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AGN with faint broad line regions: Some ‘True’-Seyfert 2s might be Narrow Line Seyfert 1s

Published online by Cambridge University Press:  25 July 2014

Mónica Valencia-S. ,
G. Busch ,
S. Smajić ,
N. Fazeli ,
S. Behroozian ,
J. Zuther ,
S. Fischer  and
A. Eckart
Mónica Valencia-S.*
Affiliation:
I. Physikalisches Institut, University of Cologne, Zülpicher Str. 77, 50937 Cologne, Germany
G. Busch
Affiliation:
I. Physikalisches Institut, University of Cologne, Zülpicher Str. 77, 50937 Cologne, Germany
S. Smajić
Affiliation:
I. Physikalisches Institut, University of Cologne, Zülpicher Str. 77, 50937 Cologne, Germany
N. Fazeli
Affiliation:
I. Physikalisches Institut, University of Cologne, Zülpicher Str. 77, 50937 Cologne, Germany
S. Behroozian
Affiliation:
I. Physikalisches Institut, University of Cologne, Zülpicher Str. 77, 50937 Cologne, Germany
J. Zuther
Affiliation:
I. Physikalisches Institut, University of Cologne, Zülpicher Str. 77, 50937 Cologne, Germany
S. Fischer
Affiliation:
Deutsches Zentrum für Luft- und Raumfahrt (DLR), Königswinterer Str. 522-524, 53227 Bonn, Germany
A. Eckart
Affiliation:
I. Physikalisches Institut, University of Cologne, Zülpicher Str. 77, 50937 Cologne, Germany Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, 53121 Bonn, Germany
*
†email: [email protected]
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Abstract

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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 ~ 105−106 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.

Keywords

galaxies: Seyfertgalaxies: fundamental parameterstechniques: high angular resolutionline: profilesgalaxies: individual (IRAS 01072+4954, NGC 7496)
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 9 , Symposium S304: Multiwavelength AGN Surveys and Studies , October 2013 , pp. 274 - 277
Copyright
Copyright © International Astronomical Union 2014 

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