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A New Sample of Gamma-Ray Emitting Jetted Active Galactic Nuclei—Preliminary Results
Article

Optical Singly-Ionized Iron Emission in Radio-Quiet and Relativistically Jetted Active Galactic Nuclei

by 1,*, 2,3,4,†, 5,6,7,‡ and 8
1
National Institute for Astrophysics (INAF), Astronomical Observatory of Padova, IT-35122 Padova, Italy
2
European Southern Observatory (ESO), Alonso de Córdova 3107, Casilla 19, Santiago 19001, Chile
3
Finnish Centre for Astronomy with ESO (FINCA), University of Turku, Vesilinnantie 5, FI-20014 Turku, Finland
4
Aalto University Metsähovi Radio Observatory, Metsähovintie 114, FI-02540 Kylmälä, Finland
5
Center for Theoretical Physics, Polish Academy of Sciences, Al. Lotników 32/46, 02-668 Warsaw, Poland
6
Nicolaus Copernicus Astronomical Center, Polish Academy of Sciences, ul. Bartycka 18, 00-716 Warsaw, Poland
7
Laboratório Nacional de Astrofísica, R. dos Estados Unidos, 154-Nações, Itajubá 37504-364, MG, Brazil
8
Belgrade Astronomical Observatory, Volgina 7, 11060 Belgrade, Serbia
*
Author to whom correspondence should be addressed.
ESO fellow.
CNPq fellow.
Academic Editor: Nico Cappelluti
Universe 2021, 7(12), 484; https://doi.org/10.3390/universe7120484
Received: 19 October 2021 / Revised: 18 November 2021 / Accepted: 1 December 2021 / Published: 8 December 2021
(This article belongs to the Special Issue Panchromatic View of the Life-Cycle of AGN)
The issue of the difference between optical and UV properties of radio-quiet and radio-loud (relativistically “jetted”) active galactic nuclei (AGN) is a long standing one, related to the fundamental question of why a minority of powerful AGN possess strong radio emission due to relativistic ejections. This paper examines a particular aspect: the singly-ionized iron emission in the spectral range 4400–5600 Å, where the prominent HI Hβ and [Oiii]λλ4959,5007 lines are also observed. We present a detailed comparison of the relative intensity of Feii multiplets in the spectral types of the quasar main sequence where most jetted sources are found, and afterwards discuss radio-loud narrow-line Seyfert 1 (NLSy1) nuclei with γ-ray detection and with prominent Feii emission. An Feii template based on I Zw 1 provides an accurate representation of the optical Feii emission for RQ and, with some caveats, also for RL sources. CLOUDY photoionization simulations indicate that the observed spectral energy distribution can account for the modest Feii emission observed in composite radio-loud spectra. However, spectral energy differences alone cannot account for the stronger Feii emission observed in radio-quiet sources, for similar physical parameters. As for RL NLSy1s, they do not seem to behave like other RL sources, likely because of their different physical properties, that could be ultimately associated with a higher Eddington ratio. View Full-Text
Keywords: active galactic nuclei; optical spectroscopy; ionized gas; broad line region active galactic nuclei; optical spectroscopy; ionized gas; broad line region
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MDPI and ACS Style

Marziani, P.; Berton, M.; Panda, S.; Bon, E. Optical Singly-Ionized Iron Emission in Radio-Quiet and Relativistically Jetted Active Galactic Nuclei. Universe 2021, 7, 484. https://doi.org/10.3390/universe7120484

AMA Style

Marziani P, Berton M, Panda S, Bon E. Optical Singly-Ionized Iron Emission in Radio-Quiet and Relativistically Jetted Active Galactic Nuclei. Universe. 2021; 7(12):484. https://doi.org/10.3390/universe7120484

Chicago/Turabian Style

Marziani, Paola, Marco Berton, Swayamtrupta Panda, and Edi Bon. 2021. "Optical Singly-Ionized Iron Emission in Radio-Quiet and Relativistically Jetted Active Galactic Nuclei" Universe 7, no. 12: 484. https://doi.org/10.3390/universe7120484

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