Clustering of Galaxies and Clusters of Galaxies in a Decaying-Particle Cosmological Model with a Massive Decay Product : Astrophysics and Relativity

概要

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On the basis of a decaying-particle cosmological model with a massive decay product whose present Jeans wavelength is 〜30h^<-1>Mpc (the Hubble constant H_0=100h km s^<-1>Mpc^<-1>), 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 power index N_s of the power spectrum of the initial density perturbations is 0,- 1 and -2, the redshift z_d corresponding to the decay time is 2〜3 and the present density parameter Ω_<d0> for the density product is 0.8〜0.9. 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 N_s=0〜-1, Ω_<d0>=0.8〜0.9 and z_d=2.0〜3.0 are found to be consistent with the observational results on the correlation functions and velocity distributions.
理論物理学刊行会の論文
1988-06-25