AUTHOR=Berton Marco , Foschini Luigi , Caccianiga Alessandro , Ciroi Stefano , Congiu Enrico , Cracco Valentina , Frezzato Michele , La Mura Giovanni , Rafanelli Piero TITLE=An Orientation-Based Unification of Young Jetted AGN: The Case of 3C 286 JOURNAL=Frontiers in Astronomy and Space Sciences VOLUME=4 YEAR=2017 URL=https://www.frontiersin.org/journals/astronomy-and-space-sciences/articles/10.3389/fspas.2017.00008 DOI=10.3389/fspas.2017.00008 ISSN=2296-987X ABSTRACT=

In recent years, the old paradigm according to which only high-mass black holes can launch powerful relativistic jets in active galactic nuclei (AGN) has begun to crumble. The discovery of γ-rays coming from narrow-line Seyfert 1 galaxies (NLS1s), usually considered young and growing AGN harboring a central black hole with mass typically lower than 108 M⊙, indicated that also these low-mass AGN can produce powerful relativistic jets. The search for parent population of γ-ray emitting NLS1s revealed their connection with compact steep-spectrum sources (CSS). In this proceeding we present a review of the current knowledge of these sources, we present the new important case of 3C 286, classified here for the fist time as NLS1, and we finally provide a tentative orientation based unification of NLS1s and CSS sources.