Astronomy and Astrophysics – Astrophysics
Scientific paper
Jun 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989a%26a...217...66a&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 217, no. 1-2, June 1989, p. 66-78. Research supported by the European Southern
Astronomy and Astrophysics
Astrophysics
74
Active Galactic Nuclei, Barred Galaxies, Nuclear Astrophysics, Star Formation, Starburst Galaxies, Astronomical Spectroscopy, Galactic Rotation, Galactic Structure
Scientific paper
A detailed study of the spiral galaxy NGC 4321 showed that the nuclear star formation mechanism in this galaxy is very likely related to the orbits perturbation at the Inner Linblad Resonances. In order to test the hypothesis that the same physical mechanism accounts generally for such activity in spiral galaxies, a morphological analysis of a sample of starburst nuclei and active galactic nuclei (STB, AGN) as well as a control sample of normal galaxies has been carried out. It is found that the morphological type expected for starbursters like NGC 4321 (SAB(rs) or stronger), occurs at a much higher frequency in the sample of STBs and AGNs than in the control sample. The effect is stronger for STBs than for AGNs. This provides strong evidences that active formation of stars in the nuclei of spiral galaxies is linked to the perturbation of orbits at the Inner Linblad Resonances. This interpretation leads to the suggestion that an effective nuclear starburst phase is an inhibition mechanism to a more powerful type of nuclear activity like in AGNs.
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