AGN with faint broad line regions: Some 'True'-Seyfert 2s might be Narrow Line Seyfert 1s. Issue Volume 9:Issue S304(2013) (25th July 2014)

• Record Type: Journal Article
• Authors: Valencia-S., Mónica; Busch, G.; Smajić, S.; Fazeli, N.; Behroozian, S.; Zuther, J.; Fischer, S.; Eckart, A.
• Is Part Of: Proceedings of the International Astronomical Union. Volume 9:Issue S304(2013)
• Page Start: 274
• Page End: 277
• Publication Date: 2014-07-25
• Subjects: galaxies: Seyfert, -- galaxies: fundamental parameters, -- techniques: high angular resolution, -- line: profiles, -- galaxies: individual (IRAS 01072+4954, NGC 7496); Astronomy -- Congresses; Astronomy -- Periodicals; 520
• DOI: 10.1017/S1743921314004050
• Languages: English
• ISSNs: 1743-9213

Abstract

Abstract: The intriguing existence of 'True'-Seyfert 2s has opened a debate on the validity of the unified model of active galactic nuclei (AGN). These objects, also called 'Naked'-AGN, seem to lack a broad line region. In some cases, their X-ray emission is unabsorbed, typical of Seyfert 1 galaxies, indicating a clear view toward the nucleus, but no broad lines are seen in the optical. In 'True'-Seyfert 2s with higher column densities, observations of polarized light have failed to reveal the hidden broad emission. We performed high-resolution near-infrared integral-field observations of two 'True'-Seyfert 2 candidates: IRAS 01072+4954 and NGC 7496. We found that the AGN in these sources might power very faint and narrow broad emission lines (FWHMbroad < 1500km s −1 ). Here, we discuss the properties of the broad components estimated from published X-ray and/or optical measurements and present their near-infrared candidate identification. Both galaxies host intermediate-mass black holes, with masses ~ 10 5 −10 6 M⊙ . Our results favor the unified model in the cases of high accretion rates, and stress the necessity of a multiwavelength approach to unveil the nature of 'Naked'-AGN.