Radio jets and gamma-ray emission in radio-silent narrow-line Seyfert 1 galaxies

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Journal Title
Journal ISSN
Volume Title
A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
Date
2018-06-01
Major/Subject
Mcode
Degree programme
Language
en
Pages
6
Series
Astronomy and Astrophysics, Volume 614
Abstract
We have detected six narrow-line Seyfert 1 (NLS1) galaxies at 37 GHz that were previously classified as radio silent and two that were classified as radio quiet. These detections reveal the presumption that NLS1 galaxies labelled radio quiet or radio silent and hosted by spiral galaxies are unable to launch jets to be incorrect. The detections are a plausible indicator of the presence of a powerful, most likely relativistic jet because this intensity of emission at 37 GHz cannot be explained by, for example, radiation from supernova remnants. Additionally, one of the detected NLS1 galaxies is a newly discovered source of gamma rays and three others are candidates for future detections.
Description
Keywords
Galaxies: active, Galaxies: Seyfert, Gamma rays: galaxies
Other note
Citation
Lähteenmäki , A , Järvelä , E , Ramakrishnan , V , Tornikoski , M , Tammi , J , Vera , R J C & Chamani , W 2018 , ' Radio jets and gamma-ray emission in radio-silent narrow-line Seyfert 1 galaxies ' , Astronomy and Astrophysics , vol. 614 , L1 . https://doi.org/10.1051/0004-6361/201833378