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Before the launch of the Fermi satellite only two classes of Active GalacticNuclei (AGN) were known to generate relativistic jets and thus to emit up tothe gamma-ray energy range: blazars and radio galaxies, both hosted in giantelliptical galaxies. The first four years of observations by the Large AreaTelescope (LAT) on board Fermi confirmed that these two populations representthe most numerous identified sources in the extragalactic gamma-ray sky, butthe discovery of variable gamma-ray emission from 5 radio-loud Narrow-LineSeyfert 1 (NLSy1) galaxies revealed the presence of a possible emerging thirdclass of AGN with relativistic jets. Considering that NLSy1 are thought to behosted in spiral galaxies, this finding poses intriguing questions about thenature of these objects, the knowledge of the development of relativistic jets,and the evolution of radio-loud AGN. In this context, the study of theradio-loud NLSy1 from radio to gamma-rays has received increasing attention.Here we discuss the radio-to-gamma-rays properties of the gamma-ray emittingNLSy1, also in comparison with the blazar scenario.

A panchromatic view of relativistic jets in gamma-ray emitting narrow-line Seyfert 1 galaxies