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Date and Time of the Query: 2019-08-21 T07:07:16 PDT
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For refcode 2009MNRAS.393.1265K:
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NED Abstract

Copyright by Royal Astronomical Society. 2009MNRAS.393.1265K The Hubble flow around the Local Group Karachentsev, I. D.; Kashibadze, O. G.; Makarov, D. I.; Tully, R. B. Abstract. We use updated data on distances and velocities of galaxies in the proximity of the Local Group (LG) in order to establish properties of the local Hubble flow. For 30 neighbouring galaxies with distances 0.7 < D_LG_ < 3.0 Mpc, the local flow is characterized by the Hubble parameter H_loc_ = (78 +/- 2)kms^-1^ Mpc^-1^, the mean-square peculiar velocity {sigma}_v_ = 25kms^-1^, corrected for errors of radial velocity measurements (~4kms^-1^) and distance measurements (~10kms^-1^), as well as the radius of the zero-velocity surface R_0_ = (0.96 +/- 0.03) Mpc. The minimum value for {sigma}_v_ is achieved when the barycentre of the LG is located at the distance D_c_ = (0.55 +/- 0.05) D_M31_ towards Andromeda galaxy (M31) corresponding to the Milky Way (MW)-to-M31 mass ratio M_MW_/M_M31_ ~= 4/5. In the reference frame of the 30 galaxies at 0.7-3.0 Mpc, the LG barycentre has a small peculiar velocity ~(24 +/- 4)kms^-1^ towards the Sculptor constellation. The derived value of R_0_ corresponds to the total mass M_T_(LG) = (1.9 +/- 0.2) 10^12^ M_sun_ with {OMEGA}_m_ = 0.24 and a topologically flat universe, a value in good agreement with the sum of virial mass estimates for the MW and M31. Key words: Local Group, dark matter
Retrieve 33 NED objects in this reference.
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