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The 40% Arecibo Legacy Fast ALFA (ALFALFA) survey catalog (\alpha.40) ofapproximately 10,150 HI-selected galaxies is used to analyze the clusteringproperties of gas-rich galaxies. By employing the Landy-Szalay estimator and afull covariance analysis for the two-point galaxy-galaxy correlation function,we obtain the real-space correlation function and model it as a power law,\xi(r) = (r/r_0)^(-\gamma), on scales less than 10 h^{-1} Mpc. As the largestsample of blindly HI-selected galaxies to date, \alpha.40 provides detailedunderstanding of the clustering of this population. We find \gamma = 1.51 +/-0.09 and r_0 = 3.3 +0.3, -0.2 h^{-1} Mpc, reinforcing the understanding thatgas-rich galaxies represent the most weakly clustered galaxy population known;we also observe a departure from a pure power law shape at intermediate scales,as predicted in \Lambda CDM halo occupation distribution models. Furthermore,we measure the bias parameter for the \alpha.40 galaxy sample and find that HIgalaxies are severely antibiased on small scales, but only weakly antibiased onlarge scales. The robust measurement of the correlation function for gas-richgalaxies obtained via the \alpha.40 sample constrains models of thedistribution of HI in simulated galaxies, and will be employed to betterunderstand the role of gas in environmentally-dependent galaxy evolution.

The Clustering Characteristics of HI-Selected Galaxies from the 40% ALFALFA Survey