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Hard X-ray/soft gamma-ray observations of the Galactic diffuse emission with INTEGRAL/SPI

机译:硬X射线/软伽马射线与整体/ SPI的半乳液漫射发射观察

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The spectrometer SPI, onboard the INTEGRAL observatory, gives us a unique opportunity to study the hard X-ray/soft gamma-ray diffuse emission. Based on a total observation time of 108 s performed in more than 6 years of operation, we have measured a detailed ridge spectrum and constrained the spatial distribution of the emission from 20 keV to 2.5 MeV. The interstellar part of the ridge emission can be explained by inverse-Compton scattering from relativistic electrons on the cosmic microwave background and the Galactic infrared/optical radiation fields. The spectrum and its spatial distribution is compared with predictions from GALPROP modelling. We show also the potential of SPI data for determining the electron spectrum at low GeV energy where the solar modulation makes any direct measures of the electron spectrum difficult to interpret.
机译:光谱仪SPI,板载整体天文台,为我们提供了研究硬X射线/软伽马射线漫射排放的独特机会。基于108秒的总观察时间在超过6年的操作中进行,我们测量了详细的脊谱,并限制了20 kev到2.5 mev的发射的空间分布。脊发射的星际部分可以通过在宇宙微波背景和银河红外/光学辐射场上的相对论电子散射来解释。将频谱及其空间分布与Galprop建模的预测进行了比较。我们还示出了SPI数据的潜力,用于在低GEV能量下确定电子光谱,其中太阳调制使得难以解释的电子光谱的任何直接测量。

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