AI 中文总结
本研究结合多波段巡天数据，新证认14个z>4的极端高红移射电类星体，将同条件已知该类天体数量提升约65%，样本可用于研究早期宇宙极端系统演化。
AI 中文摘要
我们结合X射线（eROSITA全天巡天）、光学/近红外（DECam Local Volume Exploration）和射电（Rapid ASKAP Continuum Survey）巡天数据，展示高红移射电类星体的选择与证认工作。在构建包含68个新的高红移类星体候选体的样本后，我们对其中46个源开展后续光谱观测，确认39个源的红移z>3.5。对于z>4的射电类星体子集，本次研究新证认的14个源，使相同天区、相同流量限以上已知该类天体的数量增长了约65%。利用X射线与光学的相对强度，我们在样本中证认出耀变体，进而将z>4的X射线选耀变体总数与文献中此前提出的分数IC/CMB模型的预测结果进行比较。总体而言，即便考虑到光谱后续观测的不完备性以及耀变体分类标准带来的红移分布潜在偏差，我们仍发现两者吻合度较高。本文呈现的样本非常适合研究早期宇宙中最极端系统的演化，包括其相对论性喷流与吸积特性。
英文摘要
We present the selection and identification of high-z radio quasars from a combination of X-ray (eROSITA All-Sky Survey), optical/NIR (DECam Local Volume Exploration), and radio (Rapid ASKAP Continuum Survey) surveys. After building a sample of 68 new high-z quasar candidates, we performed follow-up spectroscopic observations on 46 sources, confirming 39 to have redshifts z>3.5. For the subset of radio quasars at z>4, the 14 new sources identified here represent an increase of $\sim$65% in the known population of objects above the same flux limits in the same area. Using X-ray-to-optical relative intensity, we identified blazars in our sample, which we then used to compare the total number of z>4, X-ray selected blazars to the predictions of a fractional IC/CMB model previously proposed in the literature. Overall we find a relatively good agreement, even considering the potential biases in the redshift distribution from the incompleteness of the spectroscopic follow-up and the blazar classification criteria. The sources presented in this work represent a sample well suited for investigating the evolution of the most extreme systems in the early Universe, including their relativistic jets and accretion properties
CommentsAccepted for pubblication on MNRAS 2026 August 04, Submitted 2026 May 25
