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A gamma-ray excess from the galactic center consistent with line emissionaround 130 GeV was recently found in the Fermi-LAT data. Although the Fermi-LATCollaboration has not confirmed its significance, such a signal would be aclear signature of Dark Matter annihilation. Until now, there have been manyattempts to explain the excess by Dark Matter. However these efforts tend togive too-small cross sections into photons if consistency with the correctthermal relic density of Dark Matter is required. In this letter, we consider asimple Yukawa interaction that can be compatible with both aspects and showwhich parameters are favored.

Internal Bremsstrahlung Signature of Real Scalar Dark Matter and Consistency with Thermal Relic Density