Published in
Astronomy & Astrophysics, (614), p. A87, 2018
DOI: 10.1051/0004-6361/201832612
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Radio-emitting narrow-line Seyfert 1 galaxies in the JVLA perspective
,
E. Congiu,
E. Järvelä,
R. Antonucci,
P. Kharb,
M. L. Lister,
A. Tarchi,
A. Caccianiga ,
S. Chen,
L. Foschini ,
A. Lähteenmäki,
J. L. Richards,
S. Ciroi,
V. Cracco,
M. Frezzato
and other authors.
Full text: Unavailable
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.
