标题： JWST/NIRISS宽场无狭缝光谱学的全球天空背景图像 显示英文标题

标题： Global sky background images for JWST/NIRISS Wide-Field Slitless Spectroscopy

摘要： 我们为JWST/NIRISS宽视场无狭缝光谱 (WFSS) 提供更新的实测背景图像，适用于所有正交光栅（GR150C, GR150R）与所有NIRISS WFSS宽波段滤光片（F090W, F115W, F150W, F200W）的组合。 这些背景图像使用经过仔细验证的科学和校准曝光创建，提高了之前背景参考文件的质量。 我们介绍了创建背景图像的方法，并使用减去背景的科学数据来评估其质量。 总体而言，所有滤光片和光栅组合的背景残差低于天空亮度的1%，相当于背景均方根值比之前的背景参考文件降低了多达7倍。 新的背景图像自上下文1365起可在校准参考数据系统（CRDS）上获取，我们建议使用它们以提高NIRISS WFSS数据的质量。 显示英文摘要

摘要： We present updated empirical background images for JWST/NIRISS Wide-Field Slitless Spectroscopy (WFSS) for both orthogonal grisms (GR150C, GR150R) crossed with all NIRISS WFSS wide-band filters (F090W, F115W, F150W, F200W). The background images are created using carefully vetted science and calibration exposures and improve the quality of previous background reference files. We present our methodology to create the background images and assess their quality using background subtracted science data. Overall, background residuals reach below 1% of the sky brightness for all filter and grism combinations, corresponding to a decrease in the background RMS of a factor of up to 7 from previous background reference files. The new background images are available on the Calibration Reference Data System (CRDS) as of context 1365 and we recommend using them for improved quality of NIRISS WFSS data.