Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985mnras.212..163m&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 212, Jan. 1, 1985, p. 163-180. Research supported by th
Astronomy and Astrophysics
Astronomy
22
Big Bang Cosmology, Celestial Mechanics, Distance, Local Group (Astronomy), Mass Ratios, Radial Velocity, Andromeda Galaxy, Milky Way Galaxy, Orbital Mechanics, Three Body Problem
Scientific paper
It is assumed that the Local Group of galaxies is an isolated collection of objects, of which only the Milky Way and M31 have dynamically significant masses. It is further demanded that the galaxies in the Local Group emerged from near its barycenter at the Big Bang. This allows one to find the paths these objects have taken to reach their present positions. These positions are uncertain because the distances are not known; however, paths exist for only a limited range of present distances to the objects. It is found what these ranges are as a function of the age of the Universe and the ratio of the Milky Way-to-M31 masses. Results for 21 objects are shown. These results can be compared to measurements to obtain limits on the age of the Universe and the mass ratio. The results for NGC 6822 show that the mass of the Milky Way is at least half that of M31. Further distance measurements are necessary to narrow the limits on the age, the most useful galaxy in this pursuit being IC 5152.
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