Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992mnras.257..707h&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 257, no. 4, Aug. 15, 1992, p. 707-714.
Astronomy and Astrophysics
Astronomy
12
Galactic Structure, Hydrogen Clouds, Milky Way Galaxy, Molecular Clouds, Elliptical Orbits, Gravitational Fields, Stellar Gravitation
Scientific paper
Among high-velocity clouds of neutral hydrogen (HVCs) a so-called Outer Arm Cloud, often interpreted as a part of the general warp of the Milky Way disk, can be distinguished. Closer inspection of the arm shows that its velocity field can be explained in two ways: (1) gas is moving in a circular orbit around the Galactic Center, but the sun has a galactocentric radial velocity component with respect to the Local Standard of Rest of 28.5 km/s rather than -9.2 km/s as usually accepted; (2) gas is moving in an elliptic orbit around the Galactic Center. From these two possibilities only the second one seems to be acceptable, if it is assumed that the gravitational potential of the Galaxy is slightly triaxial. The best representation of the observations can be obtained in a triaxial model with an asymptotically flat rotation curve, where the gas orbits have an axial ratio not less than 0.8, and the longest axis of the potential isosurfaces points towards 124 deg.
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