On the interpretation of rotation curves measured at large galactocentric distances

Details On the interpretation of rotation curves measured at large galactocentric distances On the interpretation of rotation curves measured at large galactocentric distances

Jul 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982apj...258l..23b&link_type=abstract

Astrophysical Journal, Part 2 - Letters to the Editor, vol. 258, July 1, 1982, p. L23-L27.

Astronomy and Astrophysics

Astrophysics

116

Galactic Rotation, Galactic Structure, Mass Distribution, Milky Way Galaxy, Astronomical Models, Density Distribution, Neutrinos

Scientific paper

It is shown that the inferred slope of the density law for a massive galactic halo is sensitive to the distribution of mass within the radius of interest. Illustrative rotation curves are presented that are flat to + or - 1 km/s in the region from 40 to 60 kpc, but which have local logarithmic slopes for the halo density law of about 2.7 (and in one case a finite total mass) instead of the conventionally assumed logarithmic slope of 2.0. The contributions of the disk and spheroid must be taken into account in the intermediate region of about 10-30 kpc in which most current observations are being carried out. These results complicate the interpretation of galaxy rotation curves at large galactocentric distances.

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