Kiloparsec-scale emission in the narrow-line Seyfert 1 galaxy Mrk 783
  We 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 in a compact core component and an extended
component, observed on both sides of the nucleus and extending from 14 kpc
south-east to 12 kpc north-west. 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.
