Radio-emitting narrow-line Seyfert 1 galaxies in the JVLA perspective

We report the first results of a survey on 74 narrow-line Seyfert 1 galaxies (NLS1s) carried out in 2015 with the Karl G. Jansky Very Large Array (JVLA) at 5 GHz in A-configuration. So far, this is the largest survey aimed to image the radio continuum of NLS1s. We produced radio maps in order to compare the general properties of three different samples of objects: radio-quiet NLS1s (RQNLS1s), steep-spectrum radio-loud NLS1s (S-NLS1s), and flat-spectrum radio-loud NLS1s (F-NLS1s). We find that the three classes correspond to different radio morphologies, with F-NLS1s being more compact, and RQNLS1s often showing diffuse emission on kpc scales. We also find that F-NLS1s might be low-luminosity and possibly young blazars, and that S-NLS1s are part of the parent population of F-NLS1s. Dedicated studies to RQNLS1s are needed to fully understand their role in the unification pictures.

Keywords

Galaxies: active, Galaxies: jets, Galaxies: Seyfert, Quasars: supermassive black holes

DOI

10.1051/0004-6361/201832612

Citation

Berton, M, Congiu, E, Järvelä, E, Antonucci, R, Kharb, P, Lister, M L, Tarchi, A, Caccianiga, A, Chen, S, Foschini, L, Lähteenmäki, A, Richards, J L, Ciroi, S, Cracco, V, Frezzato, M, La Mura, G & Rafanelli, P 2018, ' Radio-emitting narrow-line Seyfert 1 galaxies in the JVLA perspective ', Astronomy and Astrophysics, vol. 614, A87 . https://doi.org/10.1051/0004-6361/201832612

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https://urn.fi/URN:NBN:fi:aalto-201808014280

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[article-cris] Sähkötekniikan korkeakoulu / ELEC

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Radio-emitting narrow-line Seyfert 1 galaxies in the JVLA perspective

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