MOCSS：用于JWST/NIRSpec无缝光谱的多目标日冕仪技术
MOCSS: Multi-Object Coronagraphy for JWST/NIRSpec Slitless Spectroscopy
- University of Minnesota（明尼苏达大学）
- Stockholm University（斯德哥尔摩大学）
- Space Telescope Science Institute（太空望远镜科学研究所）
- University of Texas at Austin（德克萨斯大学奥斯汀分校）
- University of Modena & Reggio Emilia（摩德纳与雷焦艾米利亚大学）
- University College London（伦敦大学学院）
- Williams College（威廉姆斯学院）
机构由 AI 辅助整理，请以论文原文为准。
AI总结：
本文提出MOCSS技术，通过同时打开NIRSpec微快门并关闭亮源快门，实现无需预选目标的高分辨率无缝光谱观测，在哈勃超深场发现22个多线发射源，并证明其可覆盖1-2微米全波段，具有强大发现潜力。
AI中文摘要：
我们提出了一种实验性的JWST/NIRSpec观测方法，以获得$R\gtrsim1000$的G140M/F100LP无缝光谱观测。这种“无缝光谱多目标日冕仪”（MOCSS）技术涉及同时打开NIRSpec上几乎所有微快门，同时关闭与天空中已知明亮天体对应的快门。通过对哈勃超深场的观测，我们展示了这些深场、高分辨率观测无需预先选择目标即可发现潜在目标。我们获得了22个可靠的多线发射源星表，红移范围$1.3<z<4.6$，观测到[OII]、[OIII]、H$\alpha$、H$\beta$和[NII]谱线，这些谱线约占在色散图像中直接识别出的发射线的$\sim80\\%$。MOCSS巡天为其中18个源提供了首次光谱红移。我们还证明，NIRSpec/G140M/F100LP观测模式的一阶光谱迹线显著延伸超过标称的$\sim1.89\rm \mu m$红端截止，在最极端情况下可达$2.94\rm \mu m$。与曝光时间相似的现有NIRISS WFSS相比，我们发现MOCSS技术可以观测非常暗弱的谱线，同时覆盖完整的$1-2 \rm \mu m$波段，且波长覆盖无间隙。这项研究描述了$1-2 \rm \mu m$波段最高分辨率无缝光谱巡天，并强调了这种非传统观测技术的发现潜力。
英文摘要：
We present an experimental JWST/NIRSpec observational method to obtain $R\gtrsim1000$ G140M/F100LP slitless spectroscopic observations. This "Multi-Object Coronagraphy for Slitless Spectroscopy" (MOCSS) technique involves opening essentially all microshutters on NIRSpec simultaneously while closing shutters corresponding on-sky with known bright objects. Through observations of the Hubble Ultra Deep Field, we demonstrate the discovery potential of these deep, high resolution observations without the need for target pre-selection. We obtain a catalog of 22 secure multi-line emitters at $1.3<z<4.6$, with observations of [OII], [OIII], H$α$, H$β$ and [NII] lines, accounting for $\sim80\%$ of the emission lines identified directly in the dispersed images. The MOCSS survey provides first time spectroscopic redshifts for 18 of these sources. We also demonstrate that first order traces of the NIRSpec/G140M/F100LP observing mode extend substantially beyond the nominal $\sim1.89\rm μm$ red cutoff, as far as $2.94\rm μm$ in the most extreme case. Compared to existing NIRISS WFSS of similar exposure times, we find that the MOCSS technique can observe very faint lines while covering the full $1-2 \rm μm$ regime without gaps in wavelength coverage. This study describes the highest-resolution slitless spectroscopy campaign of the $1-2 \rm μm$ regime and emphasizes the discovery potential of this unorthodox observational technique.
