ESI: a new spectrograph for the Keck II telescope
ESI: a new spectrograph for the Keck II telescope
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ESI：凯克 II 望远镜的新型光谱仪
DOI：
10.1117/12.268998
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发表时间：
1997
期刊：
影响因子：
--
通讯作者：
B. Sutin
中科院分区：
文献类型：
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作者：
B. Sutin
ESI(回声光谱仪和成像仪)是一种多模式卡塞格伦光谱仪，目前由UCO/Lick天文台为Keck II望远镜资助和建造。ESI仪器有三种模式。170.0 mm的准直光束可以通过棱镜散射器直接送入相机成像，也可以通过棱镜交叉散射器送入带有棱镜交叉色散的栅格。所有三种模式都使用全折射EPPS相机和单个2K×4K探测器。直接成像模式的视场为2.0×8.0-arcmin，像素为0.15-arcsec。滤光片可以放置在望远镜焦面附近，也可以放置在平行光束中，未来还可以选择升级，包括在光瞳图像上安装法布里-珀罗透镜。根据波长的不同，低色散仅棱镜模式的色散为50至300公里/秒/像素，并且该模式可用于8.0弧长的狭缝或具有用户定制的狭缝掩模的多缝模式。高色散的单色散模式在一次曝光中提供了从0.39微米到1.09微米的整个光谱，狭缝长度为20.0角秒，色散为9.6到12.8公里/秒/像素。
The ESI (echellette spectrograph and imager) is a multi-mode Cassegrain spectrograph currently funded and under construction at UCO/Lick Observatory for the Keck II telescope. The ESI instrument has three modes. The 170.0-mm collimated beam can be sent directly into the camera for imaging, through a prism disperser, or to an echellette grating with prism cross-dispersion. An all-refracting Epps camera and a single 2 K by 4 K detector are used for all three modes. The direct-imaging mode has a 2.0 multiplied by 8.0- arcmin field of view with 0.15-arcsec pixels. Filters may be placed either near the focal surface of the telescope or in the parallel beam, and the option of a future upgrade including a Fabry-Perot at the pupil image is available. The low-dispersion prism-only mode has a dispersion of 50 to 300 km/sec/pix, depending on wavelength, and this mode can be used with a 8.0-arcmin long slit or in a multi-slit mode with user- made slit-masks. The high-dispersion echellette mode gives the entire spectrum from 0.39 to 1.09 microns with a 20.0-arcsec slit length in a single exposure, with a dispersion of 9.6 to 12.8 km/sec/pix.