Astronomy and Astrophysics – Astrophysics
Scientific paper
Oct 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977apj...217l...1r&link_type=abstract
Astrophysical Journal, Part 2 - Letters to the Editor, vol. 217, Oct. 1, 1977, p. L1-L4.
Astronomy and Astrophysics
Astrophysics
30
Galactic Nuclei, Galactic Rotation, Spiral Galaxies, Astrophysics, Galactic Evolution
Scientific paper
A large velocity gradient is observed in the excited nuclear gas of NGC 3672 when the slit is aligned along the minor axis, and a nuclear velocity gradient smaller than that implied by the rotation curve of the outer disk is observed with the slit along the major axis. The most direct interpretation of this obsevation is that the rotation axis of the nuclear gas disk makes a large angle with the rotation axis of the outer galaxy as a whole. An alternative explanation is that the nuclear gas is not rotating, but contracting (at about 50 km/s) in the plane of the outer disk. Both models imply that a transient phenomenon is being observed. The nucleus is small, less than 350 pc, and of low mass about 200 million solar masses, compared with a galaxy mass of approximately 140 billion solar masses.
Ford Kent Jr. W.
Rubin Vera Cooper
Thonnard N. .
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