Astronomy and Astrophysics – Astrophysics
Scientific paper
Jan 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984afz....20...73k&link_type=abstract
(Astrofizika, vol. 20, Jan.-Feb. 1984, p. 73-83) Astrophysics (ISSN 0571-7132), vol. 20, no. 1, July 1984, p. 50-56. Translation
Astronomy and Astrophysics
Astrophysics
4
Galactic Clusters, Galactic Evolution, Nuclear Fusion, Quasars, Disk Galaxies, Optical Properties, Stellar Composition
Scientific paper
The possible existence of two QSO populations with different properties is considered. The problem is discussed with reference to observational data for the occurrence of QSOs in groups and to a theoretical estimate of the possibility of fusion of member QSOs into a central giant cD galaxy. The fainter (population I) QSOs are identified with the nuclei of the primary galaxies in distant clusters, while brighter (population II) QSOs are identified with the nuclei of secondary (merged) cD galaxies in the centers of groups and poor clusters. Within these criteria, the distribution of population I QSOs must reflect the corresponding distribution of young galaxies which can be detected at magnitudes of 22 mag of more. It is shown that the known QSOs with magnitudes of less than 22 mag are mainly population II QSOs. It is found that the limits of background radiation for certain values of the spectral index and the slope of the optical dependence N(m) for both groups do not rule out the existence of numerous and faint population I QSOs. Some possible explanations are offered for the lack of population II QSOs in the regions occupied by rich clusters.
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