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arxiv: 1704.03881 · v2 · pith:5HHFPDF3new · submitted 2017-04-12 · 🌌 astro-ph.GA

Kiloparsec-scale emission in the narrow-line Seyfert 1 galaxy Mrk 783

E. Congiu (1 , 2) , M. Berton (1 , M. Giroletti (3) , R. Antonucci (4) , A. Caccianiga (2) , P. Kharb (5) , M. L. Lister (6)
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L. Foschini (2) S. Ciroi (1) V. Cracco (1) M. Frezzato (1) E. J\"arvel\"a (7 8) G. La Mura (1) J. L. Richards (6) P. Rafanelli (1) ((1) Dipartimento di Fisica e Astronomia "G. Galilei" Universit\`a di Padova (2) INAF - Osservatorio Astronomico di Brera (LC) Italy (3) INAF - Istituto di Radioastronomia (4) Department of Physics University of California (5) National Centre for Radio Astrophysics - Tata Institute of Fundamental Research (6) Department of Physics Astronomy Purdue University (7) Aalto University Mets\"ahovi Radio Observatory (8) Aalto University Department of Electronics Nanoengineering)
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classification 🌌 astro-ph.GA
keywords emissionextendedcomponentradioseyfertgalaxynarrow-linenls1
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We present the first results of a radio survey of 79 narrow-line Seyfert 1 (NLS1) carried out with the Karl G. Jansky Very Large Array (JVLA) at 5 GHz in A configuration aimed at studying the radio properties of these sources. We report the detection of extended emission in one object: Mrk 783. This is intriguing, since the radio-loudness parameter R of this object is close to the threshold between radio-quiet and radio-loud active galactic nuclei (AGN). The galaxy is one of the few NLS1 showing such an extended emission at z < 0.1. The radio emission is divided in a compact core component and an extended component, observed on both sides of the nucleus and extending from 14 kpc south-east to 12 kpc north-west. There is no sign of a collimated jet, and the shape of the extended component is similar to those of some Seyfert galaxies. The properties of the emission are compatible with a relic produced by the intermittent activity cycle of the AGN.

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