Forbidden S III emission and extinction in extragalactic H II regions

Details Forbidden S III emission and extinction in extragalactic H II regions Forbidden S III emission and extinction in extragalactic H II regions

Jan 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990aj.....99...61k&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 99, Jan. 1990, p. 61-70.

Astronomy and Astrophysics

Astronomy

15

Emission Spectra, Galactic Nuclei, H Alpha Line, H Ii Regions, Interstellar Extinction, Ultraviolet Astronomy, Balmer Series, Error Analysis, Line Spectra, Star Formation

Scientific paper

The paper critically examines the validity of the forbidden S III 9532/H-alpha emission-line ratio as a quantitative extinction tracer in H II regions, and as a probe of highly obscured H II regions in IR-luminous galaxies. Forbidden S III data from the literature are combined with nebular models to determine the intrinsic error in forbidden S III derived extinctions, and follow-up spectrophotometric observations of the 'hidden' H II regions studied by Young, Kleinmann, and Allen (1988) are obtained. Although the presence of extended S III emission in these galaxies is confirmed, the actual forbidden S III intensities and forbidden S III/H-alpha ratios are 5-20 times lower than reported by these authors.

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