A1 Refereed original research article in a scientific journal
Evidence of bar-driven secular evolution in the gamma-ray narrow-line Seyfert 1 galaxy FBQS J164442.5+261913
Authors: A. Olguin-Iglesias, J. K. Kotilainen, J. León Tavares, V. Chavushyan, C. Añorve
Publisher: OXFORD UNIV PRESS
Publication year: 2017
Journal: Monthly Notices of the Royal Astronomical Society
Journal name in source: MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Journal acronym: MON NOT R ASTRON SOC
Volume: 467
Issue: 3
First page : 3712
Last page: 3722
Number of pages: 11
ISSN: 0035-8711
eISSN: 1365-2966
DOI: https://doi.org/10.1093/mnras/stx022
Self-archived copy’s web address: https://research.utu.fi/converis/portal/detail/Publication/20500449
We present near-infrared imaging of FBQS J164442.5+261913, one of the few gamma-ray emitting narrowline Seyfert 1 galaxies detected at high significance level by Fermi Large Area Telescope. This study is the first morphological analysis performed of this source and the third performed of this class of objects. Conducting a detailed 2D modelling of its surface brightness distribution and analysing its J - K-s colour gradients, we find that FBQS J164442.5+261913 is statistically most likely hosted by a barred lenticular galaxy (SB0). We find evidence that the bulge in the host galaxy of FBQS J164442.5+261913 is not classical but pseudo, against the paradigm of powerful relativistic jets exclusively launched by giant ellipticals. Our analysis also reveals the presence of a ring with diameter equalling the bar length (r(bar) = 8.13 +/- 0.25 kpc), whose origin might be a combination of bar- driven gas rearrangement and minor mergers, as revealed by the apparent merger remnant in the J-band image. In general, our results suggest that the prominent bar in the host galaxy of FBQS J164442.5+ 261913 has mostly contributed to its overall morphology driving a strong secular evolution, which plays a crucial role in the onset of the nuclear activity and the growth of the massive bulge. Minor mergers, in conjunction, are likely to provide the necessary fresh supply of gas to the central regions of the host galaxy.
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