Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apj...386...59c&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 386, Feb. 10, 1992, p. 59-67. Research supported by CAICYT.
Astronomy and Astrophysics
Astronomy
20
Active Galactic Nuclei, Emission Spectra, Ionizing Radiation, Seyfert Galaxies, Ultraviolet Astronomy, Astronomical Spectroscopy, Cosmic Dust, Iue, Star Clusters, Ultraviolet Emission
Scientific paper
The characteristics of the ionizing source and the structure of the extended emission-line regions of NGC 4388 are investigated from new long-slit spectroscopic observations of the galaxy and the extranuclear emission line regions around it. The measured luminosity of the forbidden Fe VII 6087 emission line detected in the nucleus of NGC 4388 is interpreted as evidence for the existence of a powerful ionizing source. A comparison between the FIR luminosity and the UV-extrapolated ionizing luminosity as measured along the present line of sight suggests that NGC 4388 has a hidden UV luminous source in its nucleus which is about six times brighter than observed. The excitation conditions in the extranuclear emission-line regions are best accounted for by the ionization from a nonthermal central source in the nucleus of NGC 4388.
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