The radio structure of the narrow-line Seyfert 1 Mrk 783 with VLBA and e-MERLIN
| Autor: | Andrea Tarchi, Marco Berton, A. Vietri, Emilia Järvelä, G. La Mura, Sina Chen, L. Crepaldi, Alessandro Caccianiga, M. E. Jarvis, F. Di Mille, Enrico Congiu, Preeti Kharb |
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| Přispěvatelé: | Universidad de Chile, Tata Institute of Fundamental Research, National Institute for Astrophysics, Metsähovi Radio Observatory, INAF/IASF Milano, Technion-Israel Institute of Technology, University of Padova, Carnegie Institution of Washington, European Space Astronomy Centre, Max-Planck-Institut für Astrophysik, Aalto-yliopisto, Aalto University, ITA, DEU, ESP, CHL, FIN, IND, ISR, PRT |
| Rok vydání: | 2020 |
| Předmět: |
Physics
Seyfert [Galaxies] Spectral index 010308 nuclear & particles physics Astrophysics::High Energy Astrophysical Phenomena FOS: Physical sciences individual: Mrk 783 [Galaxies] Astronomy and Astrophysics galaxies [Radio continuum] Astrophysics::Cosmology and Extragalactic Astrophysics Astrophysics Position angle Astrophysics - Astrophysics of Galaxies 01 natural sciences Galaxy Interferometry Space and Planetary Science Astrophysics of Galaxies (astro-ph.GA) Brightness temperature 0103 physical sciences 010303 astronomy & astrophysics Astrophysics::Galaxy Astrophysics Very Long Baseline Array MERLIN Line (formation) |
| Zdroj: | MNRAS |
| ISSN: | 1365-2966 0035-8711 |
| DOI: | 10.1093/mnras/staa3024 |
| Popis: | 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{\deg}. The brightness temperature of the emission in both bands ($>10^6$ K) suggests that it is a pc-scale jet produced by the AGN. The relatively steep VLBA spectral index ($\alpha_{VLBA} = 0.63\pm0.03$) 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. Comment: 10 pages, 6 figures, accepted for publication on MNRAS |
| Databáze: | OpenAIRE |
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