论文标题
z = 10.3-13.2的四个金属贫困星系的光谱证实
Spectroscopic confirmation of four metal-poor galaxies at z=10.3-13.2
论文作者
论文摘要
发现和表征第一个在宇宙黎明中阐明早期宇宙的星系对于理解导致第一颗恒星形成的物理条件和过程至关重要。在操作的头几个月中，詹姆斯·韦伯（James Webb）太空望远镜（JWST）的成像已被用来识别大爆炸后不到4.5亿年的Redshift（Z）的数十种星系候选者。但是，这些候选人尚未通过光谱镜进行确认，这使他们实际上是低红移的闯入者的可能性。在这里，我们介绍了在红移10.3 <z <13.2上明确检测到的四个星系的光谱确认和分析，此前先前从Nircam成像中选择。光谱表明，这些原始星系是极低的，质量在10^7到几次10^8太阳能和年轻年龄之间。在此时期，靠近Lyman边缘的连续体的阻尼机翼与完全中性的层状培养基一致。这些发现表明了第一代星系在宇宙黎明中的迅速出现。
Finding and characterising the first galaxies that illuminated the early Universe at cosmic dawn is pivotal to understand the physical conditions and the processes that led to the formation of the first stars. In the first few months of operations, imaging from the James Webb Space Telescope (JWST) have been used to identify tens of candidates of galaxies at redshift (z) greater than 10, less than 450 million years after the Big Bang. However, none of these candidates has yet been confirmed spectroscopically, leaving open the possibility that they are actually low-redshift interlopers. Here we present spectroscopic confirmation and analysis of four galaxies unambiguously detected at redshift 10.3<z<13.2, previously selected from NIRCam imaging. The spectra reveal that these primeval galaxies are extremely metal poor, have masses between 10^7 and a few times 10^8 solar masses, and young ages. The damping wings that shape the continuum close to the Lyman edge are consistent with a fully neutral intergalactic medium at this epoch. These findings demonstrate the rapid emergence of the first generations of galaxies at cosmic dawn.
