Astronomy and Astrophysics – Astrophysics
Scientific paper
2007-03-04
Astronomy and Astrophysics
Astrophysics
To appear in "The Central Engine of Active Galactic Nuclei," eds. L.C. Ho and J.-M. Wang (San Francisco: ASP). 10 pages, uses
Scientific paper
The results of spectropolarimetry surveys of obscured AGNs are reviewed, paying special attention to their implications for the existence of two populations of type 2 Seyfert galaxies -- hidden Seyfert 1s and "true" Seyfert 2s. In this context, the results from our Keck spectropolarimetry survey are presented. Similar to previous work, we have detected hidden broad-line regions (HBLRs) in about half of our sample. However, owing to different selection methods, we find that differences in the properties of HBLR and non-HBLR objects are much less pronounced than prior reports have indicated. Spectropolarimetry studies continue to benefit AGN research, as illustrated by the discovery of double-peaked H-alpha emission in the polarized-flux spectrum of NGC 2110.
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