Observation of the 0.511 MeV annihilation line from the inner Galaxy with the FIGARO II experiment

Details Observation of the 0.511 MeV annihilation line from the inner Galaxy with the FIGARO II experiment Observation of the 0.511 MeV annihilation line from the inner Galaxy with the FIGARO II experiment

Jun 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apj...356l..21n&link_type=abstract

Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 356, June 10, 1990, p. L21-L24. Research supported by CNES and AS

Astronomy and Astrophysics

Astrophysics

18

Galactic Nuclei, Galactic Structure, Line Spectra, Milky Way Galaxy, Positron Annihilation, Balloon-Borne Instruments, Field Of View, Gamma Rays, High Resolution

Scientific paper

A positive detection of the 0.511-MeV annihilation line from the inner Galaxy is reported. The observation has been performed with the Figaro II experiment (field of view 77 deg) during a balloon flight from Charleville, Australia on November 25-26, 1988. Assuming a single point source the flux is 0.00224 + or - 0.00041 photons/sq cm sec, while for an extended, disk source the differential flux is 0.00191 + or - 0.00032 photons/sq cm sec rad at the Galactic center.

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