Refereed journal article or data article (A1)

The disc-like host galaxies of radio-loud narrow-line Seyfert 1s




List of AuthorsAlejandro Olguín-Iglesias, Jari Kotilainen, Vahram Chavushyan

PublisherOXFORD UNIV PRESS

Publication year2020

JournalMonthly Notices of the Royal Astronomical Society

Journal name in sourceMONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY

Journal acronymMON NOT R ASTRON SOC

Volume number492

Issue number1

Start page1450

End page1464

Number of pages15

ISSN0035-8711

eISSN1365-2966

DOIhttp://dx.doi.org/10.1093/mnras/stz3549

Self-archived copy’s web addresshttps://research.utu.fi/converis/portal/detail/Publication/46076987


Abstract
Until recently, relativistic jets were ubiquitously found to be launched from giant elliptical galaxies. However, the detection by the Fermi-LAT of gamma-ray emission from radio-loud narrow-line Seyfert 1 (RL-NLSy1) galaxies raised doubts on this relation. Here, we morphologically characterize a sample of 29 RL-NLSy1s (including 12 gamma-emitters, gamma-NLSy1s) in order to find clues on the conditions needed by active galactic nuclei (AGNs) to produce relativistic jets. We use deep near-infrared images from the Nordic Optical Telescope and the ESO VLT to analyse the surface brightness distribution of the galaxies in the sample. We detected 72 per cent of the hosts (24 per cent classified as gamma-NLSy1s). Although we cannot rule out that some RL-NLSy1s are hosted by dispersion-supported systems, our findings strongly indicate that RL-NLSy1 hosts are preferentially disc galaxies. 52 per cent of the resolved hosts (77 per cent non-gamma-emitters and 20 per cent gamma-emitters) show bars with morphological properties (long and weak) consistent with models that promote gas inflows, which might trigger nuclear activity. The extremely red bulges of the gamma-NLSy1s, and features that suggest minor mergers in 75 per cent of their hosts, might hint to the necessary conditions for gamma-rays to be produced. Among the features that suggest mergers in our sample, we find six galaxies that show offset stellar bulges with respect to their AGNs. When we plot the nuclear versus the bulge magnitude, RL-NLSy1s locate in the low-luminosity end of flat spectrum radio quasars, suggesting a similar accretion mode between these two AGN types.

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Last updated on 2022-07-04 at 17:48