The cosmological constant and the clusters of galaxies

Astronomy and Astrophysics – Astrophysics

Scientific paper

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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 from X-ray astronomy techniques. For a flat CDM model with several different values of the cosmological constant, the cluster number density as a function of the redshift is calculated. Comparing the calculated number density at z - 0 with the observed value limits the spectrum parameter Gcy to the range 0.15-0.32. We also show that if Gcy and/or ΩΛ were larger, many more clusters of galaxies would have been formed at high redshifts.

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