The distribution of dark galaxies and spin bias
  In the light of the discovery of numerous (almost) dark galaxies from the
ALFALAFA and LITTLE THINGS surveys, we revisit the predictions of Jimenez et
al. 1997, based on the Toomre stability of rapidly-spinning gas disks. We have
updated the predictions for $\Lambda$CDM with parameters given by Planck18,
computing the expected number densities of dark objects, and their spin
parameter and mass distributions. Comparing with the data is more challenging,
but where the spins are more reliably determined, the spins are close to the
threshold for disks to be stable according to the Toomre criterion, where the
expected number density is highest, and reinforces the concept that there is a
bias in the formation of luminous galaxies based on the spin of their parent
halo.
