Emission-line widths in galactic nuclei

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Emission Spectra, Galactic Nuclei, H Beta Line, Oxygen Ions, Seyfert Galaxies, Spectral Line Width, Astronomical Spectroscopy, Forbidden Bands, Galactic Structure, Hot Stars, Spectral Resolution

Scientific paper

Line width measures for the forbidden O III emission lines have been obtained for 116 galactic nuclei with instrumental resolution of 165 km/sec. Galaxies observed include 53 Seyfert 1 galaxies, 16 Seyfert 2 galaxies, and 47 star-burst galaxies for which the nuclear emission lines are attributed to ionization by hot, short-lived stars. The median FWHM for the forbidden O III lines is 375 km/sec for Seyfert 1, 510 km/sec for Seyfert 2, and 160 km/sec for star-burst nuclei. It is suggested that an empirical criterion for dividing Seyfert galaxies from other emission line galaxies is a FWHM greater than 250 km/sec for the forbidden O III lines. From dynamical arguments, the star-burst nuclei are determined to have the star formation activity restricted to a nuclear disk with radius less than a few hundred parsecs.

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