Time-averaged COMPTEL energy spectrum of GRO J1823-12 for the sum of all data (see Fig. 3) compared to the extrapolations of the Fermi/LAT spectrum of the six closest γ-ray sources and to the extrapolation of the time-averaged X-ray spectrum (1−10 keV, dashed blue line) of LS 5039 as measured by Suzaku (Takahashi et al. 2009). The thick solid lines represent the spectral shape derived from best-fit Fermi/LAT integral fluxes between 100 and 300 MeV by assuming a power-law shape of fixed index. This index was derived by a power law throughout the Fermi/LAT energy band. The thin solid lines represent the spectral extrapolations down to 1 MeV. For the known Fermi/LAT sources, the spectral extrapolation for LS 5039 comes closest to the COMPTEL 10−30 MeV measurement. Also the power-law extrapolation of the Suzaku-measured X-ray spectrum is in reasonable agreement with the COMPTEL spectrum of GRO J1823-12. For more details see text.
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