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Title:
The ionization cone, obscured nucleus, and gaseous outflow in NGC 3281 - A prototypical Seyfert 2 galaxy?
Authors:
Storchi-Bergmann, Thaisa; Wilson, Andrew S.; Baldwin, Jack A.
Affiliation:
AA(Rio Grande do Sul, Universidade Federal, Porto Alegre, Brazil; Maryland, University, College Park), AB(Maryland, University, College Park; Space Telescope Science Institute, Baltimore), AC(Cerro Tololo Inter-American Observatory, La Serena, Chile)
Publication:
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 396, no. 1, Sept. 1, 1992, p. 45-61. Research supported by CNPq of Brazil. (ApJ Homepage)
Publication Date:
09/1992
Category:
Astrophysics
Origin:
STI
NASA/STI Keywords:
Galactic Nuclei, Gas Flow, Ionized Gases, Oxygen Ions, Oxygen Spectra, Seyfert Galaxies, Gas Dynamics, Line Of Sight
DOI:
10.1086/171696
Bibliographic Code:
1992ApJ...396...45S

Abstract

Narrow-band images and long-slit spectroscopy of the central region of the highly inclined Seyfert galaxy NGC 3281 are presented. The image of the continuum-subtracted forbidden 4959 emission line shows a very clear conical morphology for the high-excitation gas. A possible similar structure can also be seen on the other side of the nucleus, but is dimmed by patchy obscuration in the dusk. The continuum images and long-slit spectroscopy are used to derive and map the extinction in the inner regions of NGC 3281; heavy obscuration is found along the present line of sight to the apex of the cone, suggesting that the true nucleus is located at the apex and is obscured. Low-resolution long-slit spectra are used to study the stellar population, which is found to be old, uniform within 2.5 kpc of the nucleus, and typical of the bulges of early-type galaxies. It is suggested that NGC3281 may be another example of a 'hidden' Seyfert 1, even though there is no direct evidence for a broad-line region in this particular galaxy.

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