寻找高红移射电星系 II：发现已知最强射电星系 z=4.946
The quest for high-redshift radio galaxies II. Discovery of the most powerful known radio galaxy at z=4.946
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中文总结 AI 辅助
通过光学光谱确认了一个莱曼断裂技术选出的高红移射电星系候选体，红移为4.946，其射电光度达6.2e29 W/Hz，成为已知最强射电星系。
中文摘要 AI 辅助
作为我们寻找高红移射电星系（HzRGs）计划的一部分，我们展示了光学光谱观测所获得的结果，这些结果确认了一个利用莱曼断裂技术选出的高红移射电星系候选体。与射电源 TXS 2354+015 相关的光学辐射在 r 波段表现出显著的下降，这是 z~5 天体的特征。光学光谱显示出一条明亮的不对称发射线，其等效宽度约为 900 埃。通过探测到 NVλ1640 发射线，确认该发射线为莱曼α线，从而得出红移估计值 z=4.946。其宽带射电频谱可以用斜率为 0.94 的幂律很好地拟合。在静止系频率 500 MHz 处的射电光度为 6.2e29 W/Hz。这一结果使得该源成为目前已知的最强射电星系。
英文摘要
As part of our quest for high-redshift radio galaxies (HzRGs), we present the results obtained from optical spectroscopy leading to the confirmation of one HzRG candidate selected using the Lyman break technique. The optical emission, associated with the radio source TXS 2354+015, exhibits a prominent drop in the r band, which is characteristic of sources at z~5. The optical spectrum shows a bright asymmetric emission line, with a large equivalent width of ~900 Angstrom. Its identification with the Ly$α$ line is confirmed by the detection of the NV$λ$1640, leading to a redshift estimate of z=4.946. Its broadband radio spectrum is well reproduced using a power law with a slope of 0.94. The radio luminosity at the rest frame frequency of 500 MHz is 6.2e29 W/Hz. This result makes this source the most powerful radio galaxy currently known.
发表机构
- INAF - Osservatorio Astrofisico di Torino（意大利国家天体物理研究所都灵天文台）
- Space Telescope Science Institute for the European Space Agency (ESA), ESA Office（欧洲航天局空间望远镜科学研究所）
- Department of Physics & Astronomy, Johns Hopkins University（约翰斯·霍普金斯大学物理与天文学系）
- Dipartimento di Fisica, Università degli Studi di Torino（都灵大学物理系）
- European Southern Observatory（欧洲南方天文台）
机构由 AI 辅助整理，请以论文原文为准。
