使用INTEGRAL上的SPI对Gamma-Ray天空进行成像
Imaging the Gamma-Ray Sky with SPI aboard INTEGRAL
摘要：
INTEGRAL上的光谱仪SPI首次允许在硬X射线和软伽马射线范围内同时成像扩散和点状发射。为了充分利用仪器的功能，我们实现了MREM图像去卷积算法，最初开发的COMPTEL数据分析，SPI数据分析。我们提出的算法的性能通过模拟和应用它的数据积累在第一个2任务年的INTEGRAL。Skymaps的1809千电子伏的伽马射线线，归因于26铝的放射性衰变，和连续能带，覆盖范围为20千电子伏- 3兆电子伏。1809千电子伏的地图表明，SPI清楚地检测到了来自银河系内弧度和天鹅座区域的辐射。连续谱图揭示了点源为主的硬X射线天空到漫发射为主的软伽马射线天空之间的过渡。从天空图中，我们提取了银河脊发射光谱，以及SPI模型拟合得到的结果相匹配。通过比较我们的光谱与IBIS从点源测得的累积通量，我们发现了一个未解决的或漫发射组件的存在的迹象高于~100千电子伏。
英文摘要：
The spectrometer SPI on INTEGRAL allows for the first time simultaneous imaging of diffuse and point-like emission in the hard X-ray and soft gamma-ray regime. To fully exploit the capabilities of the instrument, we implemented the MREM image deconvolution algorithm, initially developed for COMPTEL data analysis, to SPI data analysis. We present the performances of the algorithm by means of simulations and apply it to data accumulated during the first 2 mission years of INTEGRAL. Skymaps are presented for the 1809 keV gamma-ray line, attributed to the radioactive decay of 26Al, and for continuum energy bands, covering the range 20 keV - 3 MeV. The 1809 keV map indicates that emission is clearly detected by SPI from the inner Galactic radian and from the Cygnus region. The continuum maps reveal the transition between a point-source dominated hard X-ray sky to a diffuse emission dominated soft gamma-ray sky. From the skymaps, we extract a Galactic ridge emission spectrum that matches well SPI results obtained by model fitting. By comparing our spectrum with the cumulative flux measured by IBIS from point sources, we find indications for the existence of an unresolved or diffuse emission component above ~100 keV.
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