Physics – Nuclear Physics
Scientific paper
Jun 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981rspta.301..541s&link_type=abstract
(Royal Society, Discussion on Gamma-Ray Astronomy, London, England, Nov. 27, 28, 1980.) Royal Society (London), Philosophical Tr
Physics
Nuclear Physics
24
Diffuse Radiation, Emissivity, Galactic Radiation, Gamma Ray Spectra, Gamma Rays, Interstellar Gas, Cos-B Satellite, Electrons, Gas Density, Hydrogen, Molecular Clouds, Monatomic Gases, Nuclei (Nuclear Physics), Pions, Sas-2
Scientific paper
A survey of recent studies of the correlation between gamma-rays from latitudes where the absolute value of b is greater than 10 deg and gas tracers is presented. Results for the ranges 35-100 MeV and above 100 MeV from the SAS-2 satellite, and for energies between 70 and 5000 MeV from the COS-B satellite, are used to obtain an estimate of the gamma-ray emissivity spectrum for all forms of gas. Good agreement between the two experiments is found. A comparison is made between this spectrum (which is an average for a region some few hundred parsecs around the sun) and that expected for recent estimates of the low energy electron spectrum in the local interstellar medium. If the pion-decay component is as expected for the demodulated interplanetary proton spectrum, then the electron spectrum must have a steep slope (differential index 2.8) below 1 GeV. If the pion contribution is smaller than expected, however, a flatter electron spectrum is allowable. The presence of a component of gamma-ray emission related to gas in molecular form is evident in both the SAS-2 and COS-B data. The correlation of the SAS-2 data with both components is discussed and it is shown that the emissivities of each component can be independently determined. The longitude dependence of the emission is also discussed. Finally, an examination of the gamma-ray fluxes from specific dense clouds of molecular gas is made.
Strong Andrew W.
Wolfendale Arnold W.
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