论文标题
2003-2019通过整体SPI监测螃蟹排放，反之亦然
2003-2019 Monitoring of the Crab emission through INTEGRAL SPI, or vice versa
论文作者
论文摘要
许多仪器将螃蟹星云用作校准来源，特别是在高能的校准来源，它是最亮的天体物体之一。自2002年10月以来，光谱仪积分SPI（20 KEV -8 MEV）正在运行，提供了一个专门针对该来源的大型数据集，每年计划两次常规广告系列。我们已经分析了可用数据，以长期量表量化源行为，并检查时间表的稳定性水平。结果，对于覆盖20 keV -400 keV能量域的宽带，源通量可变性似乎在+/- 5％以下的+/- 5％之内包含，而统计数据限制了任何公司结论。在光谱形状方面，频带模型对观察到的20 keV和2.2 MeV之间的发射提供了很好的描述。平均频谱最佳拟合参数对应于1.99 +/- 0.01的低能斜率，高能坡度为-2.32 +/- 0.02和531 +/- 50 keV的特征能量E C，以描述连接两种功率定律的曲率。然后，已经确定了频谱参数在革命时间尺度上（〜1至2天），它们的稳定性确认了源排放稳定性。 作为互补的结果，这项研究表明，在运行17年后，SPI仪器效率保持在其初始值的5％之内。
The Crab Nebula is used by many instruments as a calibration source, in particular at high energy, where it is one of the brightest celestial object. The spectrometer INTEGRAL SPI (20 keV - 8 MeV), in operation since October 2002, offers a large dataset dedicated to this source, with regular campaigns planned twice per year. We have analyzed the available data to quantify the source behavior on a long term scale and examine the stability level on timescales from hour to years. As a result, the source flux variability appears to be contained within less than +/- 5% around a ~ 20 yr mean value, for broad bands covering the 20 keV - 400 keV energy domain, above which statistic limits any firm conclusion. In term of spectral shape, the Band model provides a good description of the observed emission between 20 keV and 2.2 MeV. The averaged spectrum best fit parameters correspond to a low energy slope of 1.99 +/- 0.01, a high energy slope of -2.32 +/- 0.02 and a characteristic energy E c of 531 +/- 50 keV to describe the curvature joining both power laws. The spectral parameters have then been determined on the revolution timescale (~ 1 to 2 days) and their steadiness confirms the source emission stability. As a complementary result, this study demonstrates that the SPI instrument efficiency remains within 5% of its initial value, after 17 years of operation.
