Dissipative dark matter on FIRE – I. Structural and kinematic properties of dwarf galaxies
Abstract
We present the first set of cosmological baryonic zoom-in simulations of galaxies including dissipative self-interacting dark matter (dSIDM). These simulations utilize the Feedback In Realistic Environments galaxy formation physics, but allow the dark matter to have dissipative self-interactions analogous to standard model forces, parametrized by the self-interaction cross-section per unit mass, (σ/m), and the dimensionless degree of dissipation, 0 < fdiss < 1. We survey this parameter space, including constant and velocity-dependent cross-sections, and focus on structural and kinematic properties of dwarf galaxies with $$M_{\rm halo} \sim 10^{10-11}{\, \rm M_\odot }$$ and $$M_{\ast } \sim 10^{5-8}{\, \rm M_\odot }$$. Central density profiles (parametrized as ρ ∝ rα) of simulated dwarfs become cuspy when $$(\sigma /m)_{\rm eff} \gtrsim 0.1\, {\rm cm^{2}\, g^{-1}}$$ (and fdiss = 0.5 as fiducial). The power-law slopes asymptote to α ≈ -1.5 in low-mass dwarfs independent of cross-section, which arises from a dark matter ‘cooling flow’. Through comparisons with dark matter only simulations, we find the profile in this regime is insensitive to the inclusion of baryons. However, when $$(\sigma /m)_{\rm eff} \ll 0.1\, {\rm cm^{2}\, g^{-1}}$$, baryonic effects can produce cored density profiles comparable to non-dissipative cold dark matter (CDM) runs but at smaller radii. Simulated galaxies with $$(\sigma /m) \gtrsim 10\, {\rm cm^{2}\, g^{-1}}$$ and the fiducial fdiss develop significant coherent rotation of dark matter, accompanied by halo deformation, but this is unlike the well-defined thin ‘dark discs’ often attributed to baryon-like dSIDM. The density profiles in this high cross-section model exhibit lower normalizations given the onset of halo deformation. For our surveyed dSIDM parameters, halo masses and galaxy stellar masses do not show appreciable difference from CDM, but dark matter kinematics and halo concentrations/shapes can differ.
- Authors:
-
[1];
[1];
[2];
[3];
[4];
[5]
- California Institute of Technology (CalTech), Pasadena, CA (United States). TAPIR
- California Institute of Technology (CalTech), Pasadena, CA (United States). Walter Burke Inst. for Theoretical Physics; Univ. of California, Irvine, CA (United States). Center for Cosmology. Dept. of Physics and Astronomy; Carnegie Observatories, Pasadena, CA (United States)
- California Institute of Technology (CalTech), Pasadena, CA (United States). TAPIR; Carnegie Observatories, Pasadena, CA (United States)
- Univ. of Texas, Austin, TX (United States). Dept. of Astronomy
- Univ. of California, Davis, CA (United States). Dept. of Physics and Astronomy
- Publication Date:
- Research Org.:
- California Institute of Technology (CalTech), Pasadena, CA (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC); National Science Foundation (NSF); National Aeronautics and Space Administration (NASA)
- OSTI Identifier:
- 1851492
- Grant/Contract Number:
- SC0011632; 1911233; 20009234; 1455342; 80NSSC18K0562; HST-AR-15800.001-A; GO-14734; AR-15057; AR-15809; 80NSSC18K1097; 80NSSC20K0513; AST-1752913; AST-1910346; NNX17AG29G; HSTAR-15006; HST-AR-15809; HST-GO-15658; HST-GO-15901; HSTGO-15902; HST-AR-16159; HST-GO-16226
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Monthly Notices of the Royal Astronomical Society
- Additional Journal Information:
- Journal Volume: 506; Journal Issue: 3; Journal ID: ISSN 0035-8711
- Publisher:
- Royal Astronomical Society
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 79 ASTRONOMY AND ASTROPHYSICS; astronomy & astrophysics; methods; numerical; galaxies; dwarf; haloes; dark matter; cosmology; theory
Citation Formats
Shen, Xuejian, Hopkins, Philip F., Necib, Lina, Jiang, Fangzhou, Boylan-Kolchin, Michael, and Wetzel, Andrew. Dissipative dark matter on FIRE – I. Structural and kinematic properties of dwarf galaxies. United States: N. p., 2021.
