SIMBAD references

We explore the effects of the scattering of photons incident on a dark matter halo through their interaction with either electrons or photons produced by dark matter annihilation. Particularly, we examine the effects of this scattering upon the observed spectrum of a distant AGN or of the Cosmic Microwave Background. Our results indicate that ultracompact mini haloes and other dense dark matter clumps can induce an observable Comptonization of AGN spectra as well as a Sunyaev-Zel'dovich effect with an optical depth similar to that attained by thermal electrons in the Coma cluster. The rate of occlusion of the line of sight to a distant AGN by these dense mini haloes is also estimated using various limits existing on the population of dark compact bodies.