The flattening of the galactic spheroid

Details The flattening of the galactic spheroid The flattening of the galactic spheroid

Mar 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989mnras.237p..51w&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 237, March 1, 1989, p. 51P-54P.

Other

14

Galactic Structure, Metallic Stars, Milky Way Galaxy, Oblate Spheroids, Solar Neighborhood, Cylindrical Coordinates, Flattening, Virial Theorem

Scientific paper

In the solar neighborhood, the velocity dispersion of metal-poor halo stars is much smaller perpendicular to the galactic plane than in other directions. This dispersion component appears to remain small in distant samples near the galactic poles. A simple argument based on the tensor virial theorem shows that this situation cannot be globally valid for any population with the modest flattening usually assigned to metal-poor Population II. Either the observed kinematic samples are drawn from a highly flattened population, or, more probably, the kinematics of the regions sampled are atypical of the population as a whole.

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