| タイトル | An observation of the Galactic center region with the HEXAGONE high resolution gamma-ray spectrometer |
| 著者（英） | Lin, R.; Bowman, B.; Gruber, D.; Smith, D.; Feffer, P.; Matteson, J.; Peterson, L.; Lingenfelter, R.; Pelling, M.; Briggs, M. |
| 著者所属（英） | NASA Headquarters |
| 発行日 | 1991-01-01 |
| 言語 | eng |
| 内容記述 | The Galactic center region was observed for 6 hours on May 22, 1989 from a high altitude balloon with the HEXAGONE high resolution gamma-ray spectrometer. The instrument had a 285 sq/cm array of cooled germanium detectors with an energy resolution of 2.2 keV at 511 keV and an 18 deg FWHM field of view. The 511 keV gamma-rays from electron-positron annihilation and 1809 keV gamma-rays from the radioactive decay of Al-26 were observed to have fluxes of 8.9 x 10 exp -4 and 1.9 x 10 exp -4 ph/cm-s, respectively. Continuum emission was detected from 20 to 800 keV and preliminary results have been obtained for the spectrum. Below 120 keV this is well described by power law with a slope of -2.6. In the 120-250 keV band the spectrum contains a broad linelike feature. This is interpreted as the result of Compton backscattering of about 511 keV photons from a compact source of electron-positron annihilation radiation. |
| NASA分類 | ASTROPHYSICS |
| レポートNO | 92A43624 |
| 権利 | Copyright |
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