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23 April 2024 |
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Indecent Exposure in Seyfert 2 Galaxies: A Close Look | | Hien D. Tran
; James E. Lyke
; Jeff A. Mader
; | | Date: |
8 Dec 2010 | | Abstract: | NGC 3147, NGC 4698 and 1ES 1927+654 are active galaxies that are classified
as Seyfert 2s, based on the line ratios of strong narrow emission lines in
their optical spectra. However, they exhibit rapid X-ray spectral variability
and/or little indication of obscuration in X-ray spectral fitting, contrary to
expectation from the AGN unification model. Using optical spectropolarimetry
with LRIS and near-infrared spectroscopy with NIRSPEC at the W. M. Keck
Observatory, we conducted a deep search for hidden polarized broad H-alpha and
direct broad Pa-beta or Br-gamma emission lines in these objects. We found no
evidence for any broad emission lines from the active nucleus of these
galaxies, suggesting that they are unobscured, completely "naked" AGNs that
intrinsically lack broad-line regions. | | Source: | arXiv, 1012.1865 | | Services: | Forum | Review | PDF | Favorites | |
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