On the mass of the Local Group and the motion of its barycentre

Details On the mass of the Local Group and the motion of its barycentre On the mass of the Local Group and the motion of its barycentre

Apr 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982mnras.199...67e&link_type=abstract

Monthly Notices of the Royal Astronomical Society, vol. 199, Apr. 1982, p. 67-80.

Astronomy and Astrophysics

Astronomy

65

Andromeda Galaxy, Center Of Gravity, Local Group (Astronomy), Mass Distribution, Milky Way Galaxy, Solar Rotation, Galactic Nuclei, Galactic Rotation, Radial Velocity

Scientific paper

The hypothesis that M31 and the Galaxy have almost equal and opposite momenta when seen from the barycenter of the Local Group puts a severe constraint on the component of the sun's motions towards M31. Using this constraint and eliminating distant satellites of Andromeda from the solution, the motion of the sun, as seen from the barycenter, is in galactic coordinates 280 km/sec towards l = 102 deg, b = -5 deg. Using recent more accurate determinations of the sun's motion around the Galaxy which are discussed, the motion of the Galaxy is found to lie 27 + or - 15 deg from the direction of M31 and the total relative velocity of these galaxies is deduced to be 137 + or - 20 km/sec. Better bounds are deduced for the mass of the Local Group.

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