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- W2013497789 abstract "A sample of 12 Abell clusters of galaxies has been studied in the optical and X-ray bands. The optical data are derived from automatic photometry based on microdensitometric scans of Palomar Schmidt F-band plates. ROSAT PSPC data were obtained from the public archive. Galaxy density and X-ray luminosity profiles have been constructed and deprojected by parametric and nonparametric techniques to obtain volume density profiles. We find a relation between the gas density ρgas and the galaxy density ρgal consistent with the prediction of the hydrostatic isothermal model. We confirm that more than 70% of the cluster mass is dark within 1.5 Mpc h -->−150 from the cluster center. Outside 250 kpc we find a nearly constant M/LV ratio, which on average is 137 M☉/L☉, implying that the galaxy mass traces the total matter distribution. The dark mass-to-light ratio has a similar behavior. We also find a baryonic fraction fb ≈ 0.2, which, assumed as representative of the cosmic value and compared with nucleosynthesis calculations, constrains the cosmological parameter Ω0 to be smaller than 0.25." @default.
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- W2013497789 date "1997-01-20" @default.
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- W2013497789 title "An X‐Ray and Optical Study of Matter Distribution in Clusters of Galaxies" @default.
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- W2013497789 doi "https://doi.org/10.1086/303538" @default.
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