Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000pasj...52..305v&link_type=abstract
Publications of the Astronomical Society of Japan, v.52, p.305.
Astronomy and Astrophysics
Astronomy
3
Galaxies: Active, Galaxies: Evolution, Galaxies: General, Galaxies: Nuclei, Luminosity Function
Scientific paper
We present an estimate of the shape of the luminosity functions in the nearby Universe for the 4 types of extragalactic nuclear activity cited in Ho et al. (1997a, AAA 68.158.311), i.e., H II, LINER, Transition, and Seyfert galaxies, based on a magnitude limited complete sample of objects selected from the same work. This sample includes quite weaker nuclear emission objects than considered in previous studies, which has allowed us to assess the low-luminosity ends of the nuclear activity sequence for each type. It is found that three of the classes (LINER, Transition, and Seyferts) have very similar luminosity function shapes, and basically seem to differ only in the relative numbers. H II objects tend to be found in different hosts (lower luminosity galaxies) and seem to have a bimodal luminosity function, with a fairly large proportion of Irr and dwarf galaxies in this class, which are superposed to a more Schechter-like luminosity function. Several observational properties also suggest that Transition objects are actually LINERs contaminated by H II regions, and should be included in that category. Our fits further suggest the presence of a substantial number of low-luminosity host Seyferts in the nearby Universe. The distribution of absolute magnitudes for Seyferts type 1 and 2 is very similar in our sample. The possibility that the LINER class encompasses several different classes of objects is also discussed.
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