The JWST FRESCO survey: legacy NIRCam/grism spectroscopy and imaging in the two GOODS fields
The JWST FRESCO survey: legacy NIRCam/grism spectroscopy and imaging in the two GOODS fields
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JWST FRESCO 调查：两个 GOODS 领域中的传统 NIRCam/grism 光谱和成像
DOI：
10.1093/mnras/stad2411
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发表时间：
2023
影响因子：
4.8
通讯作者：
Oesch P
中科院分区：
文献类型：
--
作者：
Oesch P
我们推出 JWST 周期 1 53.8 h 中等程序 FRESCO，是“第一再电离纪元光谱完整观测”的缩写。 FRESCO 覆盖了两个 GOODS/CANDELS 字段中的每一个 62 arcmin2，总面积为 124 arcmin2，利用了 JWST 在近红外波长下强大的新棱镜光谱功能。通过使用 F444W 滤光片获得~2 h 深的 NIRCam/grism 观测，FRESCO 在 R~1600 处产生了前所未有的光谱，覆盖 NIRCam 视场中大多数星系的 3.8–5.0 µm。该装置能够对大部分宇宙历史进行发射线测量，从强PAH线atz∼ 0.2–0.5，到Pa α和Pa β atz∼ 1–3，Heiand [Siii] atz∼ 2.5–4.5，H α和[Nii] atz∼ 5–6.5，一直到[Oiii]和H β forz∼ 7–9星系。 FRESCO 的棱镜观测提供了总线通量，用于准确估计星系恒星质量并校准同一视场中 NIRSpec/MSA 光谱的狭缝损失校正。此外，FRESCO 会在相同视场中产生 F182M、F210M 和 F444W 成像的马赛克，深度为 ∼28.2 mag（032 直径孔径中的 5σ）。在这里，我们描述了总体调查设计以及可以通过 FRESCO 实现的关键科学目标。我们还重点介绍了几项早期科学成果，包括：大约 20 年前发现的莱曼断裂星系的光谱红移、发现了 atz> 4 的宽线活动星系核，以及解析了 atz∼1.4 星系的 Pa α 图。这些结果证明了 NIRCam/grism 观测的偶然发现的巨大力量。
We present theJWSTcycle 1 53.8 h medium program FRESCO, short for ‘First Reionization Epoch Spectroscopically Complete Observations’. FRESCO covers 62 arcmin2in each of the two GOODS/CANDELS fields for a total area of 124 arcmin2exploitingJWST’s powerful new grism spectroscopic capabilities at near-infrared wavelengths. By obtaining ∼2 h deep NIRCam/grism observations with theF444Wfilter, FRESCO yields unprecedented spectra atR∼ 1600 covering 3.8–5.0 µm for most galaxies in the NIRCam field of view. This setup enables emission line measurements over most of cosmic history, from strong PAH lines atz∼ 0.2–0.5, to Pa α and Pa β atz∼ 1–3, Heiand [Siii] atz∼ 2.5–4.5, H α and [Nii] atz∼ 5–6.5, up to [Oiii] and H β forz∼ 7–9 galaxies. FRESCO’s grism observations provide total line fluxes for accurately estimating galaxy stellar masses and calibrating slit-loss corrections of NIRSpec/MSA spectra in the same field. Additionally, FRESCO results in a mosaic ofF182M, F210M, andF444Wimaging in the same fields to a depth of ∼28.2 mag (5σ in 032 diameter apertures). Here, we describe the overall survey design and the key science goals that can be addressed with FRESCO. We also highlight several, early science results, including: spectroscopic redshifts of Lyman break galaxies that were identified almost 20 yr ago, the discovery of broad-line active galactic nuclei atz> 4, and resolved Pa α maps of galaxies atz∼ 1.4. These results demonstrate the enormous power for serendipitous discovery of NIRCam/grism observations.