The intensities of the sulphur III lines and the ionization mechanisms in Liners

Details The intensities of the sulphur III lines and the ionization mechanisms in Liners The intensities of the sulphur III lines and the ionization mechanisms in Liners

Feb 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985mnras.212..737d&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 212, Feb. 1, 1985, p. 737-749.

Astronomy and Astrophysics

Astronomy

43

Astronomical Spectroscopy, Emission Spectra, Galactic Nuclei, Hydrogen Clouds, Photoionization, Sulfur, Line Spectra, Oxygen Spectra, Seyfert Galaxies, Spectrophotometry, Spiral Galaxies

Scientific paper

New near-infrared spectrophotometric observations show that the relative strengths of the sulfur forbidden emission lines S III 9069, 9532 A with respect to H-alpha constitute a powerful diagnostic to distinguish between shock and photoionization mechanisms in Liners (Low Ionization Emission-line Regions). These observations strongly support the idea, already favored on the basis of abundance arguments, that Liners and Seyferts form a continuous sequence, both types of objects being photoionized, but with the ionization parameter being lower in Liners. This photoionization could be due either to the presence of a central nonthermal source or to recent star formation.

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