Diffuse X-ray spectrum from 10 to 40 keV measured with rocket-borne scintillation counters

Details Diffuse X-ray spectrum from 10 to 40 keV measured with rocket-borne scintillation counters Diffuse X-ray spectrum from 10 to 40 keV measured with rocket-borne scintillation counters

Jul 1975

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975ap%26ss..35..255i&link_type=abstract

Astrophysics and Space Science, vol. 35, July 1975, p. 255-268.

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Diffuse Radiation, Energy Spectra, Rocket Sounding, X Ray Spectra, Atmospheric Models, Bremsstrahlung, Energy Dissipation, Rocket-Borne Instruments, Scintillation Counters, Spectral Energy Distribution

Scientific paper

The energy spectrum of the diffuse component of cosmic X-rays was measured with rocket-borne scintillation counters. Subtracting the environmental background unambiguously by means of the shutter method, the absolute values of the cosmic X-ray flux are obtained in a few keY band from 10 to 40 keY. The result indicates that the energy spectrum sharply changes its slope around 20-30 keV. Some trial functions for the spectrum are compared with our result; among them a thermal bremsstrahlung spectrum and a two-slope power law spectrum seem to fit very well. The former needs, however, another origin of X-rays in the lower and higher energy regions. `Sharpness' of the break in the case of the latter is discussed, including a data point in high energy side from a balloon experiment. The acceptable range of the spectral index in the high energy side is 2.3-2.6, that of the break energy is 20-30 keY and the corresponding transition width is smaller than 50 keY, if the confidence level is to be better than 5%. Non-thermal X-ray generation due to the inverse Compton effect does not reproduce the X-ray spectrum, even if the electron spectrum shows a sharp break. Bremsstrahlung with the non-thermal electrons or protons with a sharp cut in the low energy side of the spectrum can reproduce our result, though such a cut seems unrealistic. Our result may suggest that current theories on the origin of the diffuse X-rays have to be revised

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