Congiu, E.E.CongiuBerton, M.M.BertonGIROLETTI, MARCELLOMARCELLOGIROLETTIAntonucci, R.R.AntonucciCACCIANIGA, AlessandroAlessandroCACCIANIGAKharb, P.P.KharbLister, M. L.M. L.ListerFOSCHINI, LUIGILUIGIFOSCHINICiroi, S.S.CiroiCracco, V.V.CraccoFrezzato, M.M.FrezzatoJärvelä, E.E.JärveläLa Mura, G.G.La MuraRichards, J. L.J. L.RichardsRafanelli, P.P.Rafanelli2020-08-252020-08-2520170004-6361http://hdl.handle.net/20.500.12386/26803We present the first results of a radio survey of 79 narrow-line Seyfert 1 (NLS1) carried out with the Karl G. Jansky Very Large Array (JVLA) at 5 GHz in A configuration aimed at studying the radio properties of these sources. We report the detection of extended emission in one object: Mrk 783. This is intriguing, since the radio-loudness parameter R of this object is close to the threshold between radio-quiet and radio-loud active galactic nuclei (AGN). The galaxy is one of the few NLS1 showing such an extended emission at z < 0.1. The radio emission is divided into a compact core component and an extended component, observed on both sides of the nucleus and extending from 14 kpc southeast to 12 kpc northwest. There is no sign of a collimated jet and the shape of the extended component is similar to those of some Seyfert galaxies. The properties of the emission are compatible with a relic produced by the intermittent activity cycle of the AGN.STAMPAenArticle10.1051/0004-6361/2017306162-s2.0-85022330231000406619100120https://www.aanda.org/articles/aa/abs/2017/07/aa30616-17/aa30616-17.html2017A&A...603A..32CFIS/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