空间载伽马射线望远镜观测：来自 INTEGRAL 的选定结果
摘要
国际伽马射线天文实验室，即自费罗卫星，已在约 3 年时间处于轨道，执行 15 keV 至 8 MeV 能量范围内的天空伽马射线观测。凭借其成像仪 IBIS，特别是基于 16384 个 CdTe 像素的 ISGRI 检测平面，实现了对点源研究的卓越角分辨率（12 弧分），并具有良好的连续光谱灵敏度。凭借其光谱仪器 SPI，基于 19 个德国仪器探测器， maintained at 85 K by a cryogenic system, located inside an active BGO veto shield, it achieves excellent spectral resolution of about 2 keV for 1 MeV photons, which permits astrophysical gamma-ray line studies with good narrow-line sensitivity. In this paper we review some goals of gamma-ray astronomy from space and present the INTEGRAL satellite, in particular its instruments ISGRI and SPI. Ground and in-flight calibration results from SPI are presented, before presenting some selected astrophysical results from INTEGRAL. In particular results on point source searches are presented, followed by results on nuclear astrophysics, exemplified by the study of the 1809 keV gamma-ray line from radioactive 26Al nuclei produced by the ongoing stellar nucleosynthesis in the Galaxy. Finally a review on the study of the positron-electron annihilation in the Galactic center region, producing 511 keV gamma-rays, is presented.
引用
@article{arxiv.astro-ph/0606553,
title = {Observing with a space-borne gamma-ray telescope: selected results from INTEGRAL},
author = {S. Schanne},
journal= {arXiv preprint arXiv:astro-ph/0606553},
year = {2007}
}
备注
Invited talk at the NPDC19 Conference of the European Physical Society, Pavia, September 2005. Published in the IoP J. Phys. (2006) Conf. Ser. 41 46-60