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Relativistic Jets in Gamma-Ray-Emitting Narrow-Line Seyfert 1 Galaxies

INAF—Istituto di Radioastronomia, Via P. Gobetti 101, I-40129 Bologna, Italy
Galaxies 2019, 7(4), 87; https://doi.org/10.3390/galaxies7040087
Received: 8 September 2019 / Revised: 31 October 2019 / Accepted: 4 November 2019 / Published: 7 November 2019
(This article belongs to the Special Issue Particle Acceleration Processes in Astrophysical Jets)
Before the launch of the Fermi Gamma-ray Space Telescope satellite only two classes of active galactic nuclei (AGN) were known to generate relativistic jets and thus to emit up to the γ -ray energy range: blazars and radio galaxies, both hosted in giant elliptical galaxies. The discovery by the Large Area Telescope (LAT) on-board the Fermi satellite of variable γ -ray emission from a few radio-loud narrow-line Seyfert 1 galaxies (NLSy1) revealed the presence of an emerging third class of AGN with powerful relativistic jets. Considering that NLSy1 are usually hosted in late-type galaxies with relatively small black hole masses, this finding opened new challenging questions about the nature of these objects, the disc/jet connection, the emission mechanisms at high energies, and the formation of relativistic jets. In this review, I will discuss the broad-band properties of the γ -ray-emitting NLSy1 included in the Fourth Fermi LAT source catalog, highlighting major findings and open questions regarding jet physics, black hole mass estimation, host galaxy and accretion process of these sources in the Fermi era. View Full-Text
Keywords: relativistic jet; gamma-rays; X-rays; optical; radio; emission mechanism; Seyfert galaxy; super-massive black hole; host galaxy relativistic jet; gamma-rays; X-rays; optical; radio; emission mechanism; Seyfert galaxy; super-massive black hole; host galaxy
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D’Ammando, F. Relativistic Jets in Gamma-Ray-Emitting Narrow-Line Seyfert 1 Galaxies. Galaxies 2019, 7, 87.

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