The galactic disk surface mass density and the Galactic force K(z) at Z = 1.1 kiloparsecs

Details The galactic disk surface mass density and the Galactic force K(z) at Z = 1.1 kiloparsecs The galactic disk surface mass density and the Galactic force K(z) at Z = 1.1 kiloparsecs

Jan 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apj...367l...9k&link_type=abstract

Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 367, Jan. 20, 1991, p. L9-L13.

Astronomy and Astrophysics

Astrophysics

210

Dark Matter, Galactic Mass, Galactic Structure, Milky Way Galaxy, Stellar Motions, Astronomical Models, Astronomical Photometry, Dwarf Stars, Velocity Distribution

Scientific paper

A set of distance and velocity data previously obtained and analyzed is rediscussed to determine the surface mass density of the Galactic disk. These data reliably determine the integral surface mass density of all (disk + halo) Galactic components within 1.1 kpc from the Galactic plane near the sun to be 71 + or 6 solar masses/sq pc, independent of the disk/halo ratio. Determination of the fraction of this total mass which is distributed in the Galactic disk and the fraction which is associated with an extended halo remains highly model-dependent. The best available estimate of the relative contributions of disk mass and halo mass to the local integral surface density, obtained from modeling of the Galactic rotation curve, yields a surface mass density of 48 + or - 9 solar masses/sq pc for mass associated with the Galactic disk near the sun. The corresponding mass of identified disk matter is 48 + or - 8 solar masses/sq pc.

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