Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989aj.....97..700g&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 97, March 1989, p. 700-707.
Astronomy and Astrophysics
Astronomy
126
Astronomical Spectroscopy, Emission Spectra, Forbidden Transitions, Galaxies, Oxygen Spectra, Star Formation Rate, Brightness Distribution, Red Shift, Spectral Line Width, Ubv Spectra
Scientific paper
Observations of forbidden O II 3727 A and H-beta emission-line strengths are presented from large-aperture spectrophotometric observations of nearby (z less than 0.1) optically blue galaxies covering a wide range in surface brightness and luminosity. The forbidden O II emission-line equivalent widths in these galaxies primarily lie between 30 and 100 A. Emission-line strengths in nearby blue galaxies thus resemble those found in faint galaxies at moderate-to-high redshifts. The most actively star-forming nearby galaxies are characterized by surface brightness in the forbidden O II line of about 10 to the -15th to 10 to the -14th ergs/s per sq cm per sq arcsec over spatial distances of more than 1 kpc. The fluxes of the forbidden O II and H-beta emission lines are well correlated, and thus forbidden O II luminosities can be used to derive approximate star-formation rates in blue galaxies.
Bushouse Howard
Gallagher Jay S.
Hunter Deidre Ann
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