Free-free absorption in the Seyfert nucleus of NGC 4151

Details Free-free absorption in the Seyfert nucleus of NGC 4151 Free-free absorption in the Seyfert nucleus of NGC 4151

Nov 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998mnras.300.1071p&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Volume 300, Issue 4, pp. 1071-1076.

Astronomy and Astrophysics

Astronomy

16

Galaxies: Individual: Ngc 4151, Galaxies: Nuclei, Galaxies: Seyfert, Radio Continuum: Galaxies

Scientific paper

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.

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