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

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arxiv 1801.03519 v2 pith:NJLF2QU5 submitted 2018-01-10 astro-ph.GA

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

M. Berton , E. Congiu , E. J\"arvel\"a , R. Antonucci , P. Kharb , M. L. Lister , A. Tarchi , A. Caccianiga
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S. Chen L. Foschini A. L\"ahteenm\"aki J.L. Richards S. Ciroi V. Cracco M. Frezzato G. La Mura P. Rafanelli
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classification astro-ph.GA
keywords nls1sf-nls1sradiorqnls1sdifferentfindgalaxiesjvla
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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 in order to fully understand their role in the unification pictures.

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Cited by 1 Pith paper

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    Bayesian fitting of an eccentric Keplerian orbit to the radio light curve of PKS 2131-021 gives e = 0.053 ± 0.015 without red noise but favors a circular orbit plus DRW noise with e < 0.15.