Web. doi:10.1093/mnras/stab2042.
Shen, Xuejian, Hopkins, Philip F., Necib, Lina, Jiang, Fangzhou, Boylan-Kolchin, Michael, & Wetzel, Andrew. Dissipative dark matter on FIRE – I. Structural and kinematic properties of dwarf galaxies. United States. https://doi.org/10.1093/mnras/stab2042
Shen, Xuejian, Hopkins, Philip F., Necib, Lina, Jiang, Fangzhou, Boylan-Kolchin, Michael, and Wetzel, Andrew. Mon .
"Dissipative dark matter on FIRE – I. Structural and kinematic properties of dwarf galaxies". United States. https://doi.org/10.1093/mnras/stab2042. https://www.osti.gov/servlets/purl/1851492.
@article{osti_1851492,
title = {Dissipative dark matter on FIRE – I. Structural and kinematic properties of dwarf galaxies},
author = {Shen, Xuejian and Hopkins, Philip F. and Necib, Lina and Jiang, Fangzhou and Boylan-Kolchin, Michael and Wetzel, Andrew},
abstractNote = {We present the first set of cosmological baryonic zoom-in simulations of galaxies including dissipative self-interacting dark matter (dSIDM). These simulations utilize the Feedback In Realistic Environments galaxy formation physics, but allow the dark matter to have dissipative self-interactions analogous to standard model forces, parametrized by the self-interaction cross-section per unit mass, (σ/m), and the dimensionless degree of dissipation, 0 < fdiss < 1. We survey this parameter space, including constant and velocity-dependent cross-sections, and focus on structural and kinematic properties of dwarf galaxies with $M_{\rm halo} \sim 10^{10-11}{\, \rm M_\odot }$ and $M_{\ast } \sim 10^{5-8}{\, \rm M_\odot }$. Central density profiles (parametrized as ρ ∝ rα) of simulated dwarfs become cuspy when $(\sigma /m)_{\rm eff} \gtrsim 0.1\, {\rm cm^{2}\, g^{-1}}$ (and fdiss = 0.5 as fiducial). The power-law slopes asymptote to α ≈ -1.5 in low-mass dwarfs independent of cross-section, which arises from a dark matter ‘cooling flow’. Through comparisons with dark matter only simulations, we find the profile in this regime is insensitive to the inclusion of baryons. However, when $(\sigma /m)_{\rm eff} \ll 0.1\, {\rm cm^{2}\, g^{-1}}$, baryonic effects can produce cored density profiles comparable to non-dissipative cold dark matter (CDM) runs but at smaller radii. Simulated galaxies with $(\sigma /m) \gtrsim 10\, {\rm cm^{2}\, g^{-1}}$ and the fiducial fdiss develop significant coherent rotation of dark matter, accompanied by halo deformation, but this is unlike the well-defined thin ‘dark discs’ often attributed to baryon-like dSIDM. The density profiles in this high cross-section model exhibit lower normalizations given the onset of halo deformation. For our surveyed dSIDM parameters, halo masses and galaxy stellar masses do not show appreciable difference from CDM, but dark matter kinematics and halo concentrations/shapes can differ.},
doi = {10.1093/mnras/stab2042},
journal = {Monthly Notices of the Royal Astronomical Society},
number = 3,
volume = 506,
place = {United States},
year = {Mon Jul 19 00:00:00 EDT 2021},
month = {Mon Jul 19 00:00:00 EDT 2021}
}
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Works referencing / citing this record:
SMBH seeds from dissipative dark matter
journal, July 2021
- Xiao, Huangyu; Shen, Xuejian; Hopkins, Philip F.
- Journal of Cosmology and Astroparticle Physics, Vol. 2021, Issue 07