SIMBAD references

Coordinated observations of the galactic center region using the imaging SIGMA instrument and the high-sensitivity OSSE instrument were performed to separate the compact source contributions from the diffuse component. The resulting compact-source corrected spectrum of the galactic center region is found to be similar in both intensity and spectral index to the spectra obtained from OSSE observations of the galactic plane at l=25° and 339°, suggesting that the spatial distribution of the emission is broad and nearly flat in galactic longitude. At energies below ∼100keV, the observed spectrum is found to be softer and more intense than predicted by theoretical models. The observed low energy continuum may be either diffuse in origin, or due to multiple unresolved X-ray sources below the SIGMA detection threshold.