XMM-牛顿EPIC望远镜点扩展函数的一个新的全面的2-D模型：杂散源抑制和改进的定位精度
A New Comprehensive 2-D Model of the Point Spread Functions of the XMM-Newton EPIC Telescopes : Spurious Source Suppression and Improved Positional Accuracy
摘要：
在这里，我们描述了一个新的完整的2-D参数化的PSF的三个XMM-牛顿EPIC望远镜的仪器，能量，离轴角和方位角的函数，覆盖整个领域的三个EPIC探测器的视野。它模拟了一般PSF包络、主轮辐和次轮辐、它们的径向依赖性以及大尺度方位角变化。这个PSF模型已经通过堆叠和集中大量的明亮的，但不显着堆积的点源从每个EPIC检测器的全视场，并方位角过滤所得的PSF包络线，以形成辐条结构和观察到的总方位角形状。通过使用当前校准文件XRTi_XPSF_0011.CCF和更高版本，该PSF模型可用于XMM-Newton Science分析系统。最初的源搜索测试表明，在亮点源的翅膀中检测到的虚假源的数量大幅减少。此外，我们还发现了以前PSF系统中的一个系统误差，影响到迄今为止的整个任务，由此可以看到返回的源RA和Dec值随源方位角位置关于真实位置（振幅~0.8 "）呈正弦变化。新的点扩散函数系统现已投入使用，被视为在探测虚假源方面的重大改进。新的PSF还在很大程度上消除了发现的天体测量误差，并被认为是提高了EPIC的位置精度。PSF系统的模块化性质允许在未来进一步改进。
英文摘要：
We describe here a new full 2-D parameterization of the PSFs of the three XMM-Newton EPIC telescopes as a function of instrument, energy, off-axis angle and azimuthal angle, covering the whole field-of-view of the three EPIC detectors. It models the general PSF envelopes, the primary and secondary spokes, their radial dependencies, and the large-scale azimuthal variations. This PSF model has been constructed via the stacking and centering of a large number of bright, but not significantly piled-up point sources from the full field-of-view of each EPIC detector, and azimuthally filtering the resultant PSF envelopes to form the spoke structures and the gross azimuthal shapes observed. This PSF model is available for use within the XMM-Newton Science Analysis System via the usage of Current Calibration Files XRTi_XPSF_0011.CCF and later versions. Initial source-searching tests showed substantial reductions in the numbers of spurious sources being detected in the wings of bright point sources. Furthermore, we have uncovered a systematic error in the previous PSF system, affecting the entire mission to date, whereby returned source RA and Dec values are seen to vary sinusoidally about the true position (amplitude ~0.8") with source azimuthal position. The new PSF system is now available and is seen as a major improvement with regard to the detection of spurious sources. The new PSF also largely removes the discovered astrometry error and is seen to improve the positional accuracy of EPIC. The modular nature of the PSF system allows for further refinements in the future.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
