Hubble parameter and Ω_Λ from observations of radio galaxies

Details Hubble parameter and Ω_Λ from observations of radio galaxies Hubble parameter and Ω_Λ from observations of radio galaxies

Sep 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008paco.conf..109v&link_type=abstract

in 'Particles and Cosmology', Proc. 14th Internat. School, edited by S.V.Demidov, V.A.Matveev, V.A.Rubakov, held in Baksan Valle

Mathematics

Logic

3

Cosmology, Radio Galaxies

Scientific paper

From photometric observations of elliptical galaxies, among which are both radio galaxies and radio-quiet objects, an investigation was carried out of the relationship `redshift - age of the stellar system' (Δ z/Δ t). By means of this relationship cosmological parameters H(z) and Ω_Λ are estimated. Ages of stellar systems are determined within the framework of evolution models of synthetic spectra. This approach can be considered as time study of objects of the early Universe independent of other cosmological models. Construction of a pooled sample is described, containing objects from different populations of elliptical galaxies, for which an analysis of the upper limit of the age of formation of a stellar system was performed. These data were used to estimate the boundaries of determination of the cosmological parameters H_0 and Λ-term: H_0=72+/-10 and Ω_Λ=0.8+/-0.1.

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