发表机构
Osservatorio di Astrofisica e Scienza dello Spazio di Bologna, INAF（博洛尼亚天文物理与空间科学观测站，意大利国家天体物理研究所）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
本文探讨JWST与未来ELT等极大望远镜在高红移星系研究中的进展，ELT衍射极限分辨率将比JWST高约6倍，结合引力透镜可分辨小于25秒差距的星团尺度，开启更精细的早期宇宙观测。
AI 中文摘要
詹姆斯·韦布空间望远镜（JWST）正在变革对早期宇宙的探索，它在红外波段提供了前所未有的角分辨率，并打开了K波段（2微米）以红一侧的独特窗口。得益于NIRCam、NIRISS、NIRSpec和MIRI仪器，它们以极高的效率提供成像和光谱观测，在运行的最初几年内便涌现出新的天体类别。宇宙时间的前5亿年现在已被常规探测，揭示了巨大的蓝色/红色星系，以及一类表现为“小红点”的活动星系核（AGN）种群，同时提供了再电离及再电离后时期源的红移系近红外/光学视图。角分辨率在2030年代至2040年代仍将至关重要，届时，极端自适应光学（AO）设施将部署在（8-10）米级望远镜（如VLT多共轭自适应光学（MCAO）辅助可见光成像仪和光谱仪，MAVIS）以及极大望远镜上，如39米ELT（例如，用于ELT观测的多共轭自适应光学中继，MORFEO）。这些设施在衍射极限下运行，将提高JWST的分辨率，其中ELT的点扩散函数（PSF）将缩小约6倍。在近红外波段，ELT的衍射极限PSF（半高全宽，FWHM约8-12毫角秒）将能在任何红移（z约<18）下分辨小于100秒差距的空间尺度，并以足够的灵敏度揭示丰富的恒星形成团块。利用引力透镜作为宇宙望远镜，即使放大倍数适中（μ约4-8），衍射极限的8米和39米望远镜也能探测约小于25秒差距的物理尺度，从而能够系统研究宇宙学距离上直至星团尺度的恒星形成。此类观测预计将在2030年代至2040年代成为常规。
英文摘要
The exploration of the early Universe is being transformed by the James Webb Space Telescope (JWST), which delivers unprecedented angular resolution at infrared wavelengths and opens a unique window redward of the K band (2um). Thanks to NIRCam, NIRISS, NIRSpec, and MIRI instruments, which provide both imaging and spectroscopy with exquisite efficiency, new classes of sources have emerged within the first years of operations. The first half-Gyr of cosmic time is now routinely probed, revealing massive blue/red galaxies and a population of Active Galactic Nuclei (AGN) appearing as "little red dots" together with a rest-frame near-infrared/optical view of sources across the reionization and post-reionization epochs. Angular resolution will remain pivotal in the 2030s - 2040s, when extreme adaptive optics (AO) facilities will be deployed on both (8 - 10)m (e.g., the VLT Multi-Conjugate-Adaptive-Optics (MCAO) - Assisted Visible Imager and Spectrograph, MAVIS) and on extremely large telescopes, like the 39m ELT (e.g., Multi-conjugate adaptive Optics Relay For ELT Observation, MORFEO). Operating at the diffraction limit, these facilities will improve JWST's resolution, with ELT achieving a factor of ~ 6 smaller Point-Spread-Function (PSF). An ELT diffraction-limited PSF (with a Full Width Half Maximum, FWHM ~ 8-12 mas) in the near infrared will resolve spatial scales <100 pc at any redshift (z ~< 18), revealing abundant star-forming clumps with sufficient sensitivity. Leveraging gravitational lensing as a cosmic telescope, even with moderate magnification factors (mu ~ 4-8), diffraction-limited 8m and 39m telescopes will probe physical scales ~< 25 pc, enabling systematic studies of star formation down to star-cluster scale at cosmological distances. Such observations are poised to become routine in the 2030s - 2040s.
CommentsPublished in EPJ Plus (the European Physical Journal Plus) on August 28th. A few typos fixed in this version
