New constraints on the positron annihilation media from the direction of the Galactic center based on the 511 keV line profiles

Details New constraints on the positron annihilation media from the direction of the Galactic center based on the 511 keV line profiles New constraints on the positron annihilation media from the direction of the Galactic center based on the 511 keV line profiles

Feb 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993apj...403..621w&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 403, no. 2, p. 621-629.

Astronomy and Astrophysics

Astrophysics

10

Galactic Nuclei, Line Spectra, Milky Way Galaxy, Positron Annihilation, Astronomical Spectroscopy, Interstellar Matter, Molecular Clouds, Point Sources

Scientific paper

We present an analysis of the profiles and intensities of the 511 keV annihilation line observed in the direction of the Galactic center by high energy resolution detectors. We first investigate the HEXAGONE 1989 May data, where the point source was in a rather low state. We find that a warm medium (temperature of 8000 K) can describe the annihilation of the positrons from the diffuse component of the line. We compare these results with the Bell/Sandia 1977, and GRIS 1988 October flights during high states of the central source, and we then show that the discrepancy in the line shape and width between these two sets of data is explained if the time-variable component of the line coming from the annihilation of the positrons emitted by the central source annihilates in a cold medium around 80 K).

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