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Previously, [1207.0458] proposed an astrophysical explanation of narrowgamma-ray line-like feature(s) at ~100 GeV from Galactic Center region observedby Fermi/LAT [1205.4700]. The model of [1207.0458] is based on the inverseCompton scattering of external ultra-violet/X-ray radiation by a coldultra-relativistic electron-positron pulsar wind. We show that the extra broad~30 MeV component should arise from Comptonization of cosmic microwavebackground radiation. We estimate the main parameters of this component andshow that it can be detectable with MeV telescopes such as CGRO/COMPTEL. Thelocation of CGRO/COMPTEL unidentified source GRO J1823-12 close to excess of105-120 GeV emission (Reg.1 of [1205.4700]) can be interpreted as an argumentin favour of astrophysical model of the narrow feature(s) at ~100 GeV.

Comptonization of cosmic microwave background by cold ultra-relativistic electron-positron pulsar wind and origin of ~100 GeV lines