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Free–free absorption in the Seyfert nucleus of NGC 4151 |
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| Authors: | A Pedlar B Fernandez N G Hamilton M P Redman & P E Dewdney |
| Institution: | Nuffield Radio Astronomy Laboratories, University of Manchester, Jodrell Bank, Macclesfield, Cheshire SK11 9DL,;Department of Physics &38;Astronomy, University of Manchester, Oxford Road, Manchester M13 9PL,;Dominion Radio Astrophysical Observatory, Herzberg Institute of Astrophysics, National Research Council, PO Box 248, Penicton, BC, Canada V2A 6K3 |
| Abstract: | We present subarcsecond MERLIN 0.4-GHz (73 cm) and 1.6-GHz (18 cm) radio measurements of the nuclear region of the Seyfert galaxy NGC 4151. By comparison with higher frequency observations, we deduce that one component (C4) shows a low-frequency turnover which we interpret as evidence for free–free absorption by ionized gas with an emission measure between 3 × 10 |
| Keywords: | galaxies: individual: NGC 4151 galaxies: nuclei galaxies: Seyfert radio continuum: galaxies |