The extended narrow line region in Mkn79. I.Observations
Nazarova, L. S. · O'Brien, P. T. · Ward, M. J.
Original · EN
We present deep long slit spectra of Mkn79 in position angles PA=12ᵒ and PA=50ᵒ obtained with the WHT. These data prove the existence of an extended narrow line region in PA=12ᵒ, which coincides with the triplet radio structure (Ulvestad & Wilson 1984) and the observed outflow of material from the nucleus at PA=10ᵒ (Whittle et al. 1988). The ratios of the high to low ionization lines indicate a higher level of gas excitation in PA=12ᵒ compared to PA=50ᵒ. The [NII]λ6583/Hα and [SII]λ6717,31/Hα versus [OIII]λ5007/Hβ line ratios are consistent with excitation by an AGN continuum rather than a HII region.
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