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Until recently, relativistic jets were ubiquitously found to be launched fromgiant elliptical galaxies. However, the detection by the Fermi-LAT of gamma-rayemission from radio-loud narrow-line Seyfert 1 (RL-NLSy1) galaxies raiseddoubts on this relation. Here, we morphologically characterize a sample of 29RL-NLSy1s (including 12 gamma-ray emitters, gamma-NLSy1s) in order to findclues on the conditions needed by AGN to produce relativistic jets. We use deepnear-infrared images from the Nordic Optical Telescope and the ESO VLT toanalyze the surface brightness distribution of the galaxies in the sample. Wedetected 72% of the hosts (24% classified as gamma-NLSy1s). Although we cannotrule out that some RL-NLSy1s are hosted by dispersion supported systems, ourfindings strongly indicate that RL-NLSy1s hosts are preferentially discgalaxies. 52% of the resolved hosts (77% non-gamma-emitters and 20%gamma-emitters) show bars with morphological properties (long and weak)consistent with models that promote gas inflows, which might trigger nuclearactivity. The extremely red bulges of the gamma-NLSy1s, and features thatsuggest minor mergers in 75% of their hosts might hint to the necessaryconditions for gamma-rays to be produced. Among the features that suggestmergers in our sample, we find 6 galaxies that show offset stellar bulges withrespect to their AGN. When we plot the nuclear versus the bulge magnitude,RL-NLSy1s locate in the low-luminosity end of flat-spectrum radio quasars(FSRQs), suggesting a similar accretion mode between these two AGN types.

The disc-like host galaxies of radio-loud Narrow-Line Seyfert 1s