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A Panchromatic View of Relativistic Jets in Narrow-Line Seyfert 1 Galaxies

Dipartimento di Fisica e Astronomia, Universitá degli Studi di Bologna, Viale Berti Pichat 6/2, Bologna 40127, Italy
INAF - Istituto di Radioastronomia, Via Gobetti 101, Bologna 40129, Italy
U.S. Naval Research Laboratory, Code 7653, 4555 Overlook Ave. SW, Washington, DC 20375-5352, USA
KTH, Department of Physics, and the Oskar Klein Centre, AlbaNova, SE-106 91 Stockholm, Sweden
INAF - Osservatorio Astrofisico di Torino, Via Osservatorio 20, I-10025 Pino Torinese (TO), Italy
Author to whom correspondence should be addressed.
Academic Editors: Jose L. Gómez, Alan P. Marscher and Svetlana G. Jorstad
Galaxies 2016, 4(3), 11;
Received: 15 July 2016 / Revised: 16 August 2016 / Accepted: 18 August 2016 / Published: 25 August 2016
(This article belongs to the Special Issue Blazars through Sharp Multi-wavelength Eyes)
The discovery by the Large Area Telescope on board Fermi of variable γ-ray emission from radio-loud narrow-line Seyfert 1 (NLSy1) galaxies revealed the presence of a possible third class of Active Galactic Nuclei (AGN) with relativistic jets in addition to blazars and radio galaxies. Considering that NLSy1 are usually hosted in spiral galaxies, this finding poses intriguing questions about the nature of these objects and the formation of relativistic jets. We report on a systematic investigation of the γ-ray properties of a sample of radio-loud NLSy1, including the detection of new objects, using 7 years of Fermi-LAT data with the new Pass 8 event-level analysis. In addition we discuss the radio-to-very-high-energy properties of the γ-ray emitting NLSy1, their host galaxy, and black hole mass in the context of the blazar scenario and the unification of relativistic jets at different scales. View Full-Text
Keywords: galaxies: nuclei; galaxies: jets; galaxies: Seyfert; gamma-rays: general galaxies: nuclei; galaxies: jets; galaxies: Seyfert; gamma-rays: general
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D’Ammando, F.; Orienti, M.; Finke, J.; Larsson, J.; Giroletti, M.; Raiteri, C.M. A Panchromatic View of Relativistic Jets in Narrow-Line Seyfert 1 Galaxies. Galaxies 2016, 4, 11.

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