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We look for and place observational constraints on the imprint of ultralightdark matter (ULDM) soliton cores in rotation-dominated galaxies. Extendingprevious analyses, we find a conservative constraint which disfavors thesoliton-host halo relation found in some numerical simulations over a broadrange in the ULDM particle mass $m$. Combining the observational constraintswith theoretical arguments for the efficiency of soliton formation viagravitational dynamical relaxation, and assuming that the soliton-halo relationis correct, our results disfavor ULDM from comprising 100\% of the totalcosmological dark matter in the range $10^{-24}~{\rm eV}\lesssimm\lesssim10^{-20}~{\rm eV}$. The constraints probe the ULDM fraction down to$f\lesssim0.3$ of the total dark matter.

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