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The Cluster M/L and the Value of Omega_m | | H. Andernach
; M. Plionis
; O. L’opez-Cruz
; E. Tago
; S. Basilakos
; | | Date: |
6 Jul 2004 | | Subject: | astro-ph | | Affiliation: | 2,3), O. L’opez-Cruz , E. Tago , S. Basilakos ( Depto. de Astronomia, Univ. Guanajuato, Mexico, Inst. of Astronomy & Astrophysics, Athens, Greece, INAOE, Puebla, Mexico, Tartu Obs. Toravere, Estonia | | Abstract: | From an up-to-date compilation of ACO cluster redshifts and velocity dispersions we extract a homogeneous sample of 459 clusters with robust velocity dispersion. Using the virial theorem to estimate cluster masses, and a correlation between Abell galaxy counts and R-band luminosity, we find a median M/L_R of 174 h_50 M_sun/L_sun. However, if we correct the virial masses according to the X-ray vs. virial mass correlation, as derived from our analysis, we obtain M/L_R ~100 h_50 M_sun/L_sun. These two values of M/L imply a mass content of the Universe of Omega_m ~0.26 and 0.15, respectively. | | Source: | arXiv, astro-ph/0407098 | | Services: | Forum | Review | PDF | Favorites | |
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