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arXiv:2006.01700 [astro-ph.GA]AbstractReferencesReviewsResources

Radio morphology of southern narrow-line Seyfert 1 galaxies with the JVLA observations

S. Chen, E. Jarvela, L. Crepaldi, M. Zhou, S. Ciroi, M. Berton, P. Kharb, L. Foschini, M. Gu, G. La Mura, A. Vietri

Published 2020-06-02Version 1

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 RQ NLS1s, the radio luminosity tends to be higher in steep-spectrum sources and be lower in flat-spectrum sources, which is opposite to RL 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.

Comments: Submitted to MNRAS, 24 pages, 65 figures, 3 tables
Categories: astro-ph.GA
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