Determining the Hubble constant from Hubble parameter measurements

Abstract

We use 28 Hubble parameter, $H(z)$, measurements at intermediate redshifts $0.07\le z\le 2.3$ to determine the present-day Hubble constant $H_0$ in four cosmological models. We measure $H_0=68.3_{-2.6}^{+2.7},68.4_{-3.3}^{+2.9},65.0_{-6.6}^{+6.5}$ and $67.9_{-2.4}^{+2.4}$ km s${}^{-1}$ Mpc${}^{-1}$ (1$\ddot{I}ƒ$ errors) in the $\hat{I}›$CDM (spatially flat and non-flat), $\ddot{I}‰$CDM and $\ddot{I}•$CDM models, respectively. These measured $H_0$ values are more consistent with the lower values determined from recent cosmic microwave background and baryon acoustic oscillation data, as well as with that found from a median statistics analysis of Huchra's compilation of $H_0$ measurements,but include the higher local measurements of $H_0$ within the 2$\ddot{I}ƒ$ confidence limits.

5 pages, 5 figures, 1 table; accepted for publication in ApJ