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A study of background for IXPE
Astroparticle Physics ( IF 3.5 ) Pub Date : 2021-02-06 , DOI: 10.1016/j.astropartphys.2021.102566
F. Xie , R. Ferrazzoli , P. Soffitta , S. Fabiani , E. Costa , F. Muleri , Di Marco

Focal plane X-ray polarimetry is intended for relatively bright sources with a negligible impact of background. However this might not be always possible for IXPE (Imaging X-ray Polarimetry Explorer) when observing faint extended sources like supernova remnants. We present for the first time the expected background of IXPE by Monte Carlo simulation and its impact on real observations of point and extended X-ray sources. The simulation of background has been performed by Monte Carlo based on GEANT4 framework. The spacecraft and the detector units have been modeled, and the expected background components in IXPE orbital environment have been evaluated. We studied different background rejection techniques based on the analysis of the tracks collected by the Gas Pixel Detectors on board IXPE. The estimated background is about 2.9 times larger than the requirement, yet it is still negligible when observing point like sources. Albeit small, the impact on supernova remnants indicates the need for a background subtraction for the observation of the extended sources.



中文翻译:

IXPE的背景研究

焦平面X射线极化仪旨在用于相对明亮的源,而对背景的影响可忽略不计。但是,当观察微弱的扩展源(例如超新星残留物)时,对于IXPE(成像X射线极化仪)而言,这可能并不总是可行的。我们首次通过蒙特卡洛模拟展示了IXPE的预期背景及其对点和扩展X射线源的真实观测的影响。蒙特卡洛基于GEANT4框架对背景进行了仿真。对航天器和探测器单元进行了建模,并对IXPE轨道环境中预期的背景成分进行了评估。我们基于对IXPE板上气体像素检测器收集的轨迹的分析,研究了不同的背景抑制技术。估计背景约为2。比要求大9倍,但在观察像点这样的源时仍然可以忽略不计。尽管很小,但对超新星残留物的影响表明需要对背景进行减法以观察扩展源。

更新日期:2021-02-15
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