Unraveling the interplay between SIDM and baryons in MW halos: defining where baryons dictate heat transfer

Abstract

We present a new set of cosmological zoom-in simulations of a MW-like galaxy which for the first time include elastic velocity-dependent self interacting dark matter (SIDM) and IllustrisTNG physics. With these simulations we investigate the interaction between SIDM and baryons and its effects on the galaxy evolution process. We also introduce a novel set of modified DMO simulations which can reasonably replicate the effects of fully realized hydrodynamics on the DM halo while simplifying the analysis and lowering the computational cost. We find that baryons change the thermal structure of the central region of the halo to a greater extent than the SIDM scatterings for MW-like galaxies. Additionally, we find that the new thermal structure of the MW-like halo causes SIDM to create cuspier central densities rather than cores because the SIDM scatterings remove the thermal support by transferring heat away from the center of the galaxy. We find that this effect, caused by baryon contraction, begins to affect galaxies with a stellar mass of $10^8$ M${}_{\odot }$ and increases in strength to the MW-mass scale. This implies that any simulations used to constrain the SIDM cross sections for galaxies with stellar masses between $10^8$ and at least $10^{11}$ M${}_{\odot }$ will require baryons to make accurate predictions.

14 pages, 11 figures

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• Endothermic self-interacting dark matter in Milky Way-like dark matter haloes
• Cosmological and idealized simulations of dark matter haloes with velocity-dependent, rare and frequent self-interactions
• Introducing the AIDA-TNG project: galaxy formation in alternative dark matter models
• Testing the parametric model for self-interacting dark matter using matched halos in cosmological simulations
• SIDM Concerto: Compilation and Data Release of Self-interacting Dark Matter Zoom-in Simulations
• Exploring Self-Interacting Dark Matter Halos with Diverse Baryonic Distributions: A Parametric Approach
• SASHIMI-SIDM: Semi-analytical subhalo modelling for self-interacting dark matter at sub-galactic scales
• The local dark matter distribution in self-interacting dark matter halos
• A MARVEL-ous study of how well galaxy shapes reflect Dark Matter halo shapes in Cold Dark Matter Simulations
• COZMIC. III. Cosmological Zoom-in Simulations of Self-interacting Dark Matter with Suppressed Initial Conditions
• The AIDA-TNG project: dark matter profiles and concentrations in alternative dark matter models
• How Many Bursts Does it Take to Form a Core at the Center of a Galaxy?
• Structure Formation under Inelastic Two-Component Dark Matter: Halo Statistics and Matter Power Spectra in the High-$z$ Universe