标题： 蟹状星云的探测与成像与核康普顿望远镜 显示英文标题

标题： Detection and Imaging of the Crab Nebula with the Nuclear Compton Telescope

摘要： 核康普顿望远镜（NCT）是一种系留气球的康普顿望远镜，用于研究软伽马射线范围（200 keV-20 MeV）内的天体物理源。NCT的十个高纯度锗交叉条探测器测量敏感体积内伽马射线相互作用的沉积能量和三维位置，这些信息用于使用康普顿散射技术将初始光子限制在天空上的一个圆上。因此，NCT能够对软伽马射线源进行光谱分析、成像和偏振分析。NCT是下一代康普顿望远镜——所谓的小型康普顿望远镜（CCTs）之一，其有效面积可以与COMPTEL相媲美，而仪器的尺寸仅为COMPTEL的一小部分。蟹状星云是NCT仪器第二次飞行的主要目标，该次飞行于2009年5月17日至18日在新墨西哥州的福特森纳进行。对飞行中29.3 ks数据的分析揭示了蟹状星云在4-sigma显著性水平下的图像。这是由CCT首次报告的天体物理源的检测。 显示英文摘要

摘要： The Nuclear Compton Telescope (NCT) is a balloon-borne Compton telescope designed for the study of astrophysical sources in the soft gamma-ray regime (200 keV--20 MeV). NCT's ten high-purity germanium crossed-strip detectors measure the deposited energies and three-dimensional positions of gamma-ray interactions in the sensitive volume, and this information is used to restrict the initial photon to a circle on the sky using the Compton scatter technique. Thus NCT is able to perform spectroscopy, imaging, and polarization analysis on soft gamma-ray sources. NCT is one of the next generation of Compton telescopes --- so-called compact Compton telescopes (CCTs) --- which can achieve effective areas comparable to COMPTEL's with an instrument that is a fraction of the size. The Crab Nebula was the primary target for the second flight of the NCT instrument, which occurred on 17--18 May 2009 in Fort Sumner, New Mexico. Analysis of 29.3 ks of data from the flight reveals an image of the Crab at a significance of 4-sigma. This is the first reported detection of an astrophysical source by a CCT.