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A New Strategy for Deep Wide-Field High-Resolution Optical Imaging

机译:深广域高分辨率光学成像的新策略

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摘要

We propose a new strategy for obtaining enhanced-resolution (FWHM approx= 0".12) deep optical images over a wide field of view. As is well known, this type of image quality can be obtained in principle simply by fast guiding on a small (D ~1.5 m) telescope at a good site, but only for target objects which lie within a limited angular distance around a suitably bright guide star. For high-altitude turbulence this isokinetic angle is approximately 1'. With a 1° field say, one would need to track and correct the motions of thousands of isokinetic patches, yet there are typically too few sufficiently bright guide stars to provide the necessary guiding information. Our proposed solution to these problems has two novel features. The first is to use orthogonal transfer CCD technology to effectively implement a wide-field rubble focal plane detector composed of an array of cells which can be guided independently. The second is to combine measured motions of a set of guide stars made with an array of telescopes to provide the extra information needed to fully determine the deflection field. We discuss the performance, feasibility, and design constraints of a system which would provide the collecting area equivalent to a single 9 m telescope, a 1 degree square field, and FWHM approx= 0".12 image quality.
机译:我们提出了一种在较宽的视野范围内获得高分辨率(FWHM近似= 0“ .12)的深光学图像的新策略。众所周知,这种类型的图像质量原则上可以通过快速引导小型(D〜1.5 m)望远镜,位于良好的位置,但仅适用于围绕适当明亮的恒星的有限角度距离内的目标物体;对于高空湍流,该等速角约为1',场强为1°例如,一个人需要跟踪和校正数千个等速斑块的运动,但是通常很少有足够明亮的导星来提供必要的指导信息,我们针对这些问题提出的解决方案具有两个新颖的特征:第一个是使用正交传输CCD技术有效地实现了由可独立引导的细胞阵列组成的宽场瓦砾焦平面检测器;其次是结合由ar制成的一组引导星的测量运动望远镜提供全面确定偏转场所需的额外信息。我们讨论了系统的性能,可行性和设计约束,该系统将提供相当于一个9 m望远镜,1度方镜和FWHM近似= 0“ .12图像质量的收集区域。

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