Physics
Scientific paper
Jan 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001iaus..205...78n&link_type=abstract
Galaxies and their Constituents at the Highest Angular Resolutions, Proceedings of IAU Symposium #205, held 15-18 August 2000 at
Physics
Scientific paper
A photoionization models of high excitation gas in the Extended Narrow Line Region (ENLR) of NGC 1068 are discussed. The ENLR line fluxies have been calculated allowing for attenuation of the central-source ionizing continuum. The observed emission in the ENLR of NGC 1068 from high excitation gas is modelled well by a central luminosity of 3.6×1044erg s-1 between 1014.6 and 1018.4 Hz and an attenuating column density of Nh=1022 cm-2. The observed optical and IR coronal line ratios in NGC 1068 and the Circinus galaxy have been predicted by photoionization model with attenuation of non-thermal (nuclear) continuum source continuum. The attenuation by gas in NGC 1068 is caused with the same column density 1022 cm-2 as obtained in previous modelling of the ENLR. The calculated coronal line ratios are in a good agreement with those observed in NGC 1068 when about 40% of the line emission comes from gas illuminated by unattenuated, non-thermal continuum, and about 60% from gas illuminated by attenuated, non-thermal continuum. In the Circinus galaxy the coronal line emission comes from gas with electron density 103 cm-3 illuminated entirely by attenuated, non-thermal continuum.
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