PSF reconstruction for AO photometry and astrometry
PSF reconstruction for AO photometry and astrometry
复制标题
用于 AO 光度测量和天体测量的 PSF 重建
DOI：
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发表时间：
2016
期刊：
影响因子：
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通讯作者：
T. Fusco
中科院分区：
文献类型：
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作者：
J. Ascenso;B. Neichel;Manuel Silva;T. Fusco
从自适应光学辅助仪器拍摄的图像中提取准确的光度（和天体测量）尤其具有挑战性。目前的后处理工具还没有准备好从AO数据中获得高精度，特别是在拥挤的领域和边际解析源的有限情况下。我们用合成图像量化了这些工具的局限性，并提出了一项概念验证研究，显示了使用（GL）AO系统遥测重建的psf来提高测量光度精度的潜力。我们表明，在相当拥挤的地区，通过良好的PSF重建，光度精度显着提高。我们证明需要一个专门的后处理工具，该工具包含有关PSF的可用信息，以及适应AO数据PSF特征的空间变化的能力。
Extracting accurate photometry (and astrometry) from images taken with adaptive optics assisted instruments is particularly challenging. Current post-processing tools are not prepared to achieve high accuracy from AO data, especially in limiting cases of crowded fields and marginally resolved sources. We quantify the limitations of these tools with synthetic images, and present a proof-of-concept study showing the potential of using reconstructed PSFs from the (GL)AO system telemetry to increase the measured photometric accuracy. We show that the photometric accuracy is significantly improved with a good PSF reconstruction in considerably crowded regions. We demonstrate the need for a dedicated post-processing tool that incorporates available information about the PSF, as well as the ability to adjust to the spatial variations of the PSF characteristic of AO data.