On the distribution of the diffuse Galactic gamma-ray line emissions at 1809 keV and 511 keV

Details On the distribution of the diffuse Galactic gamma-ray line emissions at 1809 keV and 511 keV On the distribution of the diffuse Galactic gamma-ray line emissions at 1809 keV and 511 keV

Oct 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apj...380...98v&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 380, Oct. 10, 1991, p. 98-103. Research supported by Eidgenoessische Techni

Astronomy and Astrophysics

Astrophysics

12

Diffuse Radiation, Emission Spectra, Galactic Radiation, Gamma Ray Spectra, Line Spectra, Radiation Distribution, Annihilation Reactions, Nuclear Fusion, Shock Waves

Scientific paper

A distribution for the Galactic gamma-ray line emissions at 1809 and 511 keV is proposed. It is suggested that both the diffuse Al-26 and the e(+)e(-) emission are reflected by the distribution of thin hot plasma as derived from X-ray observations of the Galactic ridge. The model consists of a flat Galactic distribution with enhanced features at l = + or - 25 deg and a dominant narrow peak at the Galactic center containing a third of the total emission in the central radian. This hypothesis is substantiated by theoretical and observational considerations. The proposed distribution is consistent with the present measurements of the gamma-ray line at 1809 keV and almost all the observations at 511 keV. Evidence for a connection between the thin hot plasma and gamma-ray line emission is presented. Injection of kinetic energy into the interstellar medium is inherent in the sites of Al-26 nucleosynthesis.

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