The radio structure of the narrow-line Seyfert 1 Mrk 783 with VLBA and e-MERLIN

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Journal Title
Journal ISSN
Volume Title
A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
Date
2020-12-01
Major/Subject
Mcode
Degree programme
Language
en
Pages
9
3149-3157
Series
Monthly Notices of the Royal Astronomical Society, Volume 499, issue 3
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.
Description
Keywords
Galaxies: individual: Mrk 783, Galaxies: Seyfert, Radio continuum: galaxies
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Citation
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 2020 , ' The radio structure of the narrow-line Seyfert 1 Mrk 783 with VLBA and e-MERLIN ' , Monthly Notices of the Royal Astronomical Society , vol. 499 , no. 3 , pp. 3149-3157 . https://doi.org/10.1093/mnras/staa3024