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  1. OA@INAF
  2. PRODOTTI RICERCA INAF
  3. 1 CONTRIBUTI IN RIVISTE (Journal articles)
  4. 1.01 Articoli in rivista
Please use this identifier to cite or link to this item: http://hdl.handle.net/20.500.12386/29507
Title: Radio jets in NGC 4151: where eMERLIN meets HST
Authors: Williams, D. R. A.
McHardy, I. M.
Baldi, R. D.
Beswick, R. J.
Argo, M. K.
Dullo, B. T.
Knapen, J. H.
Brinks, E.
Fenech, D. M.
Mundell, C. G.
Muxlow, T. W. B.
PANESSA, Francesca 
Rampadarath, H.
Westcott, J.
Issue Date: 2017
Journal: MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 
Number: 472
Issue: 4
First Page: 3842
Abstract: We present high-sensitivity eMERLIN radio images of the Seyfert galaxy NGC 4151 at 1.51 GHz. We compare the new eMERLIN images to those from archival MERLIN observations in 1993 to determine the change in jet morphology in the 22 yr between observations. We report an increase by almost a factor of 2 in the peak flux density of the central core component, C4, thought to host the black hole, but a probable decrease in some other components, possibly due to adiabatic expansion. The core flux increase indicates an active galactic nucleus (AGN) that is currently active and feeding the jet. We detect no significant motion in 22 yr between C4 and the component C3, which is unresolved in the eMERLIN image. We present a spectral index image made within the 512 MHz band of the 1.51 GHz observations. The spectrum of the core, C4, is flatter than that of other components further out in the jet. We use HST emission-line images (H α, [O III] and [O II]) to study the connection between the jet and the emission-line region. Based on the changing emission-line ratios away from the core and comparison with the eMERLIN radio jet, we conclude that photoionization from the central AGN is responsible for the observed emission-line properties further than 4 arcsec (360 pc) from the core, C4. Within this region, a body of evidence (radio-line co-spatiality, low [O III]/H α and estimated fast shocks) suggests additional ionization from the jet.
URI: http://hdl.handle.net/20.500.12386/29507
URL: https://academic.oup.com/mnras/article/472/4/3842/4097195
ISSN: 0035-8711
DOI: 10.1093/mnras/stx2205
Bibcode ADS: 2017MNRAS.472.3842W
Fulltext: open
Appears in Collections:1.01 Articoli in rivista

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