Ultraviolet Diagnostics for the Emission‐Line Gas in Active Galaxies
Ultraviolet Diagnostics for the Emission‐Line Gas in Active Galaxies
Optical diagnostic diagrams are frequently ambiguous as tests of the photoionization or fast-shock models of the narrow-line regions of active galaxies. Here, we present a set of UV line ratio diagrams that can discriminate between pure shock and photoionization modes of excitation and can, to some extent, also discriminate shocks …