MeV Gamma-Ray Source Contribution to the Inner Galactic Diffuse Emission

Abstract

The origin of the inner Galactic emission, measured by COMPTEL with a flux of $\sim 10^{-2}{\mathrm{MeV}\mathrm{cm}}^{-2}{\mathrm{s}}^{-1}{\mathrm{sr}}^{-1}$ in the 1-30 MeV energy range from the inner Galactic region, has remained unsettled since its discovery. In this paper, we elaborate on a model of individual MeV gamma-ray sources unresolved by COMPTEL. This is conducted for sources crossmatched between the Swift-BAT and Fermi-LAT catalogs by interpolating the energy spectra in the hard X-ray and GeV gamma-ray ranges, as well as unmatched sources between the two catalogs. We find that the source contribution to the COMPTEL emission would be at least ~20%. Combined with the Galactic diffuse emission, which is not well constrained, the COMPTEL emission can be roughly reproduced in some cases.

14 pages, 9 figures, and 2 tables. Accepted for publication in ApJ

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Cited by in corpus (4)

• Probing the Galactic Diffuse Continuum Emission with COSI
• COCOA: a compact Compton camera for astrophysical observation of MeV-scale gamma rays
• Enhancing Compton telescope imaging with maximum a posteriori estimation: a modified Richardson-Lucy algorithm for the Compton Spectrometer and Imager
• Diffuse continuum emission and large extended sources at MeV energies