Spectral age distribution for radio-loud active galaxies in the XMM -LSS field
Spectral age distribution for radio-loud active galaxies in the XMM -LSS field
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XMM -LSS 场中射电响亮活动星系的光谱年龄分布
DOI：
10.1093/mnras/stad1432
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发表时间：
2023
影响因子：
4.8
通讯作者：
Pinjarkar S
中科院分区：
文献类型：
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作者：
Pinjarkar S
从射电强活动星系核中心喷射出的高能粒子射流（如 FR I 型和 FR II 型源中所见）会影响星团内介质/星系间介质周围的源。为了测量射流功率并确定对反馈的影响，对此类源的寿命施加限制非常重要。为了使用光谱年龄模型评估这些光源的年龄，我们需要高分辨率的多波长数据。 XMM-LSS 场的新的灵敏且高分辨率的 MIGHTEE 勘测，以及来自低频阵列 (LOFAR) 和巨型米波射电望远镜 (GMRT) 的数据，提供了在不同频率下以相似分辨率采集的数据，这使我们能够确定勘测场中射电强 AGN 的频谱年龄分布。在这项研究中，我们提出了 28 个射电星系的样本，并使用 Jaffe-Perola (JP) 模型逐像素分析了它们的最佳拟合光谱年龄分布。拟合度总体不错，我们样本中的物体显示的最大年龄在 2.8 至 115 Myr 范围内，中位数为 8.71 Myr。需要在一定频率范围内的高分辨率地图来观察小源的详细年龄分布，并且需要高灵敏度地图来观察更微弱的扩展发射。我们没有观察到源的总物理尺寸与其年龄之间的任何相关性，并且我们推测动力学模型和光谱年龄分析方法可能需要进行一些修改才能解释我们的观察结果。
Jets of energetic particles, as seen in FR type-I and FR type-II sources, ejected from the centre of radio-loud AGN affect the sources surrounding the intracluster medium/intergalactic medium. Placing constraints on the age of such sources is important in order to measure the jet powers and determine the effects on feedback. To evaluate the age of these sources using spectral age models, we require high-resolution multiwavelength data. The new sensitive and high-resolution MIGHTEE survey of theXMM-LSS field, along with data from the Low Frequency Array (LOFAR) and the Giant Metrewave Radio Telescope (GMRT) provide data taken at different frequencies with similar resolution, which enables us to determine the spectral age distribution for radio-loud AGN in the survey field. In this study, we present a sample of 28 radio galaxies with their best-fitting spectral age distribution analysed using the Jaffe–Perola (JP) model on a pixel-by-pixel basis. Fits are generally good, and objects in our sample show maximum ages within the range of 2.8 to 115 Myr with a median of 8.71 Myr. High-resolution maps over a range of frequencies are required to observe detailed age distributions for small sources, and high-sensitivity maps will be needed in order to observe fainter extended emission. We do not observe any correlation between the total physical size of the sources and their age, and we speculate that both dynamical models and the approach to spectral age analysis may need some modification to account for our observations.