Physics
Scientific paper
Nov 1969
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1969pthph..42.1129f&link_type=abstract
Progress of Theoretical Physics, Vol. 42, No. 5, pp. 1129-1138
Physics
2
Scientific paper
It has veen pointed out that the diffuse component of cosmic X-rays could be accounted for in terms of the inverse Compton collisions of relativistic electrons with universal black-body photons. This hypothesis is examined in the present paper, taking into account evolutionary effects that result in decreases of the energy density of the universal black-body radiation and of the production rate of relativistic electrons with cosmic age. The results obtained are: (1) the spectrum of X-rays bends at about 0.3 KeV according to the energy loss of electrons due to the inverse Compton effect and (2) the magnetic field strength in radio galaxies should be as low as 10-7-10-8 gauss if the electrons had an intensity high enough to explain the X-ray intensity and the same electrons were responsible for radio emission. The bending energy given in (1) is much lower than the observed one; thus the inverse Compton effect cannot explain the bending of the X-ray spectrum. The second conclusion (2) is much severer than that obtained by Bergamini et al.; the magnetic field strength required seems to be unreasonably low. Our results are thus unfavourable to the inverse Compton effect hypothesis.
Fukui Masatoshi
Hayakawa Saito
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