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

Author： 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.

Publisher： Edp Sciences

E-ISSN： 1432-0746|614|issue|A87-A87

ISSN： 0004-6361

Source： Astronomy & Astrophysics, Vol.614, Iss.issue, 2018-06, pp. : A87-A87

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Abstract

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.