自适应光学热红外观测的探测极限。I. 观测数据

IF 3.3 3区 物理与天体物理 Q2 ASTRONOMY & ASTROPHYSICS
J. R. Sauter, W. Brandner, J. Heidt, F. Cantalloube
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引用次数: 0

摘要

地基热红外观测在校正大气层和望远镜本身发出的主要热辐射背景方面面临巨大挑战。随着 40 米级 ELT 的即将问世,地面观测的灵敏度将达到前所未有的水平,这就强调了对更加复杂的背景校正策略的需求。本研究旨在调查热背景对地基观测的影响,并确定专用校正策略中可能存在的限制因素。我们对使用不同望远镜和观测模式获得的直接成像数据中热背景的时间和空间特征进行了评估。我们特别分析了使用 VLT/NACO 和 KECK/NIRC2 获取的三个不同的数据集。我们的分析表明,这些观测数据并不完全受光子射出噪声的限制,而是由于不同数据集的背景补偿不完善而造成了额外的灵敏度损失。我们确定了背景波动与自适应光学系统活动之间的相关性。我们假设,自适应光学镜的瞳孔调制会给背景带来高频率的空间和时间波动,如果不对其进行适当补偿,最终会限制探测极限。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Detection Limits of Thermal-infrared Observations with Adaptive Optics. I. Observational Data
Ground-based thermal infrared observations face substantial challenges in correcting the predominant background emitted as thermal radiation from the atmosphere and the telescope itself. With the upcoming 40 m class ELTs, unprecedented sensitivities from ground will be reached, underlining the need of even more sophisticated background correction strategies. This study aims to investigate the impact of thermal backgrounds on ground-based observations and identify possible limiting factors in dedicated correction strategies. We evaluate temporal and spatial characteristics of the thermal background in direct imaging data obtained with different telescopes and observation modes. In particular, three distinct data sets, acquired using VLT/NACO and KECK/NIRC2, are analyzed. Our analysis reveals that the observations are not fully photon shot noise limited, but exhibit additional sensitivity losses caused by imperfect background compensation in the different data sets. We identify correlations between background fluctuations and the activity of the adaptive optics system. We hypothesize that the pupil modulation of the adaptive optics mirrors introduces high frequency spatial and temporal fluctuations to the background, which could ultimately constrain the detection limit if they are not compensated adequately.
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来源期刊
Publications of the Astronomical Society of the Pacific
Publications of the Astronomical Society of the Pacific 地学天文-天文与天体物理
CiteScore
6.70
自引率
5.70%
发文量
103
审稿时长
4-8 weeks
期刊介绍: The Publications of the Astronomical Society of the Pacific (PASP), the technical journal of the Astronomical Society of the Pacific (ASP), has been published regularly since 1889, and is an integral part of the ASP''s mission to advance the science of astronomy and disseminate astronomical information. The journal provides an outlet for astronomical results of a scientific nature and serves to keep readers in touch with current astronomical research. It contains refereed research and instrumentation articles, invited and contributed reviews, tutorials, and dissertation summaries.
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