The Galactic Positron Annihilation Radiation Bulge to Disk Ratio Explained

Details The Galactic Positron Annihilation Radiation Bulge to Disk Ratio Explained The Galactic Positron Annihilation Radiation Bulge to Disk Ratio Explained

May 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008aas...212.5206r&link_type=abstract

American Astronomical Society, AAS Meeting #212, #52.06; Bulletin of the American Astronomical Society, Vol. 40, p.249

Astronomy and Astrophysics

Astronomy

Scientific paper

The Galactic bulge/disk ratio of the 511 keV positron annihilation line measured by INTEGRAL is 2. This ratio is roughly a factor of 5 larger than that expected simply from the bulge/disk ratio of 0.3 of Galactic supernovae, which are thought to be the principal source of 511 keV photons through the decay of radionuclei created by explosive nucleosynthesis. We show that this origin holds true if detailed propagation of the MeV positrons in various phases of the ISM is taken into consideration. We predict that the bulk of the broad ( 5.4 keV FWHM) line emission comes from the 0.5 kpc

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