Abstract. The James Webb Space Telescope near-infrared camera (JWST NIRCam) has two 2.′2×2.′2 fields of view that can be observed with either imaging or spectroscopic modes. Either of two R∼1500 grisms with orthogonal dispersion directions can be used for slitless spectroscopy over λ=2.4 to 5.0 μm in each module, and shorter wavelength observations of the same fields can be obtained simultaneously. We describe the design drivers and parameters of the grisms and present the latest predicted spectroscopic sensitivities, saturation limits, resolving powers, and wavelength coverage values. Simultaneous short wavelength (0.6 to 2.3 μm) imaging observations of the 2.4 to 5.0 μm spectroscopic field can be performed in one of several different filter bands, either infocus or defocused via weak lenses internal to the NIRCam. The grisms are available for single-object time-series spectroscopy and wide-field multiobject slitless spectroscopy modes in the first cycle of JWST observations. We present and discuss operational considerations including subarray sizes and data volume limits. Potential scientific uses of the grisms are illustrated with simulated observations of deep extragalactic fields, dark clouds, and transiting exoplanets. Information needed to plan observations using these spectroscopic modes is also provided.

中文翻译：

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詹姆斯·韦伯太空望远镜NIRCam仪器的λ= 2.4至5μm光谱

抽象的。詹姆斯·韦伯太空望远镜近红外相机（JWST NIRCam）具有两个2.'2×2.'2视场，可以通过成像或光谱模式进行观察。在每个模块中，可以将两个具有正交色散方向的R〜1500光栅中的任一个用于λ= 2.4至5.0μm的无缝光谱，并且可以同时获得相同场的更短波长观测值。我们描述了磨粒的设计驱动因素和参数，并提供了最新的预测光谱灵敏度，饱和度极限，分辨能力和波长覆盖范围值。可以在几个不同的滤光带之一中进行同时对2.4到5.0μm光谱范围的短波长（0.6到2.3μm）成像观察，或者通过NIRCam内部的弱透镜进行散焦或散焦。在JWST观测的第一个周期中，可用于单对象时间序列光谱和宽场多对象无狭缝光谱模式。我们介绍并讨论操作注意事项，包括子阵列大小和数据量限制。通过对深银河外场，乌云和过渡系外行星的模拟观察，说明了对这种潜在的科学用途。还提供了使用这些光谱模式计划观察所需的信息。乌云和正在运行的系外行星。还提供了使用这些光谱模式计划观察所需的信息。乌云和正在运行的系外行星。还提供了使用这些光谱模式计划观察所需的信息。