Minnesota Institute for Astrophysics, University of Minnesota, Minneapolis, MN 55455, USA.
Cosmic Dawn Center, Niels Bohr Institute, University of Copenhagen, DK-2200 Copenhagen, Denmark.
Science. 2023 Apr 28;380(6643):416-420. doi: 10.1126/science.adf5307. Epub 2023 Apr 13.
Ultraviolet light from early galaxies is thought to have ionized gas in the intergalactic medium. However, there are few observational constraints on this epoch because of the faintness of those galaxies and the redshift of their optical light into the infrared. We report the observation, in JWST imaging, of a distant galaxy that is magnified by gravitational lensing. JWST spectroscopy of the galaxy, at rest-frame optical wavelengths, detects strong nebular emission lines that are attributable to oxygen and hydrogen. The measured redshift is = 9.51 ± 0.01, corresponding to 510 million years after the Big Bang. The galaxy has a radius of [Formula: see text] parsecs, which is substantially more compact than galaxies with equivalent luminosity at ~ 6 to 8, leading to a high star formation rate surface density.
早期星系的紫外光被认为会使星系际介质中的气体离子化。然而，由于这些星系的微弱性以及它们的光学光红移到红外线，对这个时期的观测约束很少。我们报告了在 JWST 成像中对一个遥远星系的观测结果，该星系受到引力透镜的放大。对星系的 JWST 光谱学在静止的光学波长上检测到强烈的星云发射线，这些发射线归因于氧和氢。测量的红移值为 = 9.51 ± 0.01，对应于大爆炸后 5.1 亿年。该星系的半径为 [Formula: see text] 秒差距，比等效亮度为 ~ 6 到 8 的星系更为紧凑，导致高的恒星形成率表面密度。
