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2–20 keV X-ray sky background

Published online by Cambridge University Press:  14 August 2015

E. A. Boldt ,
U. D. Desai ,
S. S. Holt  and
P. J. Serlemitsos
E. A. Boldt
Affiliation:
NASA/Goddard Space Flight Center, Greenbelt, Md., U.S.A.
U. D. Desai
Affiliation:
NASA/Goddard Space Flight Center, Greenbelt, Md., U.S.A.
S. S. Holt
Affiliation:
NASA/Goddard Space Flight Center, Greenbelt, Md., U.S.A.
P. J. Serlemitsos
Affiliation:
NASA/Goddard Space Flight Center, Greenbelt, Md., U.S.A.

Abstract

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The diffuse background of 2–20 keV X-rays over a band of the sky extending from Scorpius to the North galactic pole is found to be isotropic to within 5%, with a spectrum given by where n = (1.35 ±0.100.07).

A comparison with spectra at higher energies indicates that the lower energy spectrum is flatter, corresponding to an apparent unit change in spectral index within the band 20–80 keV. A spectral break in this energy region has been discussed in connection with the collisional energy loss lifetime for metagalactic protons that radiate X-rays via inverse bremsstrahlung collisions with the ambient electrons of the intergalactic medium (Boldt and Serlemitsos, 1969; Hayakawa, 1970).

Type
Research Article
Information
Symposium - International Astronomical Union , Volume 37: Non-Solar X- and Gamma-Ray Astronomy , 1970 , pp. 309 - 314
Copyright
Copyright © Reidel 1970 

References

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