A survey of northern Seyfert galaxies

Details A survey of northern Seyfert galaxies A survey of northern Seyfert galaxies

Jan 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988pasp..100...54w&link_type=abstract

Astronomical Society of the Pacific, Publications (ISSN 0004-6280), vol. 100, Jan. 1988, p. 54-62.

Mathematics

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7

Astronomical Spectroscopy, Ionization Potentials, Northern Sky, Seyfert Galaxies, Spectral Energy Distribution, Spectral Line Width, Emission Spectra, Hydrogen Clouds, Red Shift, Spectral Correlation

Scientific paper

A medium-resolution spectroscopic study of a complete sample of bright northern Seyfert galaxies was conducted. A correlation of the linewidths with the critical density and the ionization potential is found for NGC 1358 and NGC 3660. After correcting for the instrumental profile and the contributions of H II regions, several linewidths are shown to not exceed 250 km/sec. The line ratios are typical for Seyfert 2 objects for all the galaxies considered. Results suggest that locally Seyfert 2 galaxies are about 3.5 times more abundant than Seyfert 1 objects, and that they suffer from a more rapid drop-off in detection probability than Seyfert 1s.

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