Volume 543, July 2012
|Number of page(s)||8|
|Section||Cosmology (including clusters of galaxies)|
|Published online||04 July 2012|
Galaxy cluster angular-size data constraints on dark energy
1 Department of Astronomy, Beijing Normal University, 100875, Beijing, PR China
2 Department of Physics, Kansas State University, 116 Cardwell Hall, Manhattan, KS 66506, USA
Received: 25 August 2011
Accepted: 20 April 2012
We use angular size versus redshift data for galaxy clusters provided by Bonamente and collaborators to place constraints on model parameters of constant and time-evolving dark energy cosmological models. These constraints are compatible with those from other recent data, but are not very restrictive. A joint analysis of the galaxy cluster angular-size data with the more restrictive baryon acoustic oscillation peak length scale and supernova Type Ia apparent-magnitude data, favors a spatially flat cosmological model currently dominated by a time-independent cosmological constant, but does not exclude time-varying dark energy.
Key words: cosmology: miscellaneous / cosmology: theory / dark energy
© ESO, 2012
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