Calibration of EFOSC2 Broadband Linear Imaging Polarimetry
Calibration of EFOSC2 Broadband Linear Imaging Polarimetry
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DOI：
10.1017/pasa.2018.6
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发表时间：
2018-02
影响因子：
6.3
通讯作者：
K. Wiersema;A. Higgins;S. Covino;R. Starling
中科院分区：
文献类型：
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作者：
K. Wiersema;A. Higgins;S. Covino;R. Starling
摘要欧洲南方天文台暗天体摄谱仪和照相机v2是欧洲南方天文台新技术望远镜的主力仪器之一，也是拉西拉天文台最受欢迎的仪器之一。它安装在一个Nasmyth焦点，因此表现出强大的，波长和指向方向相关的仪器偏振。在本文档中，我们描述了我们校准宽带成像偏振测量模式的努力，并提供了宽带B、V和R滤波器的校准，以满足大多数使用情况（即偏振校准不确定度约为0.1%）。我们公开了我们的校准代码。这项校准工作可用于提高欧洲南方天文台微弱物体摄谱仪和照相机v2未来偏振方案的产量，因为它可以用大大减少的标准星星观测数据进行良好的校准。同样，我们的校准模型可以与档案校准观测相结合，对过去几年拍摄的数据进行后处理，以形成具有巨大科学潜力的欧洲南方天文台微弱物体光谱仪和相机v2遗产档案。
Abstract The European Southern Observatory Faint Object Spectrograph and Camera v2 is one of the workhorse instruments on ESO’s New Technology Telescope, and is one of the most popular instruments at La Silla observatory. It is mounted at a Nasmyth focus, and therefore exhibits strong, wavelength and pointing-direction-dependent instrumental polarisation. In this document, we describe our efforts to calibrate the broadband imaging polarimetry mode, and provide a calibration for broadband B, V, and R filters to a level that satisfies most use cases (i.e. polarimetric calibration uncertainty ~0.1%). We make our calibration codes public. This calibration effort can be used to enhance the yield of future polarimetric programmes with the European Southern Observatory Faint Object Spectrograph and Camera v2, by allowing good calibration with a greatly reduced number of standard star observations. Similarly, our calibration model can be combined with archival calibration observations to post-process data taken in past years, to form the European Southern Observatory Faint Object Spectrograph and Camera v2 legacy archive with substantial scientific potential.