构建宇宙黎明时期的射电类星体样本——射电高红移类星体目录（RHzQCat）：I. 从SDSS类星体和射电巡天中构建的目录
Building a Radio AGN Sample from Cosmic Morning -- The Radio High-Redshift Quasar Catalog (RHzQCat): I. Catalog from SDSS Quasars and Radio Surveys at $z > 3$
AI总结：
本研究通过交叉匹配SDSS目录与四个射电巡天，构建了包含1629个可靠和315个候选射电明亮高红移类星体的目录，填补了宇宙黎明时期AGN活动的观测空白。
摘要：
射电明亮的高红移类星体（RHRQs）为研究相对论喷流的演化及其与超大质量黑洞增长的联系提供了关键见解。在已广泛研究的$z \ge 5$群体之外，宇宙黎明时期（$3 \lesssim z \lesssim 5$）标志着活动星系核（AGN）活动和黑洞吸积的高峰，但仍未被充分探索。在本工作中，我们通过将SDSS DR16Q目录与四个主要射电巡天（FIRST、NVSS、RACS和GLEAM）进行交叉匹配，构建了射电高红移类星体目录（RHzQCat）。我们的分层交叉匹配框架和视觉验证确保了在具有不同束宽的巡天中可靠地识别源。该目录包括1629个可靠和315个候选RHRQs，其射电亮度均匀覆盖$10^{25.5}$ -- $10^{29.3}$ W Hz$^{-1}$。大约95%的确认源表现出紧凑形态，与高红移处的多普勒增强或年轻AGN群体一致。我们的目录将已知的$z\ge3$ RHRQs数量增加了十倍，代表了目前最大的、最均匀的射电类星体目录，填补了早期（$z>6$）和本地宇宙之间的观测空白。它为未来利用下一代设施如平方千米阵列（SKA）进行喷流演化、AGN反馈和宇宙磁性统计研究提供了稳健的参考。
英文摘要：
Radio-loud high-redshift quasars (RHRQs) provide crucial insights into the evolution of relativistic jets and their connection to the growth of supermassive black holes. Beyond the extensively studied population at $z \ge 5$, the cosmic morning epoch ($3 \lesssim z \lesssim 5$) marks the peak of active galactic nucleus (AGN) activity and black hole accretion, yet remains relatively unexplored. In this work, we compiled the radio high-redshift quasar catalog (RHzQCat) by cross-matching the SDSS DR16Q catalog with four major radio surveys -- FIRST,NVSS, RACS, and GLEAM. Our tier-based cross-matching framework and visual validation ensured reliable source identification across surveys with diverse beam sizes. The catalog included 1629 reliable and 315 candidate RHRQs, with radio luminosities uniformly spanning $10^{25.5}$ -- $10^{29.3}$ W Hz$^{-1}$. About 95\% of the confirmed sources exhibited compact morphologies, consistent with Doppler-boosted or young AGN populations at high redshifts. Our catalog increases the number of known RHRQs at $z\ge3$ by an order of magnitude, representing the largest and most homogeneous catalog of radio quasars at cosmic morning, filling the observational gap between the early ($z>6$) and local Universe. It provides a robust reference for future statistical studies of jet evolution, AGN feedback, and cosmic magnetism with next-generation facilities such as the Square Kilometer Array (SKA).
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
