UCLA Adaptive Optics for Extremely Large Telescopes 4 – Conference Proceedings with at Gemini and at ELTs
UCLA Adaptive Optics for Extremely Large Telescopes 4 – Conference Proceedings with at Gemini and at ELTs
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加州大学洛杉矶分校用于超大望远镜的自适应光学器件 4 – Gemini 和 ELT 的会议论文集
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发表时间：
2016
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通讯作者：
Tony Sohn
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作者：
Tobias K. Fritz;N. Kallivayalil;Eleazar R. Carrasco;Benoit Neichel;Richard Davies;R. Beaton;Dylan Angell;Sean T. Linden;P. Zivick;Steve Majewski;Guillermo;Damke;Mike Boylan;Tony Sohn
本文首次利用自适应光学技术分析了绝对天文测量相对于背景星系的天文测量误差预算。我们使用双子座南卫星的GeMS/GSAOI获得的多共轭自适应光学（MCAO）图像进行分析。我们发现，使用昏暗的背景星系，可以在一个随机场中获得0.3 mas的参考精度。系统误差在该水平以下是可修正的，因此总体误差约为0.4 mas。由于参考源的扩展，我们发现有必要纠正PSF质心对所用孔径大小的依赖性，否则会导致重要的偏差。这种效应也需要考虑到超大型望远镜（elt）。当这种效应得到修正时，elt有可能在5年的基线上以10公里/秒的精度测量M31周围矮星系的正常运动。
Astrometry MCAO ABSTRACT We present in this study a first analysis of the astrometric error budget of absolute astrometry relative to background galaxies using adaptive optics. We use for this analysis multi-conjugated adaptive optics (MCAO) images obtained with GeMS/GSAOI at Gemini South. We find that it is possible to obtain 0.3 mas reference precision in a random field with 1 hour on source using faint background galaxies. Systematic errors are correctable below that level, such that the overall error is approximately 0.4 mas. Because the reference sources are extended, we find it necessary to correct for the dependency of the PSF centroid on the used aperture size, which would otherwise cause an important bias. This effect needs also to be considered for Extremely Large Telescopes (ELTs). When this effect is corrected, ELTs have the potential to measure proper motions of dwarfs galaxies around M31 with 10 km/s accuracy over a baseline of 5 years.