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Astron. Astrophys. 321, 397-408 (1997)

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The extended narrow line region in Mkn 79

II. Modelling

L.S. Nazarova , P.T. O'Brien and M.J. Ward

Department of Physics & Astronomy, University of Leicester, University Road, LE1 7RH, Leicester, UK

Received 2 July 1996 / Accepted 22 October 1996


We present photoionization modelling of the Extended Narrow Line Region (ENLR) in Mkn 79 based on long-slit spectra presented in our previous paper (Nazarova et al. 1996). The ENLR has been modelled with two gas components: a system of high density clouds embedded in a low density gas envelope. The ENLR line fluxes have been calculated allowing for attenuation of the nuclear ionizing continuum as a function of distance from the centre. The diffuse continuum emission from the low density gas is also included as an important secondary source of ionization. We show that this multi-component gas model can successfully reproduce the observed line fluxes and line ratios in the ENLR of Mkn 79 assuming a central source luminosity of 6.6 [FORMULA] 1052 photons s-1, consistent with the dereddened nuclear luminosity. The predicted reflected continuum from the ENLR gas is also in agreement with the observed extended blue continuum emission.

Key words: galaxies: active – galaxies: individual: Mkn 79 – galaxies: Seyfert

Send offprint requests to: P.T. O'Brien

© European Southern Observatory (ESO) 1997

Online publication: June 30, 1998