Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991aipc..232..149v&link_type=abstract
IN: Gamma-ray line astrophysics; Proceedings of the International Symposium, Paris, France, Dec. 10-13, 1990 (A92-43619 18-90).
Astronomy and Astrophysics
Astrophysics
16
Aluminum 26, Emission Spectra, Gamma Ray Astronomy, Line Spectra, Positron Annihilation, Cosmic Plasma, Galactic Structure, Milky Way Galaxy, Nuclear Astrophysics, Supernovae, Wolf-Rayet Stars
Scientific paper
Galactic emissions from gamma rays at 1809 keV and 511 keV are studied by means of observational evidence to suggest a distribution for the Al-26 and electron-positron components. A flat galactic distribution is proposed in which a dominant narrow peak at the Galactic center provides a third of the total emission from the central radian. The Al-26 detections and 511-keV observations support this distribution, and a connection between the thin hot plasma and the gamma-ray line emission is proposed. Explosive escape of the Al-26 from the hot regions of fast production and decay is thought to originate in Wolf-Rayet stars and supernovae. The shock front is transformed into thermal energy and high gas temperatures, and evidence from X-ray telescopes confirm the hot plasma. The hot plasma can suggest the sites of recent nucleosynthesis where the 511-keV radiation originates.
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