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We test the plausibility that a Majorana fermion dark matter candidate with ascalar mediator explains the gamma ray excess from the Galactic center.Assuming that the mediator couples to all third generation fermions wecalculate observables for dark matter abundance and scattering on nuclei,gamma, positron, and anti-proton cosmic ray fluxes, radio emission from darkmatter annihilation, and the effect of dark matter annihilations on the CMB.After discarding the controversial radio observation the rest of the dataprefers a dark matter (mediator) mass in the 10-100 (3-1000) GeV region andweakly correlated couplings to bottom quarks and tau leptons with values of10^{-3}-1 at the 68\% credibility level.

Interpreting the Fermi-LAT gamma ray excess in the simplified framework