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Luminosity density estimation from redshift surveys and the mass density of the Universe | | Michael Joyce
; Francesco Sylos Labini
; | | Date: |
7 May 2001 | | Subject: | astro-ph | | Abstract: | In most direct estimates of the mass density (visible or dark) of the Universe, a central input parameter is the luminosity density of the Universe. Here we consider the measurement of this luminosity density from red-shift surveys, as a function of the yet undetermined characteristic scale R_H at which the spatial distribution of visible matter tends to a well defined homogeneity. Making the canonical assumption that the cluster mass to luminosity ratio M/L is the universal one, we can estimate the total mass density as a function Omega_m(R_H,M/L). Taking the highest estimated cluster value M/L ~300h and a conservative lower limit R_H > 20 Mpc/h, we obtain the upper bound Omega_m < 0.1 . We note that for values of the homogeneity scale R_H in the range R_H ~ (90 +/- 45) hMpc, the value of Omega_m may be compatible with the nucleosynthesis inferred density in baryons. | | Source: | arXiv, astro-ph/0105104 | | Services: | Forum | Review | PDF | Favorites | |
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