RXTE正比计数器阵列校准的进展：接近统计极限
Advances in the RXTE Proportional Counter Array Calibration: Nearing the Statistical Limit
摘要：
在其16年的服务期间，罗西X射线定时探测器（RXTE）任务提供了广泛的数据档案，这些数据将作为快速定时研究的可变X射线源的高节奏观测的主要来源。因此，对RXTE仪器进行最可靠的校准非常重要。正比计数器阵列（PCA）是RXTE的主要机载仪器，可在多达256个能量通道中提供3-50 keV能量范围内的数据，具有亚毫秒级时间分辨率。2009年，RXTE团队修改了用于导出PCA物理模型参数的响应残差最小化方法。该程序是基于残差最小化的蟹状星云发射的模型光谱和校准数据集组成的一些光谱的蟹状星云和机载Am 241校准源，均匀覆盖整个RXTE任务运行期间。新方法导致更有效的模型收敛，并允许更好地理解PCA能量与通道的关系。它大大提高了响应矩阵的性能。我们描述了新版本的RXTE/PCA响应生成器PCARMF v11.7（HEASOFT版本6.7）以及相应的能量-通道转换表（版本e05 v04）以及它们与先前版本的PCA校准的差异。新的PCA响应充分代表了校准源的光谱，并成功地预测了整个RXTE任务中Cas-A中窄铁发射线的能量。
英文摘要：
During its 16 years of service the Rossi X-ray Timing Explorer (RXTE) mission has provided an extensive archive of data, which will serve as a primary source of high cadence observations of variable X-ray sources for fast timing studies. It is, therefore, very important to have the most reliable calibration of RXTE instruments. The Proportional Counter Array (PCA) is the primary instrument on-board RXTE which provides data in 3-50 keV energy range with sub-millisecond time resolution in up to 256 energy channels. In 2009 the RXTE team revised the response residual minimization method used to derive the parameters of the PCA physical model. The procedure is based on the residual minimization between the model spectrum for Crab nebula emission and a calibration data set consisting of a number of spectra from the Crab and the on-board Am241 calibration source, uniformly covering the whole RXTE mission operation period. The new method led to a much more effective model convergence and allowed for better understanding of the PCA energy-to-channel relationship. It greatly improved the response matrix performance. We describe the new version of the RXTE/PCA response generator PCARMF v11.7 (HEASOFT Release 6.7) along with the corresponding energy-to-channel conversion table (verson e05v04) and their difference from the previous releases of PCA calibration. The new PCA response adequately represents the spectrum of the calibration sources and successfully predicts the energy of the narrow iron emission line in Cas-A throughout the RXTE mission.
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