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Shapes of Milky-Way-Mass Galaxies with Self-Interacting Dark Matter

Vargya, Drona and Sanderson, Robyn and Sameie, Omid and Boylan-Kolchin, Michael and Hopkins, Philip F. and Wetzel, Andrew and Graus, Andrew (2021) Shapes of Milky-Way-Mass Galaxies with Self-Interacting Dark Matter. . (Unpublished) https://resolver.caltech.edu/CaltechAUTHORS:20220228-183235199

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Abstract

Self-interacting dark matter (SIDM) models offer one way to reconcile inconsistencies between observations and predictions from collisionless cold dark matter (CDM) models on dwarf-galaxy scales. In order to incorporate the effects of both baryonic and SIDM interactions, we study a suite of cosmological-baryonic simulations of Milky-Way (MW)-mass galaxies from the Feedback in Realistic Environments (FIRE-2) project where we vary the SIDM self-interaction cross-section σ/m. We compare the shape of the main dark matter (DM) halo at redshift z = 0 predicted by SIDM simulations (at σ/m = 0.1, 1, and 10 cm² g⁻¹) with CDM simulations using the same initial conditions. In the presence of baryonic feedback effects, we find that SIDM models do not produce the large differences in the inner structure of MW-mass galaxies predicted by SIDM-only models. However, we do find that the radius where the shape of the total mass distribution begins to differ from that of the stellar mass distribution is dependent on σ/m. This transition could potentially be used to set limits on the SIDM cross-section in the MW.


Item Type:Report or Paper (Discussion Paper)
Related URLs:
URLURL TypeDescription
http://arxiv.org/abs/2104.14069arXivDiscussion Paper
ORCID:
AuthorORCID
Sanderson, Robyn0000-0003-3939-3297
Sameie, Omid0000-0003-4394-6085
Boylan-Kolchin, Michael0000-0002-9604-343X
Hopkins, Philip F.0000-0003-3729-1684
Wetzel, Andrew0000-0003-0603-8942
Additional Information:Attribution 4.0 International (CC BY 4.0). RES acknowledges support from NASA grant 19-ATP19-0068 and HST-AR-15809 from the Space Telescope Science Institute (STScI), which is operated by AURA, Inc., under NASA contract NAS5-26555. MBK acknowledges support from NSF CAREER award AST-1752913, NSF grant AST-1910346, NASA grant NNX17AG29G, and HST-AR-15006, HST-AR-15809, HST-GO-15658, HST-GO-15901, and HST-GO-15902 from STScI. AW received support from NASA through ATP grants 80NSSC18K1097 and 80NSSC20K0513; HST grants GO-14734, AR-15057, AR-15809, and GO-15902 from STScI; a Scialog Award from the Heising-Simons Foundation; and a Hellman Fellowship. ASG is supported by the Harlan J. Smith postdoctoral fellowship. This research is part of the Frontera computing project at the Texas Advanced Computing Center (TACC). Frontera is made possible by National Science Foundation award OAC-1818253. Simulations in this project were run using Early Science Allocation 1923870, and analysed using computing resources supported by the Scientific Computing Core at the Flatiron Institute. This work used additional computational resources of the University of Texas at Austin and TACC, the NASA Advanced Supercomputing (NAS) Division and the NASA Center for Climate Simulation (NCCS), and the Extreme Science and Engineering Discovery Environment (XSEDE), which is supported by National Science Foundation grant number OCI-1053575. DATA AVAILABILITY. The simulations used for this study are currently proprietary to members of the FIRE collaboration. Please contact the authors if interested.
Group:Astronomy Department, TAPIR
Funders:
Funding AgencyGrant Number
NASA19-ATP19-0068
NASAHST-AR-15809
NASANAS5-26555
NSFAST-1752913
NSFAST-1910346
NASANNX17AG29G
NASAHST-AR-15006
NASAHST-AR-15809
NASAHST-GO-15658
NASAHST-GO-15901
NASAHST-GO-15902
NASA80NSSC18K1097
NASA80NSSC20K0513
NASAHST-GO-14734
NASAHST-AR-15057
NASAHST-AR-15809
NASAHST-GO-15902
Heising-Simons FoundationScialog Award
Hellman FellowshipUNSPECIFIED
Harlan J. Smith McDonald ObservatoryUNSPECIFIED
NSFOAC-1818253
NSFOCI-1053575
Subject Keywords:dark matter – methods: numerical – galaxies: structure – galaxies: haloes
Record Number:CaltechAUTHORS:20220228-183235199
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20220228-183235199
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:113640
Collection:CaltechAUTHORS
Deposited By: George Porter
Deposited On:01 Mar 2022 21:13
Last Modified:01 Mar 2022 21:13

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