Galaxy cluster angular size data constraints on dark energy

Details Galaxy cluster angular size data constraints on dark energy Galaxy cluster angular size data constraints on dark energy

2011-05-27

arxiv.org/abs/1105.5660v2

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

8 pages, 11 figures, 2 tables

Scientific paper

We use angular size versus redshift data for galaxy clusters from Bonamente et al. (2006) 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 angular size data with 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.

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