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

Marco Berton*, Irene Björklund, Anne Lähteenmäki, E. Congiu, Emilia Järvelä, G. Terreran, G. La Mura

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

5 Citations (Scopus)
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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.

Original languageEnglish
Pages (from-to)270-292
Number of pages23
JournalContributions of the Astronomical Observatory Skalnate Pleso
Issue number1
Publication statusPublished - 1 Jan 2020
MoE publication typeA1 Journal article-refereed
EventSerbian Conference on Spectral Line Shapes in Astrophysics - Vrdnik, Serbia
Duration: 3 Jun 20197 Jun 2019
Conference number: 12


  • Galaxies: active
  • Galaxies: evolution
  • Line: profiles
  • Quasars: emission lines

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