Radio-emitting narrow-line Seyfert 1 galaxies in the JVLA perspective
  We 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 in order
to fully understand their role in the unification pictures.
