Titlebook: Cosmic Radiation in Contemporary Astrophysics; Maurice M. Shapiro Book 1986 D. Reidel Publishing Company, Dordrecht, Holland 1986 Populati

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Malleable

X-Ray Sky Surveys and the Rosat Missionnts and transients. The extragalactic sources are mainly clusters of galaxies as well as Seyfert galaxies and BL Lac Objects. The identifications and follow-up studies of these sources have produced the main advances in X-ray astronomy in the first half of the 1970’s.

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Analogy

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Ultra High Energy Gamma-Ray Astronomyon of ultra high energy γ-rays in the sources are discussed..It is demonstrated that if the γ-rays are produced via cosmic ray interactions the sources have to produce very high fluxes of cosmic ray particles. In fact it is possible that a small number of such sources can supply the whole Galactic cosmic ray flux.

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