The halo mass function of late-type galaxies from HI kinematics

Abstract

We present an empirical method to measure the halo mass function (HMF) of galaxies. We determine the relation between the \hi\ line-width from single-dish observations and the dark matter halo mass ($M_{200}$) inferred from rotation curve fits in the SPARC database, then we apply this relation to galaxies from the \hi\ Parkes All Sky Survey (HIPASS) to derive the HMF. This empirical HMF is well fit by a Schecther function, and matches that expected in $\Lambda$CDM over the range $10^{10.5}<M_{200}<10^{12}{\mathrm{M}}_{\odot }$. More massive halos must be poor in neutral gas to maintain consistency with the power law predicted by $\Lambda$CDM. We detect no discrepancy at low masses. The lowest halo mass probed by HIPASS, however, is just greater than the mass scale where the Local Group missing satellite problem sets in. The integrated mass density associated with the dark matter halos of \hi-detected galaxies sums to ${\Omega }_{\mathrm{m},\mathrm{gal}}\approx 0.03$ over the probed mass range.

7 pages, 3 figures, 1 table. Accepted for publication in ApJ Letters

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• A Stochastic Theory of the Hierarchical Clustering I. Halo Mass Function
• Tomography-based observational measurements of the halo mass function via the submillimeter magnification bias
• The GMRT archive atomic gas survey -- II. Mass modelling and dark matter halo properties across late-type spirals
• The Dark Matter Halos of HI Selected Galaxies
• The Effect of the Angular Momentum in the Formation and Evolution of Low Surface Brightness Galaxies
• On constraining Cosmology and the Halo Mass Function with Weak Gravitational Lensing
• The Pedagogical Representation of Mass Functions with LEGO and their Origin
• The circular velocity and halo mass functions of galaxies in the nearby Universe
• On the radial acceleration of disk galaxies
• Bounding the Cosmological Constant using Galactic Rotation Curves from the SPARC Dataset
• The Visualization and Measurements of Mass Functions with LEGO