Investigating the physical properties of the intracluster medium through high-resolution X-ray spectroscopy and high-resolution X-ray imaging

2023 Fiscal Year Final Research Report

• Project/Area Number: 20K14524
• Research Category: Grant-in-Aid for Early-Career Scientists
• Allocation Type: Multi-year Fund
• Review Section: Basic Section 16010:Astronomy-related
• Research Institution: Institute of Physical and Chemical Research (2023); Rikkyo University (2020-2022)
• Principal Investigator: Ichinohe Yuto 国立研究開発法人理化学研究所, 仁科加速器科学研究センター, 研究員 (30792519)
• Project Period (FY): 