A1 Refereed original research article in a scientific journal
Peaked sources and narrow-line Seyfert 1s: A love story
Authors: Berton Marco, Järvelä Emilia
Publisher: WILEY-V C H VERLAG GMBH
Publication year: 2021
Journal: Astronomical Notes / Astronomische Nachrichten
Journal acronym: ASTRON NACHR
Volume: 342
Issue: 9-10
First page : 1066
Last page: 1070
Number of pages: 5
ISSN: 0004-6337
eISSN: 1521-3994
DOI: https://doi.org/10.1002/asna.20210036
Web address : https://onlinelibrary.wiley.com/doi/10.1002/asna.20210036
Self-archived copy’s web address: https://research.utu.fi/converis/portal/detail/Publication/68302204
The first similarities between peaked sources (PS) and narrow-line Seyfert 1 (NLS1) galaxies were noticed already 20 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.
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