The distribution of dark galaxies and spin bias

Abstract

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.

matches published version in MNRAS Letters; theoretical model improved, results unchanged

References in corpus (9)

• The spin and shape of dark matter haloes in the Millennium simulation of a LambdaCDM universe
• The star formation histories of galaxies in the Sloan Digital Sky Survey
• Off the baryonic Tully-Fisher relation: a population of baryon-dominated ultra-diffuse galaxies
• (Almost) Dark HI Sources in the ALFALFA Survey: The Intriguing Case of HI1232+20
• Improved $u^{\prime }{g}^{\prime }{r}^{\prime }{i}^{\prime }{z}^{\prime }$ to $UBV{R}_C{I}_C$ Transformation Equations for Main Sequence Stars
• The role of spin in the formation and evolution of galaxies
• Angular Momentum of Dwarf Galaxies
• A random-walk model for dark matter halo spins
• Coupling local to global star formation in spiral galaxies: the effect of differential rotation

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• HI-bearing dark galaxies predictions from constrained Local Group simulations: how many and where to find them
• On the dependence of galaxy assembly bias on the selection criteria, number density, and redshift of galaxy samples
• Searching for Dark Structures: A Comparison of Weak-lensing Convergence Maps and Lensing-weighted Galaxy Density Maps