Mathematics – Logic
Scientific paper
Jul 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995aipc..336..201b&link_type=abstract
Dark matter. AIP Conference Proceedings, Volume 336, pp. 201-207 (1995).
Mathematics
Logic
5
Dark Matter, Astronomical Observations, Galaxy Clusters, Observational Cosmology
Scientific paper
Two fundamental questions in cosmology are what is the amount and composition of matter in the universe. Rich clusters of galaxies, the largest virialized systems known, provide a powerful tool in addressing these questions, both on cluster scales of ~Mpc and on larger scales. We use optical, X-ray, and gravitational-lensing data of clusters to trace the mass and mass-to-light ratio in clusters. The data indicate a mass-density on cluster scale of Ω~0.2. We suggest that the dark matter in clusters may be mostly accounted for by the dark matter of large galaxy halos now stripped in the clusters. We also use cluster properties such as the mass-function and correlation-function of clusters to constrain cosmological model parameters when compared with model simulations. For the currently popular CDM and PBI models, the cluster data is best fit by a low-density universe with Ω~0.2 and Ω=1 CDM model is inconsistent with the data. If Ω~0.15-0.2, as suggested by cluster observations, then the dark-matter is mostly associated with galaxy halos and clusters, and may possibly be all baryonic. If, on the other hand, Ω=1, then the dark-matter distribution is highly biased and is mostly non-baryonic.
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