Details

Autor(en) / Beteiligte

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

Titel

Radio morphology of southern narrow-line Seyfert 1 galaxies with Very Large Array observations

Ist Teil von

• Monthly notices of the Royal Astronomical Society, 2020-10, Vol.498 (1), p.1278-1297

Ort / Verlag

Oxford University Press

Erscheinungsjahr

2020

Quelle

Elektronische Zeitschriftenbibliothek

Beschreibungen/Notizen

• 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, active galactic nucleus driven outflows, or star formation superposing on a compact core. Instead the radio emission of flat NLS1s may be produced by a central core that has not yet developed radio jets and outflows. We discover new NLS1s harbouring 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.