Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979esoa.rept....1k&link_type=abstract
"Evolutional schemes for objects with active nuclei Transl. into ENGLISH of "Evolyutsionnyye Skhemy Obyektov s Aktivnymi Yadrami
Astronomy and Astrophysics
Astronomy
Galactic Evolution, Galactic Nuclei, Intergalactic Media, Quasars, Balmer Series, Galactic Clusters, Galactic Radio Waves, Radiation Spectra, Radio Astronomy
Scientific paper
The observational properties of quasistellar objects (QSO) reveal that they are extremely violent nuclei of distant galaxies, but the evolutionary stage of these galaxies is still undetermined. Various published attempts to classify QSO under different criteria - including the one based on the morphological type of the surrounding galaxy E- or S- are analyzed. There are evidences that radioactive quasars reside in E-, while radio-quiet quasars reside in both E- and S- systems. The latter may be evolutionary connected to Seyfert-like objects. A correlation between the nuclei activity level in systems of different morphological type and the relative amount of gas in them is noted. From the point of view of activity level and the duration of active stage of nuclei it is concluded that an interaction of galaxies with the intergalactic medium is of particular importance and must be most conspicuous in spheriodal systems of central regions of rich clusters, in tight groups and binary galaxies.
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