Astronomy and Astrophysics – Astrophysics
Scientific paper
1998-03-20
Astronomy and Astrophysics
Astrophysics
20 pp., 4 figs. Ap. J. Letters in press
Scientific paper
10.1086/311429
We have obtained spectra of the Galactic center at energies 400-600 keV from high-resolution data acquired by the TGRS Ge spectrometer 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 line-to-continuum ratio allow some constraints to be placed on the interstellar sites where annihilation occurs.
Cline Thomas L.
Gehrels Neil
Harris Mark J.
Palmer David M.
Ramaty Reuven
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