Galactic Component of the Diffuse X-ray Background

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Scientific paper

WICKRAMASINGHE'S model for the galactic component of the diffuse X-ray background1, which involves scattering of the isotropic component by dust grains, unfortunately contains a fundamental error which completely invalidates it. Particles along a line of sight may indeed scatter isotropic background radiation into the line of sight, but by the same process they will also scatter out of the line of sight the background radiation originally travelling in this direction (ref. 2, for example). If there is no absorption (that is, the albedo is unity) the two scattering effects are equal; this situation now satisfies the first and second laws of thermodynamics and ensures that the galactic disk is quite indistinguishable from the rest of the background. If the albedo is less than one, then the disk should show up in absorption, in contradiction with the observations. In no conditions can the model increase the flux from the disk relative to that of the isotropic background.

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