The isotropy of the X-ray background in the energy range 2-18 keV

Astronomy and Astrophysics – Astronomy

Scientific paper

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Background Radiation, Cosmic X Rays, Isotropy, Spaceborne Astronomy, X Ray Astronomy, Compton Effect, Galactic Radiation, High Temperature Gases, Radiation Distribution, Stellar Radiation, X Ray Sources

Scientific paper

A study of the large-scale isotropy of the X-ray background in the energy range 2-18 keV has revealed significant variations in the intensity distribution over the sky (absolute value of b greater than 20 deg). A galactic component is apparent which contributes between 2.5 and 7.2 per cent of the background between galactic latitudes 90 and 20 deg, respectively. It is found that the most plausible interpretation of this feature is in terms of inverse Compton scattering of starlight and the microwave background by low-energy cosmic ray electrons. The residual background variations in terms of both 24- and 12-hr effects is investigated.

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