We report the discovery with Fermi /LAT of γ-ray emission from three radio-loud narrow-line Seyfert 1 galaxies: PKS 1502+036 ( z = 0.409), 1H 0323+342 ( z = 0.061), and PKS 2004 − 447 ( z = 0.24). In addition to PMN J0948+0022 ( z = 0.585), the first source of this type to be detected in γ rays, they may form an emerging new class of γ-ray active galactic nuclei (AGNs). These findings can have strong implications on our knowledge about relativistic jets and the unified model of the AGN.
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Abdo et al. (2009) studied this question.
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