A1 Refereed original research article in a scientific journal
The radio structure of the narrow-line Seyfert 1 Mrk 783 with VLBA and e-MERLIN
Authors: Congiu E, Kharb P, Tarchi A, Berton M, Caccianiga A, Chen S, Crepaldi L, Di Mille F, Järvelä E, Jarvis M E, La Mura G, Vietri A
Publication year: 2020
Journal: Monthly Notices of the Royal Astronomical Society
Volume: 499
Issue: 3
First page : 3149
Last page: 3157
Number of pages: 9
ISSN: 0035-8711
eISSN: 1365-2966
DOI: https://doi.org/10.1093/mnras/staa3024
Self-archived copy’s web address: https://research.utu.fi/converis/portal/detail/Publication/50366673
In this paper, we present the analysis of new radio and optical observations of the narrow-line Seyfert 1 galaxy Mrk 783. $1.6\, \mathrm{GHz}$ 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 $1.6\, \mathrm{GHz}$ (L band) and $5\, \mathrm{GHz}$ (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 ( ${\gt}10^6\, \mathrm{K}$ ) 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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