| タイトル | Spectrum and variation of gamma-ray emission from the galactic center region |
| 著者（英） | Jacobson, A. S.; Mahoney, W. A.; Riegler, G. R.; Ling, J. C.; Wheaton, W. A. |
| 著者所属（英） | Jet Propulsion Lab., California Inst. of Tech. |
| 発行日 | 1982-01-01 |
| 言語 | eng |
| 内容記述 | Continuum emission at 60-300 keV from the galactic center region was observed to decrease in intensity by 45 percent and to show a spectrum steepening between fall 1979 and spring 1980. At the same time 511 keV positron annihilation radiation decreased by a comparable fraction. No variations over shorter time scales were detected. The observations are consistent with a model where positrons and hard X-rays are produced in an electromagnetic cascade near a massive black hole. |
| NASA分類 | ASTRONOMY |
| レポートNO | 82A30395 |
| 権利 | Copyright |
| URI | https://repository.exst.jaxa.jp/dspace/handle/a-is/410968 |
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