作为IGM宇宙学演化探测器的巨射电银河系，I.用SALT进行初步深度探测和低分辨率光谱学
Giant Radio Galaxies as a probe of the cosmological evolution of the IGM, I. Preliminary deep detections and low-resolution spectroscopy with the SALT
摘要：
回顾了IGM的宇宙学演化问题，强调了寻找远（z>0.5）波瓣能量密度低于10^{-14} J m^{-3}的巨射电星系（GRG）来解决这个问题的必要性。因此，我们采用SALT在南天半球进行这样的GRG搜索。在本文中，我们提出了一个选定的样本的GRG候选人和第一次深探测遥远的宿主星系，以及低分辨率光谱的星系上的DSS框架。在性能验证（P-V）阶段收集的数据表明，35个星系中有21个光谱红移的投影线性尺寸大于1 Mpc（对于H_{0} =71 km \s \Mpc）。然而，它们的红移值不超过0.4，其中只有两个的能量密度小于10^{-14} J m^{-3}。对其中一个星系（J1420-0545）的测光红移估计表明其线性范围大于4.8 Mpc，即比迄今已知的最大GRG 3C 236大。
英文摘要：
A problem of the cosmological evolution of the IGM is recalled and a necessity to find distant (z>0.5) giant radio galaxies (GRGs) with the lobe energy densities lower than about 10^{-14} J m^{-3} to solve this problem is emphasized. Therefore we undertake a search for such GRGs on the southern sky hemisphere using the SALT. In this paper we present a selected sample of the GRG candidates and the first deep detections of distant host galaxies, as well as the low-resolution spectra of the galaxies identified on the DSS frames. The data collected during the Performance Verification (P-V) phase show that 21 of 35 galaxies with the spectroscopic redshift have the projected linear size greater than 1 Mpc (for H_{0}=71 km\s\Mpc). However their redshifts do not exceed the value of 0.4 and the energy density in only two of them is less than 10^{-14} J m^{-3}. A photometric redshift estimate of one of them (J1420-0545) suggests a linear extent larger than 4.8 Mpc, i.e. a larger than that of 3C236, the largest GRG known up to now.
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。
