Part II Radio Galaxies

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Explosive phenomena in galaxies including starlike objects are analyzed from the point of view that they represent an important stage of the evolution of most of galaxies. The number of active galaxies estimated on this view is shown to agree with the observed one. In order to study the evolutionary track of galaxies in and after an explosion, a new diagran, . Called L-L / V diagram, is introduced, which shows the relation between the radio luminosity and the volume emissivity. Two types of evolutional sequences are found: giant sequence including starlike objects, and normal sequence, a typial example of which is found in the Virgo cluster. Supernovae plotted in the sane diagram show a striking aimilarity of their evolution with that of radio galaxies. As to the mechanism of an explosion a new theory, called pile theory, is proposed. Because of the strong static and dynamical interaction between stars and gas in the core of a galaxy, the evolution of a star is accelerated and simultaneous explosion of stars takes place with strong optical emission. The expansion and interaction with a surrounding medium of gas ejected in an explosion is discussed. As to the fomation of the galactic halo, besides the transit formation by an explosion of the core another possibility of the accretion of intergalactic matter onto a galaxy is pointed out and a criterion for these two cases is proposed. Finally extragalactic cosmic rays are discussed assuming a parallelism between radio emission and cosmic ray production in a galaxy, which an be concluded from. the similarity mentioned above. In the Appendix data on 156 radio-emitting galaxies are collected and analyzed.
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Part II Radio Galaxies

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