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We report the discovery by the Large Area Telescope (LAT) onboard the FermiGamma-ray Space Telescope of high-energy gamma-ray emission from the peculiarquasar PMN J0948+0022 (z=0.585+/-0.001). Contrary to the expectations, theoptical spectrum of this quasar shows only narrow lines [FWHM(Hbeta) ~ 1500km/s] and the typical characteristics of narrow-line Seyfert 1 type galaxies.However, the strong radio emission and the flat spectrum suggest the presenceof a relativistic jet, which can now be confirmed by the detection of MeV-GeVphotons. PMN J0948+0022 is therefore the first radio-loud narrow-line Seyfert 1quasar to be detected at gamma-rays and the third type of gamma-ray emittingAGN, after blazars and radiogalaxies.

Fermi/LAT discovery of gamma-ray emission from a relativistic jet in the narrow-line Seyfert 1 quasar PMN J0948+0022