Indecent Exposure in Seyfert 2 Galaxies: A Close Look

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, cont...

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Bibliographic Details
Published in:arXiv.org 2010-12
Main Authors: Tran, Hien D, Lyke, James E, Mader, Jeff A
Format: Article
Language:English
Subjects:
Active galactic nuclei
Active galaxies
Emission spectra
Gamma emission
Infrared spectra
Line spectra
Near infrared radiation
Occultation
Seyfert galaxies
Spectrum analysis
X ray spectra
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Summary: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 active galactic nucleus (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.
ISSN:2331-8422
DOI:10.48550/arxiv.1012.1865