Optical Properties of Two Complementary Samples of Intermediate Seyfert Galaxies

We present first results of the analysis of optical spectra of two complementary samples of Seyfert galaxies (Seyferts). The first sample was extracted from a selection of the 4th Fermi Gamma-ray Large Area Telescope (4FGL) catalog and consists of 11 γ-ray-emitting jetted Seyfert galaxies. The secon...

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Bibliographic Details
Published in:Physics (Online) 2023-12, Vol.5 (4), p.1061-1080
Main Authors: Dalla Barba, Benedetta, Berton, Marco, Foschini, Luigi, La Mura, Giovanni, Vietri, Amelia, Ciroi, Stefano
Format: Article
Language:English
Subjects:
Active galactic nuclei
AGN
Classification
Emission analysis
Gamma rays
intermediate Seyfert
Optical properties
optical spectroscopy
Seyfert galaxies
Stars & galaxies
Viewing
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Summary:We present first results of the analysis of optical spectra of two complementary samples of Seyfert galaxies (Seyferts). The first sample was extracted from a selection of the 4th Fermi Gamma-ray Large Area Telescope (4FGL) catalog and consists of 11 γ-ray-emitting jetted Seyfert galaxies. The second one was extracted from the Swift-BAT AGN Spectroscopic Survey (BASS) and is composed of 38 hard-X-ray-selected active galactic nuclei (AGN). These two samples are complementary, with the former being expected to have smaller viewing angles, while the latter may include objects with larger viewing angles. We measured emission-line ratios to investigate whether the behavior of these Seyferts can be explained in terms of obscuration, as suggested by the Unified Model (UM) of AGN, or if there are intrinsic differences due to the presence of jets or outflows, or due to evolution. We found no indications of intrinsic differences. The UM remains the most plausible interpretation for these classes of objects, even if some results can be challenging for this model.
ISSN:2624-8174
2624-8174
DOI:10.3390/physics5040069