HI cosmological mass density at z=5

We present the largest homogeneous survey of z>4.4 damped Ly{alpha} systems (DLAs) using the spectra of 163 QSOs that comprise the Giant Gemini GMOS (GGG) survey. With this...我们利用构成双子GMOS巨型巡天（GGG）的163颗类星体（Quasi-Stellar Object，QSO）的光谱数据，开展了针对红移z＞4.4的阻尼莱曼α系统（damped Lyα systems，DLAs）的迄今规模最大的均匀巡天研究。依托此项工作，……