Physics
Scientific paper
Oct 1968
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1968pthph..40..781s&link_type=abstract
Progress of Theoretical Physics, Vol. 40, No. 4, pp. 781-795
Physics
9
Scientific paper
Considering the absorption of extragalactic radiation in an expanding medium, we investigated observable limits of distances, i.e. observable horizons. For each of various radiations, the universe was cloudy in the early stage filled with a dense absorbing medium, and it was thereafter cleared up at some critical time tc. Photons emitted at tc suffer the reddening, being expressed in terms of red-shift parameter z; z+1=101.6im; 103.1 for γ-rays, 100.9˜ 102.3 for X-rays and 100.9 ˜ 103 for thermal photons corresponding to the Friedmann universe model with the present matter density ρm0=10-29˜ 10-32 g/cm3. As the cosmic black-body radiation is a relict radiation emitted from matter at the observable horizon, it may carry the information on the strucure in the early period of 105˜ 107 years since the birth of the universe. From this point, an inhomogeneous distribution of this radiation with the angular size of 10'˜ 1'' is likely to take place conserning the galaxy formation.
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