Mathematics – Logic
Scientific paper
Dec 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977acasn..18..227l&link_type=abstract
Acta Astronomica Sinica, vol. 18, Dec. 1977, p. 227-238. In Chinese, with abstract in English.
Mathematics
Logic
Galactic Evolution, Galactic Nuclei, Seyfert Galaxies, Statistical Analysis, Balmer Series, Galactic Structure, H Alpha Line, Spiral Galaxies, Stellar Mass Ejection
Scientific paper
By classifying the 70 Seyfert galaxies (SyG) by the existence and/or the nonexistence of the jet and spiral, it is discovered that the jet and spiral are incompatible in the morphological scheme of the SyG's. The jet is the main characteristic property of most of the 2nd class SyG while the spiral is that of the 1st class. The 1st class SyG may be further divided into three subclasses: nonactive, moderately active, and active. The 2nd class SyG may be subdivided into two subclasses: nonactive and active. The calculated geometrical structure and the physical parameter of the emission-live-envelope of each subclass agree with these observed values. It is suggested that the sequence proposed reflects the material expansion of the violent activity of the galactic nucleus. Therefore, in the evolutionary history of some 1st class SyG's, there might be a series of large-scale explosions which disrupted or even destroyed their spiral arms and then settled down to become the 2nd class SyG's with jets as the remnants of these ejection processes.
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