Radio morphology of southern narrow-line Seyfert 1 galaxies with Very Large Array observations
Date Issued
2020
Author(s)
Chen, S.
•
Jarvela, E.
•
Crepaldi, L.
•
Zhou, M.
•
Ciroi, S.
•
Berton, M.
•
Kharb, P.
•
•
Gu, M.
•
•
Vietri, A.
Abstract
We present the results of new radio observations carried out with the Karl G.
Jansky Very Large Array C-configuration at 5.5 GHz for a sample of southern
narrow-line Seyfert 1 galaxies (NLS1s). This work increases the number of known
radio-detected NLS1s in the southern hemisphere, and confirms that the radio
emission of NLS1s is mainly concentrated in a central region at kpc-scale and
only a few sources show diffuse emission. In radio-quiet NLS1s, the radio
luminosity tends to be higher in steep-spectrum sources and be lower in
flat-spectrum sources, which is opposite to radio-loud NLS1s. This may be
because the radio emission of steep NLS1s is dominated by misaligned jets,
AGN-driven outflows, or star formation superposing on a compact core. Instead
the radio emission of flat NLS1s may be produced by a central core which has
not yet developed radio jets and outflows. We discover new NLS1s harboring
kpc-scale radio jets and confirm that a powerful jet does not require a
large-mass black hole to be generated. We also find sources dominated by star
formation. These NLS1s could be new candidates in investigating the radio
emission of different mechanisms.
Volume
498
Issue
1
Start page
1278
Issn Identifier
0035-8711
Ads BibCode
2020MNRAS.498.1278C
Rights
open.access
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