Total masses of the Local Group and M 81 group derived from the local Hubble flow
Karachentsev, I. D. · Kashibadze, O. G.
Original · EN
Based on accurate measurements of distances to nearby galaxies made with Hubble Space Telescope, we determined the radii of the zero-velocity surface: R₀ = 0.96+-0.03 Mpc for the Local Group and R₀ = 0.89+-0.05 Mpc for the group of galaxies around M81/M82. This yields the total masses of the groups to be Mₜ = (1.29+-0.14) 10¹² Mₛun and Mₜ = (1.03+-0.17) 10¹² Mₛun, respectively. The R₀-method allowed us to determine the mass ratio of the brightest two members in the considered groups. Based on the minimum scatter of galaxies with respect to the Hubble regression, we derived a mass ratio of 0.8: 1.0 for the Milky Way and Andromeda, and 0.54: 1.00 for M82 and M81, which is quite close to the ratio of luminosities of these galaxies.
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