  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 $10^{-24}~{\rm eV}\lesssim
m\lesssim10^{-20}~{\rm eV}$. The constraints probe the ULDM fraction down to
$f\lesssim0.3$ of the total dark matter.
