Peaked sources and narrow-line Seyfert 1s: a love story

Autor:	Berton, Marco, Järvelä, Emilia
Rok vydání:	2021
Předmět:	Astrophysics - Astrophysics of Galaxies Astrophysics - High Energy Astrophysical Phenomena
Druh dokumentu:	Working Paper
DOI:	10.1002/asna.20210036
Popis:	The first similarities between peaked sources (PS) and narrow-line Seyfert 1 (NLS1) galaxies were noticed already twenty years ago. Nowadays, it is known that several sources can share both classifications, and that part of the parent population of $\gamma$-ray emitting NLS1s could be hiding among PS. In this brief review, we describe how and why this orientation-based unification was developed. We also show how the recent discovery of absorbed radio jets in NLS1s, basically invisible at frequencies below 10 GHz, could impact our knowledge of PS and, in particular, render the widely used radio-loudness parameter obsolete. Comment: 4 pages, accepted for publication on Astronomische Nachrichten, Special Issue "6th Workshop on Compact Steep-Spectrum and GHz-peaked spectrum radio sources"
Databáze:	arXiv
Externí odkaz:	http://arxiv.org/abs/2110.02973 Zobrazit plný text záznamu View this record from Arxiv