Astronomy and Astrophysics – Astrophysics
Scientific paper
Jul 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981a%26a...100...12v&link_type=abstract
Astronomy and Astrophysics, vol. 100, no. 1, July 1981, p. 12-19.
Astronomy and Astrophysics
Astrophysics
61
Astronomical Spectroscopy, Galactic Nuclei, Seyfert Galaxies, Spectral Line Width, Emission Spectra, Forbidden Bands, H Ii Regions, Nebulae, Oxygen Spectra
Scientific paper
The widths and profiles of emission lines from the nuclei of Seyfert galaxies and nuclear H II regions are investigated. Spectra were obtained with a resolution of 100 km/sec for nine Seyfert 1, and eight Seyfert 2 galaxies and eight nuclear H II regions in the range 4600-5100 A. From examination of the O III forbidden line at 5007 A of the nuclear regions, it is found that nuclear H II regions usually have narrow emission lines which can be fit, to a first approximation, by a gaussian profile with FWHM not exceeding 150 km/sec. The forbidden lines of the Seyfert galaxy, on the other hand, are generally observed to have asymmetric profiles, usually with broad red and blue wings and a probable excess of blue wings. In most cases, a Seyfert nucleus can be distinguished from an H II region on the basis of the N2 line profile. It is also observed that at a given resolution, the observed profile depends on aperture parameters, due to the presence of distinct clouds in the Seyfert 2 nucleus.
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