Diversity in density profiles of self-interacting dark matter satellite halos
Abstract
We introduce findings 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.
- Authors:
-
- RWTH Aachen Univ. (Germany)
- Univ. of California, Irvine, CA (United States)
- Institute for Advanced Study, Princeton, NJ (United States). School of Natural Sciences; Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
- Publication Date:
- Research Org.:
- Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), High Energy Physics (HEP); National Science Foundation (NSF)
- OSTI Identifier:
- 1623311
- Grant/Contract Number:
- SC0012567; SC0013999; PHY-1620638
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Journal of Cosmology and Astroparticle Physics
- Additional Journal Information:
- Journal Volume: 2019; Journal Issue: 12; Journal ID: ISSN 1475-7516
- Publisher:
- Institute of Physics (IOP)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 79 ASTRONOMY AND ASTROPHYSICS; dark matter simulations; dwarfs galaxies
Citation Formats
Kahlhoefer, Felix, Kaplinghat, Manoj, Slatyer, Tracy R., and Wu, Chih-Liang. Diversity in density profiles of self-interacting dark matter satellite halos. United States: N. p., 2019.
Web. doi:10.1088/1475-7516/2019/12/010.
Kahlhoefer, Felix, Kaplinghat, Manoj, Slatyer, Tracy R., & Wu, Chih-Liang. Diversity in density profiles of self-interacting dark matter satellite halos. United States. https://doi.org/10.1088/1475-7516/2019/12/010
Kahlhoefer, Felix, Kaplinghat, Manoj, Slatyer, Tracy R., and Wu, Chih-Liang. Wed .
"Diversity in density profiles of self-interacting dark matter satellite halos". United States. https://doi.org/10.1088/1475-7516/2019/12/010. https://www.osti.gov/servlets/purl/1623311.
@article{osti_1623311,
title = {Diversity in density profiles of self-interacting dark matter satellite halos},
author = {Kahlhoefer, Felix and Kaplinghat, Manoj and Slatyer, Tracy R. and Wu, Chih-Liang},
abstractNote = {We introduce findings 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.},
doi = {10.1088/1475-7516/2019/12/010},
journal = {Journal of Cosmology and Astroparticle Physics},
number = 12,
volume = 2019,
place = {United States},
year = {2019},
month = {12}
}
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Too Big To Fail in Light of Gaia
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Works referencing / citing this record:
Finite-Size Dark Matter and its Effect on Small-Scale Structure
journal, January 2020
- Chu, Xiaoyong; Garcia-Cely, Camilo; Murayama, Hitoshi
- Physical Review Letters, Vol. 124, Issue 4
Astrophysical probes of inelastic dark matter with a light mediator
journal, February 2020
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Finite-Size Dark Matter and its Effect on Small-Scale Structure
text, January 2020
- Chu, Xiaoyong; Garcia Cely, Camilo; Murayama, Hitoshi
- Deutsches Elektronen-Synchrotron, DESY, Hamburg
Astrophysical probes of inelastic dark matter with a light mediator
text, January 2019
- Alvarez, Gerardo; Yu, Hai-Bo
- arXiv