Abstract
We have combined all OSSE spectra of the central radian of the Galaxy obtained through the end of 1994. These data have been searched for evidence of diffuse emission of nucleosynthetic γ-ray lines (22Na, 1.275 MeV: 60Fe, 1.17 and 1.33 MeV) and cosmic-ray induced γ-ray lines (de-excitation of 12C*, 4.44 MeV, and of 16O*, 6.13 MeV). We have looked in detail at possible systematic errors in the line measurements. Our preliminary results show no evidence for the presence of either broad or narrow cosmic-ray induced lines, nor for emission from 22Na, down to 3 σ upper limits ≃ 2 10-4 γ/(cm2-secrad). We find weak evidence (≈ 2σ) of 60Fe line emission from positive Galactic longitudes in the central radian.
Original language | English (US) |
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Pages (from-to) | 343-347 |
Number of pages | 5 |
Journal | Astronomy and Astrophysics Supplement Series |
Volume | 120 |
Issue number | 4 |
State | Published - 1996 |
Keywords
- Abundances - Gamma-rays
- Cosmic rays - Galaxy
- Nuclear reactions, nucleosynthesis, abundances - Ism
- Observations
ASJC Scopus subject areas
- Physics and Astronomy(all)