Astronomy and Astrophysics – Astrophysics – Cosmology and Extragalactic Astrophysics
Scientific paper
2009-08-23
"Accretion and Ejection in AGN: A global view", ASP Conference Proceedings vol. 427, (2010), p. 243
Astronomy and Astrophysics
Astrophysics
Cosmology and Extragalactic Astrophysics
6 pages, 2 figures. Proceedings of the conference "Accretion and ejection in AGN: a global view" (Como, 22-26 June 2009)
Scientific paper
We report the discovery by the Large Area Telescope (LAT) onboard the Fermi Gamma-ray Space Telescope of high-energy gamma-ray emission from the peculiar quasar PMN J0948+0022 (z=0.585+/-0.001). Contrary to the expectations, the optical spectrum of this quasar shows only narrow lines [FWHM(Hbeta) ~ 1500 km/s] and the typical characteristics of narrow-line Seyfert 1 type galaxies. However, the strong radio emission and the flat spectrum suggest the presence of a relativistic jet, which can now be confirmed by the detection of MeV-GeV photons. PMN J0948+0022 is therefore the first radio-loud narrow-line Seyfert 1 quasar to be detected at gamma-rays and the third type of gamma-ray emitting AGN, after blazars and radiogalaxies.
Angelakis Emmanouil
for the Fermi LAT Collaboration
Foschini Luca
Ghisellini Gabriele
Maraschi Laura
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