Journal
ASTROPHYSICAL JOURNAL LETTERS
Volume 766, Issue 1, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/2041-8205/766/1/L7
Keywords
cosmological parameters; cosmology: observations; dark energy
Categories
Funding
- DOE [DEFG03-99EP41093]
- NSF [AST-1109275]
- Division Of Astronomical Sciences
- Direct For Mathematical & Physical Scien [1109275] Funding Source: National Science Foundation
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We compile a list of 28 independent measurements of the Hubble parameter between redshifts 0.07 <= z <= 2.3 and use this to place constraints on model parameters of constant and time-evolving dark energy cosmologies. These H(z) measurements by themselves require a currently accelerating cosmological expansion at about, or better than, 3 sigma confidence. The mean and standard deviation of the six best-fit model deceleration-acceleration transition redshifts (for the three cosmological models and two Hubble constant priors we consider) are z(da) = 0.74 +/- 0.05, in good agreement with the recent Busca et al. determination of z(da) = 0.82 +/- 0.08 based on 11 H(z) measurements between redshifts 0.2 <= z <= 2.3, almost entirely from baryon-acoustic-oscillation-like data.
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