Search for nucleosynthetic and cosmic-ray induced γ-ray lines from the Galactic plane

M. J. Harris*, W. R. Purcell, D. A. Grabelsky, W. N. Johnson, G. V. Jung, R. L. Kinzer, J. D. Kurfess, K. McNaron-Brown, M. S. Strickman, M. P. Ulmer

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

8 Scopus citations

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 languageEnglish (US)
Pages (from-to)343-347
Number of pages5
JournalAstronomy and Astrophysics Supplement Series
Volume120
Issue number4
StatePublished - Dec 1 1996

Keywords

  • Abundances - Gamma-rays
  • Cosmic rays - Galaxy
  • Nuclear reactions, nucleosynthesis, abundances - Ism
  • Observations

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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