QSO J1721+8842 spectra

High-redshift binary quasars provide key insights into mergers and quasar activity, and are useful tools for probing the spatial kinematics and chemistry of galaxies along the...高红移双类星体（High-redshift binary quasars）为星系并合与类星体活动提供了关键研究见解，同时亦是用于探测沿[原文未完整表述的范围]分布的星系的空间运动学与化学组成的实用工具。