Masses of the local group and of the M81 group estimated from distortions in the local velocity field

  title={Masses of the local group and of the M81 group estimated from distortions in the local velocity field},
  author={Igor D. Karachentsev and Olga Kashibadze},
Based on high precision measurements of the distances to nearby galaxies with the Hubble telescope, we have determined the radii of the zero velocity spheres for the local group, R0 = 0.96±0.03Mpc, and for the group of galaxies around M 81/M 82, 0.89±0.05Mpc. These yield estimates of MT = (1.29±0.14)· 1012 M⊙ and (1.03±0.17)· 1012 M⊙, respectively, for the total masses of these groups. The R0 method allows us to determine the mass ratios for the two brightest members in both groups, as well. By… 
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