Astronomy and Astrophysics – Astrophysics
Scientific paper
May 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987apj...316l..67r&link_type=abstract
Astrophysical Journal, Part 2 - Letters to the Editor (ISSN 0004-637X), vol. 316, May 15, 1987, p. L67-L69.
Astronomy and Astrophysics
Astrophysics
19
Galactic Nuclei, Galactic Rotation, Hubble Diagram, Spiral Galaxies, Legendre Functions, Random Sampling, Seyfert Galaxies
Scientific paper
New rotation curves have been obtained for the purpose of probing the distribution of matter at small radial distances from the nuclei of spiral galaxies. Four Sc galaxies, NGC 2742, 3198, 5676, and 6643, have rotation velocities that remain high at the first measured point, which is generally within 250 pc of the nucleus. Elementary modeling applied to one galaxy, NGC 2742, shows that a significant central mass concentration (about 10 to the 8th solar masses interior to 250 pc) is present. The new data confirm that the rotation curve as a whole is an excellent criterion of absolute magnitude and one which can be used to investigate anisotropies in the Hubble flow. Intrinsically broad nuclear emission lines are found for the first time in NGC 5985 and are observed again in some previously reported examples (NGC 2639, 4594, 5506, and 6764). NGC 4845 shows an interesting boxlike morphology and an emission-line inner velocity field which cannot arise froma simple rotating disk.
Graham John A.
Rubin Vera Cooper
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