Berton, M.M.BertonCongiu, E.E.CongiuJärvelä, E.E.JärveläAntonucci, R.R.AntonucciKharb, P.P.KharbLister, M. L.M. L.ListerTARCHI, ANDREAANDREATARCHICACCIANIGA, AlessandroAlessandroCACCIANIGAChen, S.S.ChenFOSCHINI, LUIGILUIGIFOSCHINILähteenmäki, A.A.LähteenmäkiRichards, J. L.J. L.RichardsCiroi, S.S.CiroiCracco, V.V.CraccoFrezzato, M.M.FrezzatoLa Mura, G.G.La MuraRafanelli, P.P.Rafanelli2020-10-262020-10-2620180004-6361http://hdl.handle.net/20.500.12386/28008We report the first results of a survey on 74 narrow-line Seyfert 1 galaxies (NLS1s) carried out in 2015 with the Karl G. Jansky Very Large Array (JVLA) at 5 GHz in A-configuration. So far, this is the largest survey aimed to image the radio continuum of NLS1s. We produced radio maps in order to compare the general properties of three different samples of objects: radio-quiet NLS1s (RQNLS1s), steep-spectrum radio-loud NLS1s (S-NLS1s), and flat-spectrum radio-loud NLS1s (F-NLS1s). We find that the three classes correspond to different radio morphologies, with F-NLS1s being more compact, and RQNLS1s often showing diffuse emission on kpc scales. We also find that F-NLS1s might be low-luminosity and possibly young blazars, and that S-NLS1s are part of the parent population of F-NLS1s. Dedicated studies to RQNLS1s are needed to fully understand their role in the unification pictures. <P />The reduced images (FITS files) are only available at the CDS via anonymous ftp to <A href="https://cdsarc.u-strasbg.fr">http://cdsarc.u-strasbg.fr</A> (ftp://130.79.128.5) or via <A href="https://cdsarc.u-strasbg.fr/viz-bin/qcat?J/A+A/614/A87">http://cdsarc.u-strasbg.fr/viz-bin/qcat?J/A+A/614/A87</A>STAMPAenArticle10.1051/0004-6361/2018326122-s2.0-85049208338000435606800007https://www.aanda.org/articles/aa/abs/2018/06/aa32612-18/aa32612-18.html2018A&A...614A..87BFIS/05 - ASTRONOMIA E ASTROFISICAERC sectors::Physical Sciences and Engineering::PE9 Universe sciences: astro-physics/chemistry/biology; solar systems; stellar, galactic and extragalactic astronomy, planetary systems, cosmology, space science, instrumentation::PE9_6 Stars and stellar systems