Other
Scientific paper
Aug 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983aj.....88.1094k&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 88, Aug. 1983, p. 1094-1107.
Other
366
Astronomical Spectroscopy, Emission Spectra, H Alpha Line, Spiral Galaxies, Stellar Evolution, Virgo Galactic Cluster, B Stars, Cosmic Dust, H Ii Regions, Hubble Constant, Instrument Errors, Nitrogen, Nuclear Reactions, O Stars, Star Formation Rate
Scientific paper
The combined results of photometric and spectrophotometric surveys of H-alpha emission in 200 field and Virgo cluster galaxies are presented. In most spiral galaxies the emission is dominated by normal disk H II regions, and consequently the integrated Balmer flux of a galaxy can be used as a quantitative index of its current OB star formation rate. Uncertainties due to instrumental effects, nuclear emission, forbidden-line N II emission, and extinction by dust, are evaluated. The integrated emission of a galaxy is strongly correlated with its Hubble type and color, confirming the earlier conclusions of Cohen (1976). Emission among galaxies of a given type varies greatly, however, and in most cases is due to a real dispersion in star formation activity. This activity is only weakly correlated with galaxy luminosity or H I content, suggesting that some other parameter is more important.
Kennicutt Robert C. Jr.
Kent Stephan M.
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