Clustering of galaxies and clusters of galaxies in a decaying-particle cosmological model with a massive decay product

Details Clustering of galaxies and clusters of galaxies in a decaying-particle cosmological model with a massive decay product Clustering of galaxies and clusters of galaxies in a decaying-particle cosmological model with a massive decay product

Jan 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988stin...8829642t&link_type=abstract

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Mathematics

Logic

Astronomical Models, Cosmology, Galactic Clusters, Star Clusters, Velocity Distribution, Decay, Galactic Evolution, Nuclides, Perturbation

Scientific paper

Based on a decaying-particle cosmological model with a massive decay product whose present Jeans wavelength is approximately 30/h Mpc (the Hubble constant H0 = 100 h/kms/Mpc), we study the correlation functions and velocity distributions of galaxies and clusters of galaxies using the direct method of N body simulation for these objects and the simple difference method for the dark matter fluid consisting of the decay product. It is assumed that the index Ns of the initial density perturbations is 0, -1 and -2, the redshift zd corresponding to the decay time is 2 approximately 3 and the present density parameter omega0 for the decay product is 0.8 approximately 0.9. The dark matter fluid prevents galaxies from clustering in the small-scale and helps clusters of galaxies clustering in the large-scale. Owing to this role of the dark matter fluid, models in the case Ns = 0 approximately -1, zeta0 = 0.8 approximately 0.9 and zd = 2.0 approximately 3.0 are found to be consistent with the observational results on the correlation functions and velocity distributions.

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