SIMBAD references

2003MNRAS.344..257F - Mon. Not. R. Astron. Soc., 344, 257-261 (2003/September-1)

Using bright ellipticals as dark energy cosmic clocks.


Abstract (from CDS):

The age of the Universe has been increasingly constrained by different techniques, such as the observations of type Ia supernovae (SNIa) at high redshift or dating the stellar populations of globular clusters. In this paper, we present a complementary approach using the colours of the brightest elliptical galaxies in clusters over a wide redshift range (z ≲ 1). We put new and independent bounds on the dark energy equation of state parametrized by a constant pressure-to-density ratio wQ and by a parameter (ξ) which determines the scaling between the matter and dark energy densities. We find that accurate estimates of the metallicities of the stellar populations in moderate and high-redshift cluster galaxies can pose stringent constraints on the parameters that describe dark energy. Our results are in good agreement with the analysis of dark energy models using SNIa data as a constraint. Accurate estimates of the metallicities of stellar populations in cluster galaxies at z ≲ 2 will make this approach a powerful complement to studies of cosmological parameters using high-redshift SNIa.

Abstract Copyright: 2003 RAS

Journal keyword(s): galaxies: elliptical and lenticular, cD - galaxies: evolution - galaxies: high-redshift - cosmic microwave background - cosmology: observations

CDS comments: p. 258: MS 1054+03 is a misprint for 1054-03

Simbad objects: 3

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