The radio structure of the narrow-line Seyfert 1 Mrk 783 with VLBA and e-MERLIN
Author
dc.contributor.author
Congiu, E.
Author
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Kharb, P.
Author
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Tarchi, A.
Author
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Berton, M.
Author
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Caccianiga, A.
Author
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Chen, S.
Author
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Crepaldi, L.
Author
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Di Mille, F.
Author
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Järvelä, E.
Author
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Jarvis, M. E.
Author
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Mura, G. la
Author
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Vietri, A.
Admission date
dc.date.accessioned
2021-06-16T19:50:48Z
Available date
dc.date.available
2021-06-16T19:50:48Z
Publication date
dc.date.issued
2020
Cita de ítem
dc.identifier.citation
MNRAS 499, 3149–3157 (2020)
es_ES
Identifier
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10.1093/mnras/staa3024
Identifier
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https://repositorio.uchile.cl/handle/2250/180154
Abstract
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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.