Abstract
Translated from Astrofizika; 7: No. 3, 359-406(1971). Spectroscopic observations of a sample of galactic nuclei from the lists of Markaryan and Seyfert are presented in order to consider the nature of nuclei with broad emission lines. It is found from photographic spectrophotometry and emission line profiles that such galaxies can be consistently classified into two classes: objects like NGC 5548 that are found to have small, dense nuclei containing low velocity gas and objects like NGC 1068 with larger nuclei containing gas of lower density but higher velocity. The observational data favors broadening by electron scattering for the Balmer lines in the first class, and the absolute luminosity in H BETA is generally greater in the first class than in the second. From the extreme spectroscopic and morphological similarity of all galaxies in the second class, it is concluded that the outflow of gas from the nucleus has affected the structure of the entire galaxy. (auth)
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