论文标题
在z = 2.91时，三个莱曼 - 阿尔法发出的细丝会融合到一个巨大的星系组：讨论冷气中心的情况
Three Lyman-alpha emitting filaments converging to a massive galaxy group at z=2.91: discussing the case for cold gas infall
论文作者
论文摘要
我们发现了一个300kpc范围的巨型Lya Nebula，以cosmos领域的Z = 2.91为中心，Z = 2.91。 Keck Cosmic Web成像仪的观察结果揭示了三个冷气丝丝集合到其〜4x10^13msun暗物质光环的潜在孔的中心，如Alma和Noema观测所探测的1200msun/yr恒星形成。星云的形态和运动学特性以及Lya光谱中蓝光成分的普遍性与气体积聚的情况一致。 AGN活性和整体能量的上限有利于重力作为主要的LYA动力来源，并作为系统的主要气流来源。尽管仍然存在解释性困难，但流出和随之而来的重组仍可能发挥作用，但这一发现可以说是一个理想的环境，用于定量测试在高红移的积极恒星大型光环内的冷气和银河系喂养的模型。
We have discovered a 300kpc-wide giant Lya nebula centered on the massive galaxy group RO-1001 at z=2.91 in the COSMOS field. Keck Cosmic Web Imager observations reveal three cold gas filaments converging into the center of the potential well of its ~4x10^13Msun dark matter halo, hosting 1200Msun/yr of star formation as probed by ALMA and NOEMA observations. The nebula morphological and kinematics properties and the prevalence of blueshifted components in the Lya spectra are consistent with a scenario of gas accretion. The upper limits on AGN activity and overall energetics favor gravity as the primary Lya powering source and infall as the main source of gas flows to the system. Although interpretational difficulties remain, with outflows and likely also photoionization with ensuing recombination still playing a role, this finding provides arguably an ideal environment to quantitatively test models of cold gas accretion and galaxy feeding inside an actively star-forming massive halo at high redshift.
