The High Energy Gamma-Ray Background as a Probe of the Dark Matter in the Galactic Halo

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We present constraints on the density of halo dark matter candidates within the solar circle based on the anisotropy in the high energy gamma-ray background. The known galactic components of the gamma-ray background, in particular the inverse Compton component, have been estimated more accurately. We find the spectrum of the residual emission, after subtracting the galactic component is inconsistent with emission from some of the proposed dark matter candidates. We derive upper limits of 10⁸ Mₛun for the mass of diffuse gas and 3*10⁹ pc(-3) for the number density of primordial black holes contributing to the gamma-ray background.