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Origin of a Diffuse Galactic Emission at 511 KEV

Published online by Cambridge University Press:  12 April 2016

M. Signore  and
G. Vedrenne
M. Signore
Affiliation:
E.N.S. 24, rue Lhomond, 75231 PARIS CEDEX, France
G. Vedrenne
Affiliation:
E.N.S. 24, rue Lhomond, 75231 PARIS CEDEX, France

Extract

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Recent results of SMM on the galactic 511 keV annihilation radiation exhibit a constant flux during 4–5 years, in total disagreement with post 1980 balloon observations. However, all these results are compatible if one admits the existence of a variable point source near the Galactic Center of FP ∼ 10−3 ph cm−1 s−1 and a diffuse interstellar source of positrons: FD ∼ 1.5−1.8 10 ph cm−2 s−1 rad−1. Evaluations of 26Al and 56Co decays contributions have been given last year (2) and that of 44Ti decays more recently (3). We have studied the nature of the sources of the main e+ − emitting radioisotopes − SN and novae − and their galactic distributions using the observational data at 511 keV and at 1809 keV, the galactic angular distributions considered by Leising and Clayton (4) and the nucleosynthesis of the models of novae and SN of Woosley and his collaborators (5).

Type
Part III. Chemical and Dynamical Structures of Exploding Stars
Information
International Astronomical Union Colloquium , Volume 108: Atmospherics Diagnostics of Stellar Evolution: Chemical Peculiarity, Mass Loss, and Explosion , 1988 , pp. 442 - 443
Copyright
Copyright © Springer-Verlag 1988

References

(1) Share, G.H. et al., 1986, Advances in Space Res., 6, no 4, 145.CrossRefGoogle Scholar
(2) Ramaty, R., Llngenfelter, R.E., 1986, in “The Galactic Center”, Backer, D.C. Ed., AIP Publ., 155, N. Y., p. 155.Google Scholar
(3) Woosley, S.E., 1987, preprint.Google Scholar
(4) Leising, M.D., Clayton, D.D., 1985, Astrophys. J., 294, 591.CrossRefGoogle Scholar
(5) Woosley, S.E., 1986, “16th Advanced Course of the Swiss Academy of Astron, and Astrophys”, Hauck, B., Maeder, A. Ed., Genova and References.Google Scholar
(6) Signore, M., Vedrenne, G., 1987, sumbitted to Astron, and Astrophys.Google Scholar