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Cosmic background X-rays produced by intergalactic innerbremsstrahlung

Published online by Cambridge University Press:  14 August 2015

Satio Hayakawa
Satio Hayakawa*
Affiliation:
Dept. of Physics, Nagoya University, Nagoya, Japan

Extract

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It has been found difficult to explain both the absolute intensity and energy spectrum of the background component of cosmic X-rays in terms of a superposition of X-ray sources in distant galaxies [1] and of the inverse Compton collisions of metagalactic electrons with microwave photons [2]. Although the absolute intensity could be obtained by choosing suitable values of parameters which are not well known as yet, the gradual bending of the X-ray spectrum around 30 keV provides a critical test of theories. In this respect innerbremsstrahlung of intergalactic protons colliding with electrons is a candidate of background X-rays, since the X-ray spectrum is closely related to the proton spectrum and the latter usually bends in the non-relativistic region.

Type
Research Article
Information
Symposium - International Astronomical Union , Volume 37: Non-Solar X- and Gamma-Ray Astronomy , 1970 , pp. 372 - 373
Copyright
Copyright © Reidel 1970 

References

[1] Fujimoto, M., Hayakawa, S., and Kato, T.: 1969, Astrophys. Space Sci. 4, 64.CrossRefGoogle Scholar
[2] Fukui, M. and Hayakawa, S.: 1969, Progr. Theor. Phys. 42, 119.Google Scholar
[3] Ginzburg, V. L. and Ozernoi, L. M.: 1966, Soviet Astron.-AJ 9, 726.Google Scholar
[4] Hayakawa, S.: 1969, Prog. Theor. Phys. 41, 1592.Google Scholar