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Pedlar, A.,Fernandez, B.,Hamilton, N. G.,Redman, M. P.,Dewdney, P. E.
1998
Unknown
Monthly Notices Of The Royal Astronomical Society
Free-free absorption in the Seyfert nucleus of NGC 4151
Published
()
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300
1071
1076
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 3x10^5 and 10^6 pc cm^-6. The free-free absorption appears to be localized to a region ~50 pc in extent, and we consider models in which the ionized gas may be closely associated with a neutral molecular torus.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 3x10^5 and 10^6 pc cm^-6. The free-free absorption appears to be localized to a region ~50 pc in extent, and we consider models in which the ionized gas may be closely associated with a neutral molecular torus.
0035-87110035-8711
http://adsabs.harvard.edu/abs/1998MNRAS.300.1071Phttp://adsabs.harvard.edu/abs/1998MNRAS.300.1071P
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