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

Research output: Contribution to journalArticleScientificpeer-review


  • M. Berton
  • E. Congiu
  • Emilia Järvelä

  • R. Antonucci
  • P. Kharb
  • M. L. Lister
  • A. Tarchi
  • A. Caccianiga
  • S. Chen
  • L. Foschini
  • Anne Lähteenmäki

  • J. L. Richards
  • S. Ciroi
  • V. Cracco
  • M. Frezzato
  • G. La Mura
  • P. Rafanelli

Research units

  • Università Degli Studi di Padova
  • Osservatorio Astronomico di Brera
  • University of California at Santa Barbara
  • Tata Institute of Fundamental Research
  • Purdue University
  • National Institute for Astrophysics
  • Guangzhou University
  • Tartu Observatory
  • INAF - Osservatorio Astronomico di Padova
  • INFN, Sezione di Padova


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.


Original languageEnglish
Article numberA87
JournalAstronomy and Astrophysics
Publication statusPublished - 1 Jun 2018
MoE publication typeA1 Journal article-refereed

    Research areas

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

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