AGN 喷流宿主星系 II：从半解析模型和 LoTSS 样本中获取基本信息
AGN hosting jets. II: Deriving fundamental information from semi-analytical models and the LoTSS sample
- Universitat de València（瓦伦西亚大学）
- INAF-Osservatorio di Astrofisica e Scienza dello Spazio di Bologna（意大利国家天体物理研究所博洛尼亚天文与空间科学观测站）
机构由 AI 辅助整理，请以论文原文为准。
AI总结：
本研究利用半解析模型模拟射电活跃星系，并与LoTSS观测样本对比，验证模型再现光度与大小分布的能力，发现喷流质量负载和活动期是关键参数，并预测LoTSS领域需至少3-4×10^5个射电星系。
AI中文摘要：
星系活动已被证明在宇宙历史中星团和星系演化中扮演着基本角色。在过去的几十年里，许多工作致力于确定射电光度函数及其演化，旨在理解和量化这一作用。在这项工作中，我们提出了一种不同的方法，基于应用半解析模型来生成多个数量级功率范围内的射电活跃星系的模拟样本，并与观测样本进行比较。本工作的目的是测试我们的半解析模型再现来自 LoTSS 巡天的射电活跃星系核样本中大量源的光度和大小分布的能力。我们应用我们的射电星系演化半解析模型，通过对每个源在概率分布内随机选择参数，生成数十万个源。我们的结果表明，该模型能够再现观测样本的主要特征，并确定模型中包含的喷流质量负载和活动期是未来工作中需要更详细研究的关键参数。这些初步结果使我们能够建立最大活动期范围从 10 到 200 Myr，活动时间分布概率 p(t_max) ∝ 1/t_max。我们还再现了 z<0.6 群体的射电光度函数，以及从 10^34.5 W 到 10^38 W 的喷流功率谱。我们的结果表明，质量负载是决定射电源光度随距离变化的基本参数，主要是在低功率范围内。我们的模型预测，在 LoTSS 领域中必须存在至少 3-4 × 10^5 个射电星系，才能获得观测到的 17045 个。这一群体主要由低功率源主导。
英文摘要：
Galactic activity has been shown to play a fundamental role in galaxy and cluster evolution throughout the history of the Universe. In the last decades, a number of works have tackled the determination of radio luminosity functions and their evolution, with the aim to understand and quantify this role. In this work we propose a different approach, based on the application of a semi-analytical model to produce mock populations of radio loud active galaxies throughout several orders of magnitude in power, and the comparison with observational samples. The aim of this work is to test the ability of our semi-analytical model to reproduce luminosity and size distributions of large numbers of sources from the radio-loud active galactic nuclei sample from the LoTSS survey. We apply our semi-analytical model for the evolution of radio galaxies and generate hundreds of thousands of sources applying random selection of parameters within probability distributions for each of them. Our results show that the model is able to reproduce the main features of the observed sample, and identifies jet mass-load included in our model and activity periods as critical parameters that should be addressed in more detail in future work. These initial results allow us to establish a maximum activity period ranging from 10 to 200 Myr within an active time distribution probability p(t_max) \propto 1/t_{max}. We also reproduce the radio luminosity function for the z<0.6 population, and the jet power spectrum from 10^{34.5} W to 10^{38} W. Our results show that mass-load is a fundamental parameter in the determination of radio source luminosities with distance, mainly in the low-power regime. Our model predicts that at least 3-4 x 10^{5} radio galaxies must exist in the LoTSS field in order to obtain the 17045 observed ones. This population is vastly dominated by low power sources.
