Galactic rotation curves versus ultralight dark matter: A systematic comparison with SPARC data

Abstract

We look for and place observational constraints on the imprint of ultralight dark matter (ULDM) soliton cores in rotation-dominated galaxies. Extending previous analyses, we find a conservative constraint which disfavors the soliton-host halo relation found in some numerical simulations over a broad range in the ULDM particle mass $m$. Combining the observational constraints with theoretical arguments for the efficiency of soliton formation via gravitational dynamical relaxation, and assuming that the soliton-halo relation is correct, our results disfavor ULDM from comprising 100\% of the total cosmological dark matter in the range $10^{-24}\mathrm{eV}\lesssim m\lesssim 10^{-20}\mathrm{eV}$. The constraints probe the ULDM fraction down to $f\lesssim 0.3$ of the total dark matter.

14 pages, 9 figures, matching the published version

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