The cosmological constant and clusters of galaxies.

Details The cosmological constant and clusters of galaxies. The cosmological constant and clusters of galaxies.

Jul 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997acaps..17..249m&link_type=abstract

Acta Astrophys. Sin., Vol. 17, No. 3, p. 249 - 255

Mathematics

Logic

Cosmological Constant: Clusters Of Galaxies

Scientific paper

The dependence of the formation redshift of clusters of galaxies on the cosmological constant is discussed on the basis of recent measurements of gravitational masses and radii of galaxy clusters by X-ray astronomy methods. For a flat CDM model with several different values of the cosmological constant, the number density of galaxy clusters as a function of redshift has been calculated. Comparing the derived number density at redshift z = 0 with observed value, the allowed spectrum parameter Γ is found to be limited in the range of 0.15 - 0.32. The authors' calculation also shows that if Γ and/or ΩΛ was larger, much more clusters of galaxies should have been formed at high redshift.

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