| タイトル | The gamma-ray spectrum of the Galactic center region |
| 著者（英） | Mahoney, W. A.; Wheaton, W. A.; Jacobson, A. S.; Ling, J. C.; Riegler, G. R. |
| 著者所属（英） | Jet Propulsion Lab., California Inst. of Tech. |
| 発行日 | 1985-07-01 |
| 言語 | eng |
| 内容記述 | The Galactic center region was observed with the HEAO 3 High Resolution Gamma-Ray Spectrometer during the fall of 1979 and the spring of 1980. Between these epochs there was observed (1) a statistically significant decrease in the high-energy (511 keV to about 3 MeV) luminosity, (2) a decrease in the positron annihilation line intensity, reported previousy, and (3) a low positronium annihilation fraction f = 0.38 + or 0.19 during the fall of 1979. If positrons are generated by photon-photon collisions of high-energy photons, then the absence of a detected flux above 511 keV in the spring of 1980 may indicate a time delay between positron production and annihilation. |
| NASA分類 | ASTROPHYSICS |
| レポートNO | 85A43032 |
| 権利 | Copyright |
| URI | https://repository.exst.jaxa.jp/dspace/handle/a-is/390266 |
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