Spectral and Spatial Characterization and Calibration of FIFI-LS — The Field Imaging Spectrometer on SOFIA
Spectral and Spatial Characterization and Calibration of FIFI-LS — The Field Imaging Spectrometer on SOFIA
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FIFI-LS 的光谱和空间表征及校准 — SOFIA 上的场成像光谱仪
DOI：
10.1142/s2251171718400044
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发表时间：
2018
影响因子：
1.3
通讯作者：
W. Vacca
中科院分区：
文献类型：
--
作者：
S. Colditz;S. Beckmann;A. Bryant;C. Fischer;F. Fumi;N. Geis;M. Hamidouche;T. Henning;R. Hönle;C. Iserlohe;R. Klein;A. Krabbe;L. Looney;A. Poglitsch;W. Raab;F. Rebell;D. Rosenthal;M. Savage;M. Schweitzer;W. Vacca
场成像远红外谱仪（FIFI-LS）是平流层红外天文观测台（SOFIA）的一种科学仪器。FIFI-LS允许在两个光谱通道中同时观测。“蓝色”通道从51[公式：参见文本][公式：参见文本]m到125[公式：参见文本][公式：参见文本]m，“红色”通道从115[公式：参见文本][公式：参见文本]m到203[公式：参见文本][公式：参见文本]m。蓝色通道的瞬时光谱覆盖范围为1000-3000[公式：见文]km/s，红色通道为800-2500[公式：见文]km/s，光谱分辨率在150[公式：见文]~ 600[公式：见文]km/s之间。每个光谱通道观察天空中5 × 5空间像素的场。蓝色通道中的像素大小为6.14 × 6.25平方角秒，红色通道中的像素大小为12.2 × 12.5平方角秒。fii - ls自2014年以来一直在SOFIA运营。它是天文学界的一种科学仪器。我们提出了基于实验室测量的仪器的光谱和空间表征结果。这包括测量的光谱分辨率和谱域中的线扩展函数的例子。在空间域中，给出了仪器点扩散函数（PSF）的模型和二次回波的描述。我们还概述了用于测量仪器视场几何形状和光谱校准的程序。根据波长的不同，光谱校准的精度为15-60 km/s。
The field-imaging far-infrared line spectrometer (FIFI-LS) is a science instrument for the Stratospheric Observatory for Infrared Astronomy (SOFIA). FIFI-LS allows simultaneous observations in two spectral channels. The “blue” channel is sensitive from 51[Formula: see text][Formula: see text]m to 125[Formula: see text][Formula: see text]m and the “red” channel from 115[Formula: see text][Formula: see text]m to 203[Formula: see text][Formula: see text]m. The instantaneous spectral coverage is 1000–3000[Formula: see text]km/s in the blue and 800–2500[Formula: see text]km/s in the red channel with a spectral resolution between 150[Formula: see text]km/s and 600[Formula: see text]km/s. Each spectral channel observes a field of five by five spatial pixels on the sky. The pixel size in the blue channel is 6.14 by 6.25 square arc seconds and it is 12.2 by 12.5 square arc seconds in the red channel. FIFI-LS has been operating on SOFIA since 2014. It is available to the astronomical community as a facility science instrument. We present the results of the spectral and spatial characterization of the instrument based on laboratory measurements. This includes the measured spectral resolution and examples of the line spread function in the spectral domain. In the spatial domain, a model of the instrument’s point spread function (PSF) and the description of a second pass ghost are presented. We also provide an overview of the procedures used to measure the instrument’s field of view geometry and spectral calibration. The spectral calibration yields an accuracy of 15–60[Formula: see text]km/s depending on wavelength.