The mass of the Milky Way Galaxy

Details The mass of the Milky Way Galaxy The mass of the Milky Way Galaxy

Mar 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992mnras.255..105k&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 255, March 1, 1992, p. 105-118.

Astronomy and Astrophysics

Astronomy

65

Galactic Mass, Mass Distribution, Maximum Likelihood Estimates, Milky Way Galaxy, Dwarf Galaxies, Galactic Structure, Globular Clusters, Interstellar Matter, Velocity Distribution

Scientific paper

A method for determining the Galactic mass and mass distribution based on maximum likelihood parameter estimation is presented. Assuming that the velocity distribution in the outer Galaxy is isotropic, the Galactic mass and the power-law index for the total matter density profile are determined through maximum likelihood estimation. A mass of around 1.3 x 10 exp 12 solar masses is obtained out to a distance of 230 kpc from the Galactic Center with a corresponding power-law index of 2.4. Confidence regions are derived for these estimates from which a low-mass galaxy (M less than 6 x 10 exp 11 solar mass) can be ruled out with 98 percent confidence. The result suggests a high mass for the Milky Way out to a large distance and relies on the inclusion of the dwarf spheroidal galaxy Leo I in the sample.

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