Astronomy and Astrophysics – Astrophysics – Cosmology and Extragalactic Astrophysics

Scientific paper

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2010-07-22

Astrophys.J. 730 (2011) 74

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

8 pages, 1 table, 8 figures. v2: version accepted by ApJ

Scientific paper

10.1088/0004-637X/730/2/74

We use simulated Hubble parameter data in the redshift range 0 \leq z \leq 2 to explore the role and power of observational H(z) data in constraining cosmological parameters of the {\Lambda}CDM model. The error model of the simulated data is empirically constructed from available measurements and scales linearly as z increases. By comparing the median figures of merit calculated from simulated datasets with that of current type Ia supernova data, we find that as many as 64 further independent measurements of H(z) are needed to match the parameter constraining power of SNIa. If the error of H(z) could be lowered to 3%, the same number of future measurements would be needed, but then the redshift coverage would only be required to reach z = 1. We also show that accurate measurements of the Hubble constant H_0 can be used as priors to increase the H(z) data's figure of merit.

**Ma Cong**

Astronomy and Astrophysics – Astrophysics – Cosmology and Extragalactic Astrophysics

Scientist

**Zhang Tong-Jie**

Astronomy and Astrophysics – Astrophysics

Scientist

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