Detection of faint broad emission lines in type 2 AGN - I. Near-infrared observations and spectral fitting

Journal
Date Issued
2017
Author(s)
•
La Franca, F.
•
Ricci, F.
•
Brusa, M.
•
Sani, E.
•
Maiolino, R.
•
BIANCHI, SIMONE
•
•
•
•
Vignali, C.
DOI
Abstract
We present medium resolution near-infrared spectroscopic observations of 41 obscured and intermediate class active galactic nuclei (AGN; type 2, 1.9 and 1.8; AGN2) with redshift z ≲ 0.1, selected from the Swift/Burst Alert Telescope 70-month catalogue. The observations have been carried out in the framework of a systematic study of the AGN2 near-infrared spectral properties and have been executed using Infrared Spectrometer And Array Camera/VLT, X-shooter/VLT and LUCI/LBT, reaching an average S/N ratio of ∼30 per resolution element. For those objects observed with X-shooter, we also obtained simultaneous optical and UV spectroscopy. We have identified a component from the broad line region in 13 out of 41 AGN2, with full width at half-maximum (FWHM) > 800 km s-1. We have verified that the detection of the broad line region components does not significantly depend on selection effects due to the quality of the spectra, the X-ray or near-infrared fluxes, the orientation angle of the host galaxy or the hydrogen column density measured in the X-ray band. The average broad line region components found in AGN2 has a significantly (a factor 2) smaller FWHM if compared with a control sample of type 1 AGN.
Volume
464
Issue
2
Start page
1783
Uri
Url
Issn Identifier
0035-8711
Ads BibCode
2017MNRAS.464.1783O
Rights
open.access
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