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Date and Time of the Query: 2019-06-18 T20:40:38 PDT
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For refcode 2001ApJ...554L..19T:
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Copyright by American Astronomical Society. Reproduced by permission
2001ApJ...554L..19T Hidden Broad-Line Seyfert 2 Galaxies in the CfA and 12 micron Samples Hien D. Tran Department of Physics and Astronomy, Johns Hopkins University, Baltimore, MD 21218; tran@pha.jhu.edu Received 2001 March 20; accepted 2001 May 8; published 2001 May 31 ABSTRACT We report the results of a spectropolarimetric survey of the CfA and 12 micron samples of Seyfert 2 (S2) galaxies. Polarized (hidden) broad-line regions (HBLRs) are confirmed in a number of galaxies, and several new cases (F02581-1136, MCG -3-58-7, NGC 5995, NGC 6552, NGC 7682) are reported. The 12 micron S2 galaxy sample shows a significantly higher incidence of HBLRs (50%) than its CfA counterpart (30%), suggesting that the latter may be incomplete in hidden active galactic nuclei. Compared to the non-HBLR S2 galaxies, the HBLR S2 galaxies display distinctly higher radio power relative to their far-infrared output and hotter dust temperature as indicated by the f_25_/f_60_ color. However, the level of obscuration is indistinguishable between the two types of S2 galaxies. These results strongly support the existence of two intrinsically different populations of S2 galaxies: one harboring an energetic, hidden S1 nucleus with a broad-line region and the other a "pure" S2 galaxy, with a weak or absent S1 nucleus and a strong, perhaps dominating starburst component. Thus, the simple purely orientation-based unification model is not applicable to all Seyfert galaxies. Subject headings: galaxies: active-galaxies: Seyfert-polarization
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