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Título: | The curious activity in the nucleus of NGC 4151: jet interaction causing variability? |
Autor: | Williams, David R. A.; Baldi, R.D.; McHardy, I. M.; Beswick, R. J.; Panessa, F.; May, D.; Moldón, Javier; Argo, M. K.; Bruni, G.; Dullo, B. T.; Knapen, J. H.; Brinks, E.; Fenech, D. M.; Mundell, C. G.; Muxlow, T. W. B.; Pahari, M.; Westcott, J. | Palabras clave: | Galaxies: active Galaxies: individual: NGC 4151 Galaxies: jets Galaxies: nuclei Quasars: emission lines Galaxies: Seyfert |
Fecha de publicación: | 2020 | Editor: | Oxford University Press | Citación: | Monthly Notices of the Royal Astronomical Society 495(3): 3079–3086 (2020) | Resumen: | A key characteristic of many active galactic nuclei (AGN) is their variability, but its origin is poorly understood, especially in the radio domain. Williams et al. (2017) reported a ∼50 per cent increase in peak flux density of the AGN in the Seyfert galaxy NGC 4151 at 1.5 GHz with the e-MERLIN array. We present new high resolution e-MERLIN observations at 5 GHz and compare these to archival MERLIN observations to investigate the reported variability. Our new observations allow us to probe the nuclear region at a factor three times higher-resolution than the previous e-MERLIN study. We separate the core component, C4, into three separate components: C4W, C4E and X. The AGN is thought to reside in component C4W, but this component has remained constant between epochs within uncertainties. However, we find that the Eastern-most component, C4E, has increased in peak flux density from 19.35±1.10 to 37.09±1.86 mJy/beam, representing a 8.2σ increase on the MERLIN observations. We attribute this peak flux density increase to continued interaction between the jet and the emission line region (ELR), observed for the first time in a low-luminosity AGN such as NGC 4151. We identify discrete resolved components at 5 GHz along the jet axis, which we interpret as areas of jet-ELR interaction.© 2020 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society | Versión del editor: | http://dx.doi.org/10.1093/mnras/staa1152 | URI: | http://hdl.handle.net/10261/213284 | DOI: | 10.1093/mnras/staa1152 | ISSN: | 0035-8711 |
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IAA_2020staa1152.pdf | 1,04 MB | Adobe PDF | Visualizar/Abrir |
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