The Local Group's outer Hubble flow has a velocity dispersion of only 15 km/s, implying a total mass of (2.47 +/- 0.15) e12 solar masses and a Milky Way to Andromeda mass ratio of 0.74 +/- 0.10.
S., Rizzi, L., Tully, R
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The frozen outskirts: a cold Hubble flow and the mass of the Local Group
The Local Group's outer Hubble flow has a velocity dispersion of only 15 km/s, implying a total mass of (2.47 +/- 0.15) e12 solar masses and a Milky Way to Andromeda mass ratio of 0.74 +/- 0.10.