The Sagittarius-Carina arm and halo mass of our Galaxy with different rotation curves

Details The Sagittarius-Carina arm and halo mass of our Galaxy with different rotation curves The Sagittarius-Carina arm and halo mass of our Galaxy with different rotation curves

Feb 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002acasn..43...24z&link_type=abstract

Acta Astronomica Sinica, vol.43, no.1, p.24-32

Astronomy and Astrophysics

Astronomy

Galaxy, Spiral Structure, Halo

Scientific paper

We revised the Sagittarius-Carina arm pattern by H II regions and the Giant Molecular Clouds, according to the new Galaxy rotation curve and the Galactic constants. We found the pitch angle of the spiral arm is approximately 12°which depends on the Galactic constants R0 and V0. We get the result that the pitch angle has a tendency to become larger when the values of R0 and V0 decrease. So according to logarithmic spiral model, the number of the Galactic arms seems to become larger. And the halo mass of the Galaxy also decreases with the declining of the rotation curve.

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