The radio structure of the narrow-line Seyfert 1 Mrk 783 with VLBA and e-MERLIN
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2020Metadata
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Congiu, E.
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The radio structure of the narrow-line Seyfert 1 Mrk 783 with VLBA and e-MERLIN
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Abstract
In this paper, we present the analysis of new radio and optical observations of the narrow-line Seyfert 1 galaxy Mrk 783. 1.6 GHz
observations performed with the e-MERLIN interferometer confirm the presence of the diffuse emission previously observed.
The Very Long Baseline Array (VLBA) also detects the nuclear source both at 1.6 GHz (L band) and 5 GHz (C band). While
the L-band image shows only an unresolved core, the C-band image shows the presence of a partially resolved structure at
a position angle of 60◦. The brightness temperature of the emission in both bands (>106 K) suggests that it is a pc-scale jet
produced by the active galactic nucleus. The relatively steep VLBA spectral index (αVLBA = 0.63 ± 0.03) is consistent with the
presence of optically thin emission on milliarcsecond scales. Finally, we investigated two possible scenarios that can result in
the misalignment between the kpc and pc-scale radio structure detected in the galaxy. We also analysed the optical morphology
of the galaxy, which suggests that Mrk 783 underwent a merging in relatively recent times.
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ANID project Basal
AFB-170002
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Artículo de publicación ISI Artículo de publicación SCOPUS
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MNRAS 499, 3149–3157 (2020)
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