AI 中文总结
本研究通过独立光谱分析推导STIS CCD旋转角与旋转率，发现其旋转对各光栅影响一致，结果与早期测量吻合，助力STIS CCD旋转监测及校准精度提升。
AI 中文摘要
已有研究表明STIS CCD存在缓慢旋转，这可从光谱迹线变化和平场演化中看出。本仪器科学报告中，我们对CCD旋转角开展独立光谱分析，并与此前研究进行对比。我们描述了推导不同光栅和中心波长下旋转角与旋转率的方法，报告了对应的随时间变化的中位旋转率。结果在不确定度范围内与早期测量大体一致，表明CCD旋转对所有CCD光栅的影响相同。我们还讨论了限制本分析的关键假设，这些发现有助于持续监测STIS CCD旋转及其对校准精度的影响。
英文摘要
It has been previously studied that the STIS CCD exhibits a slow rotation, evident from changes in spectral traces and flat-field evolution. In this Instrument Science Report, we present an independent spectroscopic analysis of the CCD rotation angle and a comparison with previous studies. We describe the methodology used to derive rotation angles and rates across different gratings and central wavelengths, and report the corresponding median rotation rates over time. The results are broadly consistent within uncertainties with earlier measurements, indicating the CCD rotation has the same impact on all the CCD gratings. We also discuss key assumptions limiting our analysis. These findings contribute to the ongoing monitoring of STIS CCD rotation and its implications for calibration accuracy.
Comments26 pages, 16 figures, 3 tables
