Astronomy and Astrophysics – Astrophysics
Scientific paper
May 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976apj...206..114h&link_type=abstract
Astrophysical Journal, vol. 206, May 15, 1976, pt. 1, p. 114-121. NSF-supported research.
Astronomy and Astrophysics
Astrophysics
41
Density Wave Model, Galactic Structure, Radial Velocity, Spiral Galaxies, Stellar Motions, Least Squares Method, Star Clusters, Supergiant Stars, Tables (Data), Velocity Distribution
Scientific paper
An examination of the motions of the optical spiral tracers in the Perseus arm reveals a clear kinematic separation between the inner and outer sides of the arm. Those objects on the inner or near side have a mean velocity residual of -10.7 km/s, while those on the outer or far side have a mean positive residual of +7.0 km/s. These velocity residuals are interpreted in terms of the linear density-wave theory as streaming motions between the sides of the arm. Plausible solutions for the amplitudes of the noncircular motions yielded 10 to 20 km/s and 7 to 15 km/s for the radial and tangential components, respectively. These results are about twice the amplitudes suggested by the theory.
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