Diversity in density profiles of self-interacting dark matter satellite halos
We present results from N-body simulations of self-interacting dark matter (SIDM) subhalos, which could host ultra-faint dwarf spheroidal galaxies, inside a Milky-Way-like main halo. We find that high-concentration subhalos are driven to gravothermal core collapse, while low-concentration subhalos d...
| Main Authors: | , , , |
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| Other Authors: | |
| Format: | Article |
| Language: | English |
| Published: |
IOP Publishing,
2020-12-09T14:53:40Z.
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| Subjects: | |
| Online Access: | Get fulltext |
| Summary: | We present results from N-body simulations of self-interacting dark matter (SIDM) subhalos, which could host ultra-faint dwarf spheroidal galaxies, inside a Milky-Way-like main halo. We find that high-concentration subhalos are driven to gravothermal core collapse, while low-concentration subhalos develop large (kpc-sized) low-density cores, with both effects depending sensitively on the satellite's orbit and the self-interaction cross section over mass σ/m. The overall effect for σ/m ≳ 3 cm2/g is to increase the range of inner densities, potentially explaining the observed diversity of Milky Way satellites, which include compact systems like Draco and Segue 1 that are dense in dark matter, and less dense, diffuse systems like Sextans and Crater II . We discuss possible ways of distinguishing SIDM models from collisionless dark matter models using the inferred dark matter densities and stellar sizes of the dwarf spheroidal galaxies. ©2019 IOP Publishing Ltd and Sissa Medialab. Deutsche Forschungsgemeinschaft (DFG) through the Emmy Noether Grant (KA 4662/1-1) Office of High Energy Physics. DOE (DE-SC00012567) Office of High Energy Physics. DOE (DE-SC001399) NSF Grant (PHY-1620638) |
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