Astronomy and Astrophysics – Astronomy
Scientific paper
May 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999aas...194.2003b&link_type=abstract
American Astronomical Society, 194th AAS Meeting, #20.03; Bulletin of the American Astronomical Society, Vol. 31, p.857
Astronomy and Astrophysics
Astronomy
Scientific paper
Low-ionization nuclear emission-line regions, or LINERs, are found in 38% of nearby emission-line galactic nuclei, and 15% of LINERs have a broad component of the Hα emission line similar to that seen in Seyfert 1 nuclei. The fact that many Seyfert 2 nuclei are known to contain ``hidden'' broad-line regions raises the question of whether hidden broad-line regions are present in some in LINERs as well. To determine whether unified models of AGNs are applicable at low luminosities, we have undertaken a spectropolarimetric survey at the Keck Observatory, and here we report our observations of 14 LINER and low-luminosity Seyfert nuclei. Polarized broad Hα emission is definitely detected in two LINERs, NGC 315 and NGC 1052, and is probably detected in a third, NGC 4261. All three of these galaxies are ellipticals hosting double-sided radio jets. In each case the emission-line polarization angle is oriented roughly perpendicular to the jet axis, as expected for scattering above the midplane of an obscuring torus. These results indicate that unified models of AGNs are applicable to at least some members of the LINER class.
Barth Aaron J.
Filippenko Alexei V.
Moran Edward C.
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