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Recent cosmic ray, gamma ray, and microwave signals observed by Fermi,PAMELA, and WMAP indicate an unexpected primary source of e+e- at 10-1000 GeV.We fit these data to "standard backgrounds" plus a new source, assumed to be aseparable function of position and energy. For the spatial part, we considerthree cases: annihilating dark matter, decaying dark matter, and pulsars. Ineach case, we use GALPROP to inject energy in log-spaced energy bins andcompute the expected cosmic-ray and photon signals for each bin. We then fit alinear combination of energy bins, plus backgrounds, to the data. We use anon-parametric fit, with no prior constraints on the spectrum except smoothnessand non-negativity. In addition, we consider arbitrary modifications to theenergy spectrum of the "ordinary" primary source function, fixing its spatialpart, finding this alone to be inadequate to explain the PAMELA or WMAPsignals. We explore variations in the fits due to choice of magnetic field,primary electron injection index, spatial profiles, propagation parameters, andfit regularization method. Dark matter annihilation fits well, where our fitfinds a mass of ~1 TeV and a boost factor times energy fraction of ~70. Whileit is possible for dark matter decay and pulsars to fit the data,unconventionally high magnetic fields and radiation densities are required nearthe Galactic Center to counter the relative shallowness of the assumed spatialprofiles. We also fit to linear combinations of these three scenarios, thoughthe fit is much less constrained.

The Electron Injection Spectrum Determined by Anomalous Excesses in Cosmic Ray, Gamma Ray, and Microwave Signals