Cones of Ionizing Radiation in Active Galaxies - Probing the Central Engine
Highly ionized gas has been detected at large distances from the nucleus in several classes of active galaxies. There is evidence that photoionization by the active nucleus may be the most relevant mechanism for the observed ionization. The spatial distribution of such gas has a conical shape, whose vertex points towards the nucleus and the axis is
Acosta-Pulido, J. et al.
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1990