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arXiv 2006.08414astro-ph.IM
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用VLT干涉仪和GRAVITY进行自适应光学辅助银河系中心观测的红外波前探测:操作和结果

Infrared wavefront sensing for adaptive optics assisted Galactic Center observations with the VLT interferometer and GRAVITY: operation and results

Stefan Hippler, Wolfgang Brandner, Silvia Scheithauer, Martin Kulas, Johana Panduro, Peter Bizenberger, Henry Bonnet, Casey Deen, Françoise Delplancke-Ströbele,… 展开作者

Stefan Hippler, Wolfgang Brandner, Silvia Scheithauer, Martin Kulas, Johana Panduro, Peter Bizenberger, Henry Bonnet, Casey Deen, Françoise Delplancke-Ströbele, Frank Eisenhauer, Gert Finger, Zoltan Hubert, Johann Kolb, Eric Müller, Laurent Pallanca, Julien Woillez, Gérard Zins, GRAVITY Collaboration

摘要:

介绍了基于近红外波前传感的自适应光学(AO)系统CIAO的工作原理。Coudé红外自适应光学(CIAO)系统是甚大望远镜(VLT)干涉仪(VLTI)的核心辅助部件。它特别能够使用重力仪器对银河中心(GC)进行观测。重力是一个高度专业化的光束组合器,该设备将四个8米望远镜的光相干组合,并最终同时在6个基线上记录K波段的干涉测量值。CIAO补偿了由大气湍流引起的相位扰动,这是所有四个8米单位望远镜(UT)在观测期间经历的。四个CIAO单元中的每一个在其UT处产生几乎衍射极限的图像质量,这确保了所观察到的恒星物体的最大通量进入重力光束组合器的光纤。我们目前的CIAO性能数据在前3年的操作作为天气条件的函数。我们描述了CIAO是如何配置和使用重力观测的。此外,我们重点介绍了近红外敏感的Saphira探测器的突出特点,这是第一次在Paranal上使用,并展示了它如何作为波前传感器探测器工作。

英文摘要:

This article describes the operation of the near-infrared wavefront sensing based Adaptive Optics (AO) system CIAO. The Coudé Infrared Adaptive Optics (CIAO) system is a central auxiliary component of the Very Large Telescope (VLT) interferometer (VLTI). It enables in particular the observations of the Galactic Center (GC) using the GRAVITY instrument. GRAVITY is a highly specialized beam combiner, a device that coherently combines the light of the four 8-m telescopes and finally records interferometric measurements in the K-band on 6 baselines simultaneously. CIAO compensates for phase disturbances caused by atmospheric turbulence, which all four 8 m Unit Telescopes (UT) experience during observation. Each of the four CIAO units generates an almost diffraction-limited image quality at its UT, which ensures that maximum flux of the observed stellar object enters the fibers of the GRAVITY beam combiner. We present CIAO performance data obtained in the first 3 years of operation as a function of weather conditions. We describe how CIAO is configured and used for observations with GRAVITY. In addition, we focus on the outstanding features of the near-infrared sensitive Saphira detector, which is used for the first time on Paranal, and show how it works as a wavefront sensor detector.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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