The Galactic Positron Annihilation Radiation & The Propagation of Positrons in the Interstellar Medium

Details The Galactic Positron Annihilation Radiation & The Propagation of Positrons in the Interstellar Medium The Galactic Positron Annihilation Radiation & The Propagation of Positrons in the Interstellar Medium

2007-11-19

arxiv.org/abs/0711.3008v3

Astrophys.J.698:350-379,2009

Astronomy and Astrophysics

Astrophysics

40 pages, 4 postscript figures, 7 tables, accepted for publication in the Astrophysical Journal, volume 698, June 2009

Scientific paper

10.1088/0004-637X/698/1/350

We consider positron propagation in the interstellar medium and show that the positrons from the beta-plus decay chains of the radioactive nuclei Ni-56, Ti-44, and Al-26, produced in Galactic supernovae, can fully account for all the features of the diffuse Galactic 511 keV annihilation radiation observed by INTEGRAL/SPI. We also predict additional measurable features that can further test the origin of positrons and provide new information on the nature of the interstellar medium.

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