An updated view on the parent population of $\gamma$-ray emitting narrow-line Seyfert 1 galaxies

Berton, M.

doi:10.22323/1.328.0026

Cited by 2 publications

(2 citation statements)

References 48 publications

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“…In this work, instead, we make use of a more rigorous classification based directly on the observed radio properties and morphology of the sources. The relativistic jets of NLS1s are usually rather compact [73,[87][88][89], although some exceptions are known (e.g., [90][91][92][93][94][95]). This has led some authors to suggest that NLS1s may be connected with classes of young radio galaxies such as compact steep-spectrum (CSS) sources and gigahertz-peaked sources (GPS) [38,89,[96][97][98][99][100][101][102].…”

Section: Origin Of the Bulk Outflowsmentioning

confidence: 99%

Jet-Induced Feedback in the [O III] Lines of Early Evolution Stage Active Galactic Nuclei

Berton

Järvelä

2021

Universe

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It is well known that active galactic nuclei (AGN) show various forms of interaction with their host galaxy, in a number of phenomena generally called AGN feedback. In particular, the relativistic plasma jets launched by a fraction of AGN can strongly affect their environment. We present here a study of the [O III] λλ4959,5007 lines in a diverse sample of early evolution stage AGN–specifically narrow-line Seyfert 1 galaxies. Radio imaging observations of all of the sources enable a division to jetted and non-jetted sources, and exploiting this we show that the ionized gas properties are significantly influenced by the presence of the jets, as we often find the [O III] lines (blue-)shifted with respect to their restframe wavelength. We also show how the radio morphology and the radio spectral index do not seem to play a role in the origin of the [O III] shifts, thus suggesting that the source inclination is not relevant to the lines displacement. We do not find a strong relation between the [O III] line properties and the bolometric luminosity, suggesting that within our sample radiatively driven outflows do not seem to have a significant contribution to the [O III] line kinematics. We finally suggest that [O III] shifts may be a good proxy to identify the presence of relativistic jets. Additional studies, especially with integral-field spectroscopy, will provide a deeper insight into the relation between jets and their environment in early evolution stage AGN.

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Section: Origin Of the Bulk Outflowsmentioning

confidence: 99%

Jet-Induced Feedback in the [O III] Lines of Early Evolution Stage Active Galactic Nuclei

Berton

Järvelä

2021

Universe

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“…An additional criterion for NLS1s is the presence of strong Fe II multiplets (Goodrich, 1989), although their presence is not always required, and the origin of the iron abundance and its physics are still not clear (Marziani et al, 2018b, Bon et al, 2019. Their steep X-ray spectral indexes (Boller et al, 1992) and the presence of relativistic jets in these AGN (Abdo et al, 2009a,b;Berton, 2018) further complicate the NLS1 picture.…”

Section: Introductionmentioning

confidence: 99%

Line shapes in narrow-line Seyfert 1 galaxies: a tracer of physical properties?

Berton¹,

Björklund²,

Lähteenmäki³

et al. 2020

caosp

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Line profiles can provide fundamental information on the physics of active galactic nuclei (AGN). In the case of narrow-line Seyfert 1 galaxies (NLS1s) this is of particular importance since past studies revealed how their permitted line profiles are well reproduced by a Lorentzian function instead of a Gaussian. This has been explained with different properties of the broadline region (BLR), which may present a more pronounced turbulent motions in NLS1s with respect to other AGN. We investigated the line profiles in a recent large NLS1 sample classified using SDSS, and we divided the sources into two subsamples according to their line shapes, Gaussian or Lorentzian. The line profiles clearly separate all the properties of NLS1s. Black hole mass, Eddington ratio, [O III], and Fe II strength are all very different in the Lorentzian and Gaussian samples. We interpret this in terms of evolution within the class of NLS1s. The Lorentzian sources may be the youngest objects, while Gaussian profiles may be typically associated to more evolved objects. Further detailed spectroscopic studies are needed to fully confirm our hypothesis.

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An updated view on the parent population of $\gamma$-ray emitting narrow-line Seyfert 1 galaxies

Cited by 2 publications

References 48 publications

Jet-Induced Feedback in the [O III] Lines of Early Evolution Stage Active Galactic Nuclei

Jet-Induced Feedback in the [O III] Lines of Early Evolution Stage Active Galactic Nuclei

Line shapes in narrow-line Seyfert 1 galaxies: a tracer of physical properties?

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