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

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          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 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.

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          Author and article information

          Journal
          02 June 2020
          Article
          2006.01700

          http://arxiv.org/licenses/nonexclusive-distrib/1.0/

          Custom metadata
          Submitted to MNRAS, 24 pages, 65 figures, 3 tables
          astro-ph.GA

          Galaxy astrophysics

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