  A fraction of Narrow Line Seyfert 1 galaxies (NLS1) are hosted by galaxies
that present a disturbed morphology, in some cases hinting for merger
processes, that are putative sources of gas replenishment. We have been
investigating the poorly studied population of radio loud NLS1 (RL-NLS1)
showing a flat radio spectrum, assumed to be the manifestation of the presence
of a radio jet. In some of the objects the infrared emission is well fitted by
a combination of an AGN component and an "active" host galaxy component like
M82, the estimate SFR being in the LIRG/ULIRG range (10-500 Msun/year). In
order to better characterize that component, we have been investigating the
sub-millimeter/millimeter emission of the sources using APEX. Here we present
the results concerning a pilot sample of 2 representative objects.
