Transient Gamma-Ray Spectrometer Measurements of the Positron Annihilation Spectrum from the Galactic Center
- 1 July 1998
- journal article
- research article
- Published by American Astronomical Society in The Astrophysical Journal
- Vol. 501 (1) , L55-L58
- https://doi.org/10.1086/311429
Abstract
We have obtained spectra of the Galactic center at energies of 400-600 keV from high-resolution data acquired by the Transient Gamma-Ray Spectrometer Ge detector on board the WIND mission during 1995-1997. The data were obtained using an on-board occulter and are relatively free from systematics and backgrounds. Analysis of the spectra reveals a well-resolved electron-positron annihilation line at 511 keV and the associated continuum due to annihilation via positronium formation. Measurements of the line width and the continuum-to-line ratio allow some constraints to be placed on the interstellar sites where annihilation occurs.Keywords
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This publication has 13 references indexed in Scilit:
- OSSE Mapping of Galactic 511 keV Positron Annihilation Line EmissionThe Astrophysical Journal, 1997
- HEAO 3 observations of the Galactic center 511 keV lineThe Astrophysical Journal Supplement Series, 1994
- GRIS detections of the 511 keV line from the Galactic center region in 1992The Astrophysical Journal, 1993
- Positron annihilation in the interstellar mediumThe Astrophysical Journal, 1991
- Galactic center positronium fraction - Observations and simulationsThe Astrophysical Journal, 1987
- Direct-annihilation fraction of positrons in a neutral low-density galactic environmentPhysical Review A, 1986
- The annihilation of galactic positronsThe Astrophysical Journal, 1979
- Detection of 511 keV positron annihilation radiation from the galactic center directionThe Astrophysical Journal, 1978
- Energy spectra of X-ray clusters of galaxiesThe Astrophysical Journal, 1976
- Parameter estimation in X-ray astronomyThe Astrophysical Journal, 1976