The dark matter haloes of HI selected galaxies

We present the neutral hydrogen mass (M-HI) function (HIMF) and velocity width (W-50) function (HIWF) based on a sample of 7857 galaxies from the 40 percent data release of the ALFALFA survey (alpha.40). The low mass (velocity width) end of the HIMF (HIWF) is dominated by the blue population of galaxies whereas the red population dominates the HIMF (HIWF) at the high mass (velocity width) end. We use a deconvolution method to estimate the HI rotational velocity (V-rot) functions (HIVF) from the HIWF for the total, red, and blue samples. The HIWF and HIVF for the red and blue samples are well separated at the knee of the function compared to their HIMFs. We then use recent stacking results from the ALFALFA survey to constrain the halo mass (M-h) function of HI-selected galaxies. This allows us to obtain various scaling relations between M-HI -w(50)-V-rot - M-h, which we present. The M-HT - M-h relation has a steep slope similar to 2.10 at small masses and flattens to similar to 0.34 at masses larger than a transition halo mass, log(10)(M(ht)h(70)(2)/M-circle dot) = 10.62. Our scaling relation is robust and consistent with a volume-limited sample of alpha.40. The M-HI- M-h relation is qualitatively similar to the M-star -M-h relation but the transition halo mass is smaller by similar to 1.4 dex compared to that of the M-star -M-h relation. Our results suggest that baryonic processes like heating and feedback in larger mass haloes suppress HI gas on a shorter time-scale compared to star formation.