Characterization and performance of the upgraded NIRSPEC on the W. M. Keck Telescope
Characterization and performance of the upgraded NIRSPEC on the W. M. Keck Telescope
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W. M. Keck 望远镜升级版 NIRSPEC 的特性和性能
DOI：
10.1117/12.2563075
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发表时间：
2020
期刊：
影响因子：
--
通讯作者：
McLean, Ian
中科院分区：
文献类型：
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作者：
Lopez, Ronald A.;Hoffman, Erika;Doppmann, Gregory;Fitzgerald, Michael P.;Johnson, Chris;Kassis, Marc;Lanclos, Kyle;Lyke, Jim;Martin, Emily C.;McLean, Ian
NIRSPEC是凯克II望远镜上的高分辨率近红外阶梯光栅光谱仪，于1999年投入使用，并于2018年升级。 最近的升级旨在提高灵敏度和寿命 通过更换光谱仪科学探测器（SPEC）和狭缝观察相机（SCAM）来提高仪器的性能。调试于2018年12月开始，产生了用于表征升级系统的第一张天空图像。通过使用测光和光谱的标准星和内部校准灯，我们评估的性能升级后的SPEC和SCAM探测器。首先，我们评估增益，读噪声，暗电流，和spec检测器的电荷持久性。然后，我们描述了新升级的光谱仪和由此产生的灵敏度的改进，包括光谱零点，像素尺度，和整个光谱仪检测器领域的分辨率。最后，对于SCAM，我们提出了零点，像素比例，并提供了相机的几何失真的地图。
NIRSPEC is a high-resolution near-infrared echelle spectrograph on the Keck II telescope that was commissioned in 1999 and upgraded in 2018. This recent upgrade was aimed at improving the sensitivity and longevity of the instrument through the replacement of the spectrometer science detector (SPEC) and slit-viewing camera (SCAM). Commissioning began in 2018 December, producing the first on-sky images used in the characterization of the upgraded system. Through the use of photometry and spectroscopy of standard stars and internal calibration lamps, we assess the performance of the upgraded SPEC and SCAM detectors. First, we evaluate the gain, readnoise, dark current, and the charge persistence of the spec detector. We then characterize the newly upgraded spectrometer and the resulting improvements in sensitivity, including spectroscopic zero points, pixel scale, and resolving power across the spectrometer detector field. Finally, for SCAM, we present zero points, pixel scale, and provide a map of the geometric distortion of the camera.