De-excitation C and O lines and the 511 keV annihilation line from Sgr A*

V. A. Dogiel, K. S. Cheng, D. O. Chernyshov, V. Tatischeff, C. M. Ko, W. H. Ip

Research output: Contribution to journalShort surveypeer-review

4 Scopus citations


We present a model of the observed annihilation emission from the Galactic center. From our estimations it follows that this region should emit also a flux of de-excitation C and O lines at the level ≤10-5 ph cm-2 s-1. From restrictions based on the observed >100 MeV gamma-ray flux from the Galactic center, ∼2 × 10-5 ph cm-2 s-1, we predict that the calculated gamma-ray line flux below 8 MeV is about 2.5 × 10- 5 ph cm- 2 s- 1. A specific line is the one at 1.809 MeV from radioactivity of 26Al. The predicted quasi-stationary flux of the 26Al 1.809 MeV line from the 1 ° × 1 ° central region is ≤ 10- 6 ph cm- 2 s- 1.

Original languageEnglish
Pages (from-to)460-462
Number of pages3
JournalNew Astronomy Reviews
Issue number7-10
StatePublished - Oct 2008


  • 511 keV line
  • Black hole
  • De-excitation lines
  • Secondary positrons


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