Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979apjs...39..439g&link_type=abstract
Astrophysical Journal Supplement Series, vol. 39, Apr. 1979, p. 439-460.
Astronomy and Astrophysics
Astrophysics
44
Flow Velocity, Galactic Structure, Gas Flow, Spiral Galaxies, Curve Fitting, Emission Spectra, Error Analysis, Galactic Nuclei, Radial Velocity, Tables (Data)
Scientific paper
Radial velocities of the ionized gas in the optical disk of M51 are derived from a set of 16 spectrograms taken in 13 position angles with the Kitt Peak 4 m telescope. Over most of the disk these data confirm the velocity field derived by Tully. An asymmetric rotation curve can fit the large-scale velocity field, but a variety of deviations from rotation are also significant. In the outer arms the velocity deviations are probably due largely to the tidal interaction between M51 and NGC 5195. Near the nucleus the deviations confirm the Burbidges' finding of large noncircular motions. These can be described as z motions or as the rotation plus z motion of a tilted nuclear disk. However, the nuclear motions and the unusual emission-line behavior are still essentially not understood.
de Veny James B.
Goad Jean W.
Goad Larry E.
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