Astronomy and Astrophysics – Astrophysics
Scientific paper
Jul 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984ap%26ss.102...81u&link_type=abstract
Astrophysics and Space Science (ISSN 0004-640X), vol. 102, no. 1, July 1984, p. 81-95.
Astronomy and Astrophysics
Astrophysics
3
Disk Galaxies, Galactic Rotation, Galactic Structure, Mass Distribution, Spiral Galaxies, Andromeda Galaxy, Astronomical Models, Curve Fitting, Galactic Mass, Gravitational Fields, Mass To Light Ratios, Milky Way Galaxy
Scientific paper
A method to fit flat rotation curves is presented, wherein the galactic density for a disk model is expressed in terms of a Dirichlet polynomial. This procedure makes it possible to obtain the total galactic mass and to predict the circular velocity at large galactocentric distances. Application of the method to the Galaxy, M31 and four Sc galaxies shows that a significant galactic mass is located beyond the optical radius although it is considerably smaller than the integral mass values obtained from current models with massive corona included. Observed rotation curves and convergent total mass are obtained, thus the total mass for the Milky Way Galaxy is 5.69 x 10 to the 11th solar masses.
Tharrats J.
Ubriaco M.
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