AI 中文总结
研究 HETDEX 春季场中 15 个巨型射电类星体，通过分析射电形态和光谱并拟合动力学模型研究其物理参数，与其他射电源比较，发现 GRQ 介质密度低，喷流功率与叶瓣年龄等反相关，且$t_l$是$Q_{\text{j}}$更强指标，还证明了它们之间的基本关系。
AI 中文摘要
巨型射电源被定义为宿主星系或类星体的河外射电源，线性尺寸≥0.7 兆秒差距。它们被认为代表了射电星系演化的最后阶段，其尺寸范围从 pc 到 Mpc 尺度。我们详细分析了 HETDEX 春季场中 15 个巨型射电类星体（GRQ）在 54MHz 至 4.85/15.5GHz 之间的射电形态和光谱，并将动力学演化模型拟合到源的观测特性上，以研究其物理参数（叶瓣年龄、喷流功率、环境介质密度等）。我们将 GRQ 的物理参数与已发表的 Fanaroff-Riley II 型射电源汇编样本的结果进行比较。我们发现，与具有相似喷流功率的较小尺寸射电类星体（RQ）相比，GRQ 在中心核心半径和叶瓣前方的介质密度显著更低。然而，这两个群体的推导中心核心密度对假定的环境介质密度剖面高度敏感。对于这两个群体的组合，喷流功率$Q_{\text{j}}$与叶瓣年龄$t_l$（$R = -0.67$，其中$R$是皮尔逊相关系数）以及线性尺寸$D_l$（$R=-0.32$）呈反相关，但$t_l$比$D_l$是$Q_{\text{j}}$的更强指标。使用斯皮尔曼偏秩相关分析，我们证明了尽管年龄和尺寸之间存在很强的潜在相关性，但$Q_{\text{j}}$、$t_l$和$D_l$之间存在基本关系。
英文摘要
Giant radio sources are defined as extragalactic radio sources, hosted by galaxies or quasars, with linear sizes $\geq 0.7$ Mpc. They are thought to represent the final stage of the evolution of radio galaxies whose sizes range from pc to Mpc scales. We analyse in detail the radio morphology and spectra between 54 MHz and 4.85/15.5 GHz of 15 giant radio quasars (GRQs) in the HETDEX Spring Field, and fit dynamical evolution models to the sources' observational properties to study their physical parameters (age of the lobes, jet power, ambient medium density etc.). We compare the physical parameters of the GRQs with published results for a compiled sample of Fanaroff-Riley type II radio sources. We find that the GRQs evolve in significantly lower medium densities, both at the central core radius and in front of the lobes, than smaller-sized radio quasars (RQs) with similar jet powers. The derived central core densities for both populations are, however, highly sensitive to the assumed ambient medium density profile. For both populations combined, the jet power, $Q_{\text{j}}$, is anti-correlated with the age of the lobes, $t_l$ ($R = -0.67$, where $R$ is the Pearson correlation coefficient), as well as the linear size, $D_l$ ($R=-0.32$), but $t_l$ is a much stronger indicator of $Q_{\text{j}}$ than $D_l$. Using a Spearman partial rank correlation analysis, we demonstrate that there is a fundamental relation between $Q_{\text{j}}$, $t_l$, and $D_l$, despite the strong underlying correlation between age and size.
CommentsAccepted for publication in MNRAS
