Where does the Dark Halo of the Galaxy End?

Details Where does the Dark Halo of the Galaxy End? Where does the Dark Halo of the Galaxy End?

Aug 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997esasp.402..537m&link_type=abstract

Proceedings of the ESA Symposium `Hipparcos - Venice '97', 13-16 May, Venice, Italy, ESA SP-402 (July 1997), p. 537-540

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Scientific paper

We estimate the mass and the extent of our Galaxy with a massive dark halo from extreme spatial velocities of Hipparcos RR Lyrae stars and other velocity sources. We find the most extreme velocity in the range 420-480 km/s for the present sample. The galactic potential dominated by the massive halo is modelled simply by a spherical logarithmic one, in which the mass distribution is truncated at a galactic boundary. Contrary to the popular concept of `escape' or `bound', we introduce another extreme condition on trapped orbits, in which no star can leak out of the galactic boundary. Then, the above range of the extreme velocity gives the boundary radius of 50 kpc -100 kpc and the total mass of 5.5 x 10^(11) M_(solar) - 1.1 x 10^(12) M_(solar).

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