# An orientation-based unification of young jetted AGN: the case of 3C 286

## TL;DR

This paper reviews the connection between young, low-mass AGN with relativistic jets, introduces 3C 286 as a new NLS1, and proposes an orientation-based unification model for NLS1s and CSS sources.

## Contribution

It presents the first classification of 3C 286 as an NLS1 and proposes a unification scheme linking NLS1s and CSS sources based on orientation.

## Key findings

- 3C 286 is classified as a NLS1 for the first time.
- A tentative orientation-based unification model for NLS1s and CSS sources.
- Low-mass AGN can produce powerful relativistic jets.

## 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 $\gamma$-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 10$^8$ M$_\odot$, indicated that also these low-mass AGN can produce powerful relativistic jets. The search for parent population of $\gamma$-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.