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The ionizing radiation field of NGC 4388 and its relation to the extranuclear emission-line regions

New long-slit spectroscopic observations of NGC 4388 and the extranuclear emission line regions around it are used to investigate the characteristics of the ionizing source and the structure of the extended emission-line regions. The measured luminosity of the [Fe VII] λ6087 emission line detected in the nucleus of NGC 4388 is interpreted as evidence for the existence of a powerful ionizing source with N ph (≥100 eV)≥2×10 50 photons s −1 and for the presence of clouds of gas with electron densities N e ≃10 7 cm −3