The Gemini High Resolution Optical Spectrograph (GHOST) is a fiber-fed spectrograph system on the Gemini South telescope that provides simultaneous wavelength coverage from 348 to 1061 nm, and is designed for optimal performance between 363 and 950 nm. It can observe up to two objects simultaneously in a 7.′5 diameter field of regard at R ≃ 56,000 or a single object at R ≃ 75,000. The spectral resolution modes are obtained by using integral field units to image slice a 1.″2 aperture by a factor of five in width using 19 fibers in the high resolution mode and by a factor of three in width using 7 fibers in the standard resolution mode. GHOST is equipped with hardware to allow for precision radial velocity measurements, expected to approach meters per second precision. Here, we describe the basic design and operational capabilities of GHOST, and proceed to derive and quantify the key aspects of its on-sky performance that are of most relevance to its science users.

中文翻译：

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Gemini 高分辨率光学光谱仪的科学性能

Gemini 高分辨率光学摄谱仪 (GHOST) 是 Gemini South 望远镜上的光纤馈电摄谱仪系统，可同时提供 348 至 1061 nm 的波长覆盖范围，并专为在 363 至 950 nm 之间实现最佳性能而设计。它可以在直径为 7.′5 的视场中同时观察最多两个物体右≃ 56,000 或单个对象右≃ 75,000。光谱分辨率模式是通过以下方式获得的：在高分辨率模式下使用积分场单元对 1."2 孔径进行成像切片，在高分辨率模式下使用 19 根光纤，宽度为五倍；在标准分辨率模式下，使用 7 根光纤，宽度为三倍模式。 GHOST 配备了能够进行精确径向速度测量的硬件，预计精度可达米每秒。在这里，我们描述了 GHOST 的基本设计和操作能力，并继续推导和量化与其科学用户最相关的空中性能的关键方面。