The radio nucleus of NGC 4151 at 5 and 8 GHz

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We present 5- and 8-GHz observations of the Seyfert nucleus of NGC 4151. The observations have angular resolutions ranging from 400 to 50 mas and sensitivities as high as 7 μJy beam −1 . We confirm the picture of a two-sided radio jet along PA 77°, and also detect a weak component 6 arcsec (400 pc) to the east which shows that collimated ejecta associated with the jet extend at least twice as far as revealed by earlier measurements. The central knots in the jet have significantly higher pressure than components in the outer parts. Most of the components in the source have steep spectra, although that of the eastern component in the central double is relatively flat (α = −0.3), consistent with it being associated with the optical continuum nucleus