Modeling the spatial PSF at the VLT focal plane for MUSE WFM data analysis purpose
Modeling the spatial PSF at the VLT focal plane for MUSE WFM data analysis purpose
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DOI：
10.1117/12.857277
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发表时间：
2010-07
影响因子：
10.6
通讯作者：
D. Serre;Emma Villeneuve;H. Carfantan;L. Jolissaint;V. Mazet;S. Bourguignon;A. Jarno
中科院分区：
文献类型：
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作者：
D. Serre;Emma Villeneuve;H. Carfantan;L. Jolissaint;V. Mazet;S. Bourguignon;A. Jarno
MUSE是多单元光谱探测器，是一台用于可见光和近红外波长的声光辅助积分场光谱仪，计划于2012.1年在甚大望远镜的UT4上投入使用。我们介绍了UT焦点的空间PSF的模拟及其视场和光谱变化的现状。对这些变化进行建模并研究它们的含义是研究MUSE数据分析和处理问题的基石，如MUSE数据立方体的融合、源提取和反卷积。在宽视场模式(WFM，1平方角-分钟视场，0.2角秒空间采样)下，MUSE可以在没有自适应光学(AO)校正的情况下运行，也可以使用旨在提供大视场范围内几乎均匀校正的接地层自适应光学设施来运行。在窄场模式下(7.5平方角秒FOV，0.025角秒空间采样)MUSE将使用激光断层扫描自适应光学重建，这意味着更强的空间变化。利用自适应光学模拟工具Paola，在WFM中模拟了大气湍流参数、观测波长、声光模和视场位置对空间PSF的影响。然后，我们开发了一个数学模型来拟合生成的数据，该模型允许在使用少量参数的情况下，近似MUSE DataCube的任何空间和光谱位置的PSF。最后，我们评估了直接从(未来)缪斯数据本身估计模型参数的可能性。
MUSE is the Multi Unit Spectroscopic Explorer, an AO-assisted integral field spectrograph for visible and near-IR wavelengths which is planned to be commissioned at the UT4 of the Very Large Telescope in 2012.1 We present the status on the modeling of the spatial PSF at the UT focus and its Field-of-View (FoV) and spectral variations. Modeling these variations and studying their implications is a cornerstone for some MUSE data analysis and processing problems such as fusion, source extraction and deconvolution of MUSE datacubes. In Wide Field Mode (WFM, 1 square arc-minute FoV, 0.2 arcsec spatial sampling), MUSE can operate without Adaptive Optics (AO) correction or with a Ground Layer Adaptive Optics facility aimed at providing an almost uniform correction over a large field of view. In Narrow Field Mode (7.5 square arcseconds FoV, 0.025 arcsec spatial sampling) MUSE will make use of a Laser Tomography Adaptive Optics reconstruction, implying stronger spatial variations. By using the adaptive optics simulation tool PAOLA, we simulate in WFM the spatial PSF as a function of atmospheric turbulence parameters, observed wavelengths, AO mode and position in the field of view. We then develop a mathematical model fitting the generated data which allows, with a small number of parameters, to approximate the PSF at any spatial and spectral position of MUSE datacube. Finally, we evaluate the possibility to estimate the model parameters directly from the (future) MUSE data themselves.