Concordance: In-flight calibration of x-ray telescopes without absolute references (Conference Presentation)
Concordance: In-flight calibration of x-ray telescopes without absolute references (Conference Presentation)
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一致性：没有绝对参考的 X 射线望远镜的飞行中校准（会议演示）
DOI：
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发表时间：
2018
期刊：
影响因子：
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通讯作者：
J. Drake
中科院分区：
文献类型：
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作者：
H. Marshall;V. Kashyap;Matteo Guainazzi;Yang Chen;Xufei Wang;X. Meng;J. Drake
我们描述了一种交叉校准观测常见目标的x射线望远镜有效面积的过程。不假定目标是经典意义上的“标准烛光”，因为对源通量的唯一限制是所有仪器的源通量都是相同的。我们采用了Chen等人开发的技术（提交给J. Amer）。统计协会)，其中涉及一种流行的统计方法，称为收缩估计，它有效地减少了噪声在不同的测量通过组合信息跨越共同的观察。然后，我们可以确定每个仪器的有效面积校正系数，使所有天文台达到最佳协议，与先前对其有效面积的了解一致。我们有初步的值，描述了几乎所有操作（和一些过去的）x射线天文仪器在光子能量从0.15 keV到300 keV的波段上的有效区域的系统不确定度。我们用Chandra和XMM-Newton的几个数据集来验证该方法。
We describe a process for cross-calibrating the effective areas of X-ray telescopes that observe common targets. The targets are not assumed to be "standard candles" in the classic sense, in that the only constraint placed on the source flux is that it is the same for all instruments. We apply a technique developed by Chen et al. (submitted to J. Amer. Stat. Association) that involves a popular statistical method called shrinkage estimation, which effectively reduces the noise in disparate measurements by combining information across common observations. We can then determine effective area correction factors for each instrument that brings all observatories into the best agreement, consistent with prior knowledge of their effective areas. We have preliminary values that characterize systematic uncertainties in effective areas for almost all operational (and some past) X-ray astronomy instruments in bands covering factors of two in photon energy from 0.15 keV to 300 keV. We demonstrate the method with several data sets from Chandra and XMM-Newton.