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EDGE: Dark matter core creation depends on the timing of star formation
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Paper
EDGE: Dark matter core creation depends on the timing of star formation
2024
Overview
We study feedback-driven cold dark matter core creation in the EDGE suite of radiation-hydrodynamical dwarf galaxy simulations. Understanding this process is crucial when using observed dwarf galaxies to constrain the particle nature of dark matter. While previous studies have shown the stellar-mass to halo-mass ratio \\((M_{\\star} / M_{200})\\) determines the extent of core creation, we find that in low-mass dwarfs there is a crucial additional effect, namely the timing of star formation relative to reionisation. Sustained post-reionisation star formation decreases central dark matter density through potential fluctuations; conversely, pre-reionisation star formation is too short-lived to have such an effect. In fact, large stellar masses accrued prior to reionisation are a strong indicator of early collapse, and therefore indicative of an increased central dark matter density. We parameterise this differentiated effect by considering \\(M_{\\star,\\mathrm{post}}/M_{\\star,\\mathrm{pre}}\\), where the numerator and denominator represent the amount of star formation after and before \\(z\\sim6.5\\), respectively. Our study covers the halo mass range \\(10^9 < M_{200} < 10^{10} M_\\odot\\) (stellar masses between \\(10^4 < M_{\\star} < 10^8 M_\\odot\\)), spanning both ultra-faint and classical dwarfs. In this regime, \\(M_{\\star,\\mathrm{post}}/M_{\\star,\\mathrm{pre}}\\) correlates almost perfectly with the central dark matter density at \\(z=0\\), even when including simulations with a substantially different variant of feedback and cooling. We provide fitting formulae to describe the newfound dependence.
Publisher
Cornell University Library, arXiv.org
Subject
