Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21714252t&link_type=abstract
American Astronomical Society, AAS Meeting #217, #142.52; Bulletin of the American Astronomical Society, Vol. 43, 2011
Astronomy and Astrophysics
Astronomy
Scientific paper
NGC 3147, NGC 4698 and 1ES 1927+654 are three Seyfert 2 galaxies with an unusual combination of properties: X-ray spectra show variability and little absorption indicative of a type-1 (direct) view, but optical spectra show only narrow emission lines, typical of a type-2 (obscured) view of the nucleus. A deep search for hidden broad-line regions (BLR) using Keck LRIS spectropolarimetry and direct near-IR spectroscopy with NIRSPEC does not reveal any broad emission lines, hidden or direct. If typical broad lines were present, the BLR non-detections would indicate an extinction of 11 - 26 mag, inconsistent with their ``naked'' nature. While the obscuration may be due to different material for X-ray and optical light, it appears that the BLRs in these objects are anemically small or nonexistent, due to the weakness of their active central engines.
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