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The Dark Matter Density Profiles of Antlia B
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Journal Article
The Dark Matter Density Profiles of Antlia B
2023
Overview
We use spectroscopic observations of Antlia B, a distant ( d ∼ 1.35 Mpc) faint dwarf galaxy ( M V = −9.7, M * =10 5 M ⊙ ), from MUSE-Faint, to explore alternative dark matter (DM) models to Λ CDM, which are one possible explanation for the small-scale problems in the standard model. We measure line-of-sight velocities of 127 stars, and combine these with GravSphere, a Jeans modelling code, to place constraints on DM models and derive the first DM density profiles for this object. We present constraints on the nature of self-interacting DM, in which DM particles can interact with one another in the form of annihilation (we find a core radius of r c ≲ 69 pc) and on scalar field DM, comprised of ultralight bosons that form a Bose-Einstein Condensate (we find a characteristic length scale of the self-interaction of R TF ≲ 180 pc). These results suggest that we can rule out these models as an explanation for the cores in the larger dwarf galaxies in the Local Group.
Publisher
Cambridge University Press
Subject
