NASA Logo

NTRS

NTRS - NASA Technical Reports Server

Back to Results
SMM detection of diffuse Galactic 511 keV annihilation radiationObservations of the 511 keV annihilation line from the vicinity of the Galactic center from October to February for 1980/1981, 1981/1982, 1982/1983, 1984/1985, and 1985/1986 are presented. The measurements were made with the gamma-ray spectrometer on the SMM. The design of the instrument and some of its properties used in the analysis are described, and the methods used for accumulating, fitting, and analyzing the data are outlined. It is shown how the Galactic 511 keV line was separated from the intense and variable background observed in orbit. The SMM observations are compared with previous measurements of annihilation radiation from the Galactic center region, and the astrophysical implications are discussed. It is argued that most of the measurements made to date suggest the presence of an extended Galactic source of annihilation radiation.
Document ID
19880044692
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Share, G. H. (Hulburt (E. O.) Center for Space Research Washington, DC, United States)
Kinzer, R. L. (Hulburt (E. O.) Center for Space Research Washington, DC, United States)
Kurfess, J. D. (Hulburt (E. O.) Center for Space Research Washington, DC, United States)
Messina, D. C. (Hulburt (E. O.) Center for Space Research Washington, DC, United States)
Purcell, W. R. (U.S. Navy, E. O. Hulburt Center for Space Research, Washington DC, United States)
Date Acquired
August 13, 2013
Publication Date
March 15, 1988
Publication Information
Publication: Astrophysical Journal, Part 1
Volume: 326
ISSN: 0004-637X
Subject Category
SPACE RADIATION
Funding Number(s)
CONTRACT_GRANT: BMFT-010K-017-ZA/WS/WRK-02754
CONTRACT_GRANT: NASA ORDER S-14513-D
CONTRACT_GRANT: NAS5-28609
Distribution Limits
Public
Copyright
Other