Searching for Dark Matter with Xray Observations of Local Dwarf Galaxies.pdf

Searching for Dark Matter with X-ray Observations of Local Dwarf Galaxies T. E. Jeltema Morrison Fellow, UCO/Lick Observatories, 1156 High St., Santa Cruz, CA 95064, USA 8 0 tesla@ 0 2 S. Profumo n u J Department of Physics and Santa Cruz Institute for Particle Physics 0 University of California, 1156 High St., Santa Cruz, CA 95064, USA 3 ] profumo@ h p - o ABSTRACT r t s a [ A generic feature of weakly interacting massive particle (WIMP) dark mat- 2 ter models is the emission of photons over a broad energy band resulting from v the stable yields of dark matter pair annihilation. Inverse Compton scattering 4 5 off cosmic microwave background photons of energetic electrons and positrons 0 produced in dark matter annihilation is expected to produce significant diffuse 1 5. X-ray emission. Dwarf galaxies are ideal targets for this type of dark matter 0 search technique, being nearby, dark matter dominated systems free of any astro- 8 0 physical diffuse X-ray background. In this paper, we present the first systematic : v study of X-ray observations of local dwarf galaxies aimed at the search for WIMP i X dark matter. We outline the optimal energy and angular ranges for current tele- r scopes, and analyze the systematic uncertainties connected to electron/positron a diffusion. We do not observe any significant X-ray excess, and translate