Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apj...388..310k&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 388, April 1, 1992, p. 310-327.
Astronomy and Astrophysics
Astrophysics
508
Astronomical Spectroscopy, Emission Spectra, H Alpha Line, Line Spectra, Peculiar Galaxies, Active Galactic Nuclei, Irregular Galaxies, Spiral Galaxies, Star Formation Rate, Starburst Galaxies
Scientific paper
Results from a survey of the integrated spectra of 90 nearby galaxies are presented. Intermediate- and low-resolution spectrophotometry over the 3650-7000-A range is used to compile a spectral atlas of galaxies and to investigate the systematic behavior of the emission-line spectra in normal and peculiar galaxies. The integrated absorption- and emission-line spectra show a smooth progression with Hubble type. Most spiral and irregular galaxies exhibited detectable emission lines of H-alpha forbidden O II, N II, S II, and sometimes H-beta and forbidden O III. Methods for distinguishing between distant starburst galaxies and active nuclei are discussed. The new data are used to examine the statistical properties of the forbidden O II emission in galaxies and to calibrate a mean relation between O II luminosity and the total star formation rate. The forbidden O II distribution for faint galaxies is very similar to that which is observed for nearby Markarian galaxies.
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