论文标题
使用JWST的光度法和天文学-II。 Nircam失真校正
Photometry and astrometry with JWST -- II. NIRCam distortion correction
论文作者
论文摘要
为了准备充分利用我们计划的詹姆斯·韦伯太空望远镜调查，我们利用了公开可用的校准和早期科学观察，独立得出并测试了NIRCAM探测器的几何距离解决方案。我们的解决方案能够纠正比〜0.2 mas更好的变形。当前数据表明该解决方案在研究的过滤器，时间覆盖范围甚至可用过滤器组合上都是稳定且恒定的。在三种情况下，我们成功地测试了我们的几何渗透解决方案：（i）M 92场的场对象净化； （ii）M 92内部适当运动的估计； （iii）测量大型麦哲伦云系统的内部适当运动。据我们所知，NIRCAM的此处衍生的几何距离解决方案是最好的，我们公开释放它，因为许多其他调查可能会从中受益。除了我们的几何距离解决方案外，我们还释放了一个Python工具，将每个检测器的原始像素坐标转换为无失真位置，并将NIRCAM的所有十个检测器都放入一个共同的参考系统中。
In preparation to make the most of our own planned James Webb Space Telescope investigations, we take advantage of publicly available calibration and early-science observations to independently derive and test a geometric-distortion solution for NIRCam detectors. Our solution is able to correct the distortion to better than ~0.2 mas. Current data indicate that the solution is stable and constant over the investigated filters, temporal coverage, and even over the available filter combinations. We successfully tested our geometric-distortion solution in three cases: (i) field-object decontamination of M 92 field; (ii) estimate of internal proper motions of M 92; and (iii) measurement of the internal proper motions of the Large Magellanic Cloud system. To our knowledge, the here-derived geometric-distortion solution for NIRCam is the best available and we publicly release it, as many other investigations could potentially benefit from it. Along with our geometric-distortion solution, we also release a Python tool to convert the raw-pixels coordinates of each detector into distortion-free positions, and also to put all the ten detectors of NIRCam into a common reference system.
