Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978ap%26ss..59...73c&link_type=abstract
Astrophysics and Space Science, vol. 59, no. 1, Nov. 1978, p. 73-83.
Astronomy and Astrophysics
Astronomy
34
Bremsstrahlung, Electron Flux Density, Gamma Ray Astronomy, Interstellar Matter, Cos-B Satellite, Energy Spectra, Galactic Radiation, Sas-2
Scientific paper
The paper presents a detailed study of the bremsstrahlung gamma-ray emissivity of the galactic disk. It is shown that there are large uncertainties in the production spectrum of photons in the medium energy range (10-100 MeV) due to lack of knowledge of the interstellar electron spectrum below a few hundred MeV. In fact, gamma-ray observations can be of great help in determining this spectrum. At present, the spectral shape of the local gamma-ray emissivity above 30 MeV is available, thanks to the SAS-II and the COS-B satellites. Calculated and observed spectral shapes are compared, and the local interstellar electron flux in the 50-500 MeV range is determined; the corresponding integrated gamma-ray emissivity above 100 MeV is equal to 2.4 times 10 to the -25th photons/sec per H-atom, 60 percent higher than previously accepted values.
Cesarsky Catherine J.
Paul J. A.
Shukla P. G.
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