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http://hdl.handle.net/20.500.12386/30995
Titolo: | Radio morphology of southern narrow-line Seyfert 1 galaxies with Very Large Array observations | Autori: | Chen, S. Jarvela, E. Crepaldi, L. Zhou, M. Ciroi, S. Berton, M. Kharb, P. FOSCHINI, LUIGI Gu, M. La Mura, G. Vietri, A. |
Data pubblicazione: | 2020 | Rivista: | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | Numero: | 498 | Fascicolo: | 1 | Da pagina:: | 1278 | 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. | URI: | http://hdl.handle.net/20.500.12386/30995 | URL: | https://academic.oup.com/mnras/article/498/1/1278/5896459 http://arxiv.org/abs/2006.01700v2 |
ISSN: | 0035-8711 | DOI: | 10.1093/mnras/staa2373 | Bibcode ADS: | 2020MNRAS.498.1278C | Fulltext: | open |
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