论文标题
Qubrics Bright类星体调查的光谱随访
The spectroscopic follow-up of the QUBRICS bright quasar survey
论文作者
论文摘要
我们介绍了Qubrics调查的光谱随访结果。选择方法基于一种适用于光度目录的机器学习方法，涵盖了南半球的$ \ sim $ 12,400度$^2 $。光谱观察结果始于2018年，并确定了55个新的，高红移（z> = 2.5），明亮（i <= 18）QSOS，目录于2019年底发布。在这里，我们报告了该调查的当前状态，将Z <= 2.5在224的Z <2.5确定为224的QSO总数。事实证明，主要的污染物是z <2.5的下Z QSO。这项调查提供了High-Z中明亮QSO的独特样本，可用于许多宇宙学研究。特别是，使用39m ELT的雇用光谱仪进行南半球的红移漂移测量值（Sandage测试）似乎是可能的，而在25年内的观测值少于2500小时。
We present the results of the spectroscopic follow up of the QUBRICS survey. The selection method is based on a machine learning approach applied to photometric catalogs, covering an area of $\sim$ 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) 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 particular, carrying out the redshift drift measurements (Sandage Test) in the Southern Hemisphere, using the HIRES spectrograph at the 39m ELT, appears to be possible with less than 2500 hours of observations spread over 30 targets in 25 years.
