OSSE observations of positron annihilation in the Galactic plane.

Details OSSE observations of positron annihilation in the Galactic plane. OSSE observations of positron annihilation in the Galactic plane.

Dec 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996a%26as..120c.317k&link_type=abstract

Astronomy and Astrophysics Supplement, v.120, p.317-320

Astronomy and Astrophysics

Astrophysics

22

Galaxy: Structure, Galaxy: Center, Gamma Rays: Observations

Scientific paper

OSSE has measured the galactic longitude distribution of both the 511keV annihilation line radiation and the three-photon positronium continuum within ~40° of the center. They have similar shapes, with a composite longitude distribution well represented by an ~11° FWHM Gaussian central bulge together with a possible broad disk component comprising as much as 15% of the integral flux between 40° and 320° longitude. Contributions from one or more discrete source(s) at or near the center with total annihilation radiation (line plus continuum) intensities of up to ~4x10^-4^photons/cm^2^/s (2σ upper limit) are compatible with the observed distribution. The best estimate of the positronium fraction is 0.97+/-0.03. No evidence for variation in the positronium fraction is observed.

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