946+1006. We present the first cosmological zoom-in simulation featuring strong dark matter self-interactions in a galaxy group environment centered on a $10^{13}~M_{\mathrm{\odot}}$ host halo. These interactions produce kiloparsec-scale cores in low-concentration isolated halos, which could host the ultra-diffuse galaxies, while most surviving subhalos of the group-mass host are deeply core-collapsed, yielding excellent candidates for the observed dense strong-lens perturber. Our scenario can be further tested with observations of galactic systems over a wide mass range. 10 pages, 6 figures |
| Databáze: | OpenAIRE |
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