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Title:
Low-Luminosity and Obscured Seyfert Nuclei in Nearby Galaxies
Authors:
Maiolino, R.; Rieke, G. H.
Publication:
Astrophysical Journal v.454, p.95 (ApJ Homepage)
Publication Date:
11/1995
Origin:
APJ; KNUDSEN
Astronomy Keywords:
GALAXIES: ACTIVE, GALAXIES: SEYFERT, GALAXIES: NUCLEI
DOI:
10.1086/176468
Bibliographic Code:
1995ApJ...454...95M

Abstract

We discuss the Seyfert galaxies in the Revised Shapley-Ames catalog (BT < 13.31) and in three extensions to it (BT < 13.4). The sample contains 91 relatively nearby Seyfert galaxies. The proximity of the objects reduces the dilution of their nuclear spectra by the host galaxy light. As a consequence, biases against low-luminosity nuclei (relative to the host) and against edge-on galaxies are reduced compared with other samples of Seyfert galaxies.

From this sample, we set a lower limit of 5% to the portion of galaxies with Seyfert nuclei; completeness arguments could support a percentage as high as 16%. We find type 2 Seyfert nuclei (i.e., types 1.8 + 1.9 + 2) to be 4 times more numerous than type 1 ones (types 1 + 1.2 + 1.5). Seyfert nuclei of types 1 + 1.2 + 1.5 are mostly found in face-on galaxies, while intermediate nuclei of types 1.8 + 1.9 are mostly found in edge-on hosts. These results suggest that most of the intermediate type Seyfert nuclei are type 1 nuclei seen through a 100 pc-scale torus coplanar with the galactic disk and not type 1 nuclei partially obscured by an inner parsec-scale torus.


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