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

Gamma-ray emission from Narrow-Line Seyfert 1 Galaxies and implications on the jets unification