期刊
ASTROPHYSICAL JOURNAL LETTERS
卷 680, 期 1, 页码 L1-L4出版社
IOP PUBLISHING LTD
DOI: 10.1086/589744
关键词
cosmological parameters; cosmology : observations; X-rays : galaxies : clusters
We use the Allen et al. galaxy cluster gas mass fraction versus redshift data to constrain parameters of three different dark energy models: a cosmological constant dominated one (Lambda CDM), the XCDM parameterization of dark energy, and a slowly rolling scalar field model with inverse power-law potential energy density. (Instead of using the Monte Carlo Markov chain method, when integrating over nuisance parameters we use an alternative method of introducing an auxiliary random variable.) The resulting constraints are consistent with, and typically more constraining than, those derived from other cosmological data. A time-independent cosmological constant is a good fit to the galaxy cluster data, but slowly evolving dark energy cannot yet be ruled out.
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