Detection of Pristine Gas Two Billion Years After the Big Bang
Detection of Pristine Gas Two Billion Years After the Big Bang
复制标题
大爆炸二十亿年后探测到原始气体
作者：
M. Fumagalli;J. O’Meara;J. Prochaska
已经观察到两个宇宙云，其组成接近于第一批恒星形成之前的宇宙。在目前的宇宙学模型中，只有三种最轻的元素是在大爆炸后的最初几分钟内产生的;所有其他元素都是在恒星中产生的。然而，迄今为止，在所有天体物理环境中都观测到了重元素。我们报告检测到两个气体云，没有明显的元素比氢重。这些系统在早期宇宙中表现出最低的重元素丰度，因此是大多数贫金属晕星的潜在燃料。在一个系统中检测到原始核合成所预测的水平的氘，提供了标准宇宙学模型的直接确认。这些云的组成进一步暗示了重元素从星系到其周围环境的传输是高度不均匀的。
Two cosmic clouds have been observed with a composition close to that of the universe before the first stars were formed. In the current cosmological model, only the three lightest elements were created in the first few minutes after the Big Bang; all other elements were produced later in stars. To date, however, heavy elements have been observed in all astrophysical environments. We report the detection of two gas clouds with no discernible elements heavier than hydrogen. These systems exhibit the lowest heavy-element abundance in the early universe, and thus are potential fuel for the most metal-poor halo stars. The detection of deuterium in one system at the level predicted by primordial nucleosynthesis provides a direct confirmation of the standard cosmological model. The composition of these clouds further implies that the transport of heavy elements from galaxies to their surroundings is highly inhomogeneous.
影响因子：
8.7
作者：
Komatsu, E.;Smith, K. M.;Wright, E. L.
通讯作者：
Wright, E. L.