We present the results of the spectroscopic follow-up of the QUasars as BRIght beacons for Cosmology in the Southern Hemisphere (QUBRICS; Calderone et al. 2019) survey. The selection method is based on a machine-learning approach applied to photometric catalogs, covering an area of ∼12,400 deg 2 in the Southern Hemisphere. The spectroscopic observations started in 2018 and identified 55 new, high-redshift ( z ≥ 2.5), bright ( i ≤ 18) quasi-stellar objects (QSOs), with the catalog published in late 2019. Here we report the current status of the survey, bringing the total number of bright QSOs at z ≥ 2.5 identified by QUBRICS to 224. The success rate of the QUBRICS selection method, in its most recent training, is estimated to be 68%. The predominant contaminant turns out to be lower- z QSOs at z < 2.5. This survey provides a unique sample of bright QSOs at high z available for a number of cosmological investigations. In particul...

中文翻译：

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QUBRICS明亮类星体调查的光谱跟踪

我们介绍了QUasars作为南半球宇宙学的BRIght信标的光谱学随访结果（QUBRICS; Calderone et al.2019）调查。选择方法是基于应用于光度学目录的机器学习方法，该方法在南半球覆盖了约12,400 deg 2的区域。光谱观察始于2018年，确定了55个新的高红移（z≥2.5），明亮（i≤18）准星体（QSO），其目录于2019年底发布。在这里，我们报告当前的状态调查显示，QUBRICS确定的z≥2.5的明亮QSO总数达到224。在最近的培训中，QUBRICS选择方法的成功率估计为68％。在z <2.5时，主要污染物为较低的z QSO。这项调查提供了高z值的明亮QSO的独特样本，可用于许多宇宙学调查。特别是...