Diversity in density profiles of self-interacting dark matter satellite halos
Name
1904.10539.pdf
Description
Submitted version
Size
857.44 KB
Format
Adobe PDF
Checksum (MD5)
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Author(s)
Kahlhoefer, Felix
Kaplinghat, Manoj
Slatyer, Tracy Robyn
Wu, Chih-Liang
Date Issued
December 2019
Journal
Journal of Cosmology and Astroparticle Physics
Publisher
IOP Publishing
Citation
Kahlhoefer, Felix et al., "Diversity in density profiles of self-interacting dark matter satellite halos." Journal of Cosmology and Astroparticle Physics 2019, 12 (December 2019): 010 ©2019 Authors
Version
Original manuscript
Abstract
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.
MIT Department
Massachusetts Institute of Technology. Center for Theoretical Physics
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Creative Commons Attribution-Noncommercial-Share Alike
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DOI of Published Version
https://doi.org/10.1088/1475-7516/2019/12/010
