Gamma-ray emission from Narrow-Line Seyfert 1 Galaxies and implications
  on the jets unification
  The recent discovery by Fermi/LAT of high-energy (E>100 MeV) gamma rays from
Narrow-Line Seyfert 1 Galaxies (NLS1s) made evident the existence of a third
class of gamma-ray emitting Active Galactic Nuclei (AGN), after blazars and
radio galaxies. It is now possible to study a rather unexplored range of low
masses (10^6-8 Msun) and high accretion rates (up to the Eddington limit) of
AGN with relativistic jets. A comparison with the jet emission from Galactic
compact objects shows some striking similarities, indicating that NLS1s are the
low-mass counterpart of blazars as neutron stars are the low-mass jet systems
analogue of stellar mass black holes.
