Evaluating the performance of the Keck Observatory adaptive optics systems on crowded field data using different adaptive optics configurations

Evaluating the performance of the Keck Observatory adaptive optics systems on crowded field data using different adaptive optics configurations
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使用不同的自适应光学配置评估凯克天文台自适应光学系统在拥挤的现场数据上的性能

DOI:
10.1117/12.2629035
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发表时间:
2022
期刊:
Adaptive Optics Systems VIII
影响因子:
--
通讯作者:
Lyke, Jim E.
Lyke, Jim E.
中科院分区:
--
文献类型:
--
作者:
Chu, Devin;Ning, Wenmeng;Do, Tuan;Ghez, Andrea;Wizinowich, Peter;Lu, Jessica;Gautam, Abhimat K.;Ciurlo, Anna;Terry, Sean;Lyke, Jim E.

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我们目前的凯克望远镜的自适应光学(AO)银河系中心成像和光谱观测的性能评估使用三种不同的AO设置:激光引导星星与红外(IR)倾斜校正,激光引导星星与可见倾斜校正,和红外自然引导星星与金字塔波前传感器。对银河系中心的观测可以利用一颗明亮的红外倾斜星星(K′ = 7.4等)进行校正,它比光学倾斜星星近10角秒。这颗红外星星的接近使得能够对上述AO配置进行比较。我们提出的性能指标,如半高宽(FWHM),斯特列尔比,光谱信噪比和它们的关系,大气看到条件。红外倾斜星星使成像数据的中值空间半高宽降低了31%,使光谱数据的中值空间半高宽降低了30%。成像数据的中值Strehl提高了24%。此外,红外星星消除了在成像和光谱数据中来自微分倾斜误差的视宁度依赖性。这项评估为正在进行的AO系统升级提供了重要的工作,例如凯克I望远镜上的凯克全天精密自适应光学(KAPA)升级,以及为超大望远镜开发新的AO系统。
We present evaluations of the Keck Telescope’s adaptive optics (AO) performance on Milky Way Galactic center imaging and spectroscopic observations using three different AO setups: laser guide star with infrared (IR) tip-tilt correction, laser guide star with visible tip-tilt correction, and infrared natural guide star with a pyramid wavefront sensor. Observations of the Galactic Center can utilize a bright IR tip-tilt star (K′ = 7.4 mag) for corrections, which is over 10 arcseconds closer than the optical tip-tilt star. The proximity of this IR star enables the comparison of the aforementioned AO configurations. We present performance metrics such as full-width-at-half-maximum (FWHM), Strehl ratio, and spectral signal to noise ratio and their relations to atmospheric seeing conditions. The IR tip-tilt star decreases the median spatial FWHM by 31% in imaging data and 30% in spectroscopy. Median Strehl for imaging data improves by 24%. Additionally, the IR star removes the seeing dependence from differential tip-tilt error in both imaging and spectroscopic data. This evaluation provides important work for ongoing upgrades to AO systems, such as the Keck All sky Precision Adaptive Optics (KAPA) upgrade on the Keck I Telescope, and the development of new AO systems for extremely large telescopes.
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