Age and Mass of the Local Group from Satellite Galaxy Dynamics

Details Age and Mass of the Local Group from Satellite Galaxy Dynamics Age and Mass of the Local Group from Satellite Galaxy Dynamics

Jan 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999iaus..192..420w&link_type=abstract

The stellar content of Local Group galaxies, Proceedings of the 192nd symposium of the International Astronomical Union held in

Mathematics

Logic

4

Scientific paper

The present kinematics of an unrelaxed system such as the Local Group can be used to determine its dynamics on a cosmological time scale. In particular, the classical timing argument of Kahn and Woltjer may be extended to apply to distant satellite galaxies of the Local Group whose distances and velocities are known with some accuracy. Including a correction for the fact that the Local Group was not always dynamically isolated, I derive a mass for the Group of about 1.6 x 1012 solar masses and an age of 1.0 to 1.2 x 1010 years.

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