The life of radio galaxies in clusters: joint surveys by eROSITA and ASKAP

星团中射电星系的生命：eROSITA 和 ASKAP 的联合调查

• 批准号: 450861021
• 负责人: Professor Dr. Marcus Brüggen, Ph.D.
• 金额: --
• 依托单位: Hamburger Sternwarte
• 依托单位国家: 德国
• 项目类别: Research Grants
• 资助国家: 德国
• 项目状态: 未结题
• 来源: https://gepris.dfg.de/gepris/projekt/450861021?language=en
• 关键词: life; radio; galaxies; clusters; joint

Feedback by central radio galaxies controls the dilute gas in galaxy clusters and the dilute gas in galaxy clusters shapes the evolution of radio galaxies in clusters. We wish to study this reciprocal relation using two novel surveys: the eROSITA all-sky survey, eRASS1, in X-rays and the Evolutionary Map of the Universe (EMU) survey with the Australian ASKAP telescopes in the radio band.eROSITA will discover an unprecedented number of X-ray galaxy clusters and image them with an angular resolution of 30 arc seconds.The EMU pilot survey maps 270 square degrees of sky in the Dark Energy Survey field down to a noise level of about 25 $\mu$Jy/beam at 10 arc second resolution. It is expected to image and catalog about 200,000 radio sources. These catalogs are cross-matched against multi-wavelength catalogs, and where possible contain redshifts and classifications.We would like to perform an analysis of radio galaxies in clusters detected, both, with EMU and ineRASS1. In particular, we would like to perform a morphological study and investigate the properties of radio galaxies as a function of their environment. The main scientific questions are: How do radio galaxies evolve in a non-uniform, but static ICM? How do radio galaxies evolve in a dynamic ICM? What is the internal pressure budget of lobes? To answer these questions, we will apply sophisticated machine-learning techniques to these unique new radio and X-ray data.Correlations between the radio properties of the central source and the X-ray properties of the host cluster will yield unique insights into the mechanics of radio-mode feedback. In this part of the project, we focus on the question whether the energy input from the central radio galaxy is able to offset the cooling losses of the ICM.

中心射电星系的反馈控制着星系团中的稀释气体，而星系团中的稀释气体塑造了星系团中射电星系的演化。我们希望使用两个新的调查来研究这种互反关系：x射线中的eROSITA全天调查，eRASS1和澳大利亚ASKAP望远镜在无线电波段中的宇宙演化图（EMU）调查。eROSITA将发现数量空前的x射线星系团，并以30角秒的角分辨率对它们进行成像。EMU试点调查在暗能量调查领域绘制了270平方度的天空地图，以10角秒的分辨率将噪声水平降低到约25 $\mu$Jy/beam。预计将对大约20万个射电源进行成像和编目。这些星表与多波长星表交叉匹配，并在可能的情况下包含红移和分类。我们想对EMU和ineRASS1探测到的射电星系群进行分析。特别是，我们想进行形态学研究，并调查射电星系的特性作为其环境的函数。主要的科学问题是：射电星系是如何在一个非均匀但静态的ICM中演化的？射电星系在动态ICM中是如何演化的？叶的内压预算是多少？为了回答这些问题，我们将应用复杂的机器学习技术来处理这些独特的新无线电和x射线数据。中心源的射电特性与主星团的x射线特性之间的相关性将对射电模式反馈机制产生独特的见解。在项目的这一部分，我们关注的问题是来自中央射电星系的能量输入是否能够抵消ICM的冷却损失。