Statistics – Computation
Scientific paper
May 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992aj....103.1552m&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 103, no. 5, May 1992, p. 1552-1563.
Statistics
Computation
160
Galactic Rotation, H I Regions, Milky Way Galaxy, Spiral Galaxies, Computational Astrophysics, Galactic Mass
Scientific paper
A new approach to calculating the H I rotation curve of the outer Milky Way is presented. This method uses the variation with galactic longitude in the angular thickness of the H I layer to solve for the distance to slices through the H I data cube. The derived rotation curve shows excellent agreement with other kinematic constraints if the local galactic constants have values of R0 = 7.9 +/- 0.8 kpc and Theta0 = 200 +/- 10 km/s. This procedure also yields the variation in thickness of the H I layer with radius. If it is assumed that this gas has a constant velocity dispersion, then application of the hydrostatic equilibrium equation implies that the mass density in the plane of the Galaxy drops approximately exponentially with radius with an e-folding length of 0.49 +/- 0.06 R0. Combining this information with the derived rotation curve then allows the construction of a full mass model for the Milky Way.
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