Astronomy and Astrophysics – Astronomy
Scientific paper
May 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985aj.....90..708k&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 90, May 1985, p. 708-730.
Astronomy and Astrophysics
Astronomy
355
Galactic Nuclei, Galactic Structure, Interacting Galaxies, Molecular Clouds, Seyfert Galaxies, Spiral Galaxies, Star Formation, Balmer Series, Emission Spectra, H Alpha Line, Photoionization, Stellar Magnitude, Stellar Spectrophotometry
Scientific paper
The authors have obtained spectra of the nuclei of 161 interacting spirals, and compared their properties to those of a complete sample of field spirals. They find that the interacting systems show: (1) Significantly higher levels of emission, in equivalent width and luminosity. (2) More active and extensive nuclear star formation, over all Hubble types. (3) More frequent Seyfert nuclei among close pairs, but fewer among very disturbed (post-encounter) systems. (4) Fewer low-ionization nuclei, which have presumably been turned into Seyferts or masked by nuclear H II regions. The higher incidence of Seyferts in the complete sample supports the notion of central compact objects' being common but normally quiescent in luminous spirals, while their deficiency among distorted pairs suggests that these objects may become gas starved.
Hummel Evi
Keel William C.
Kennicutt Robert C. Jr.
van der Hulst J. M.
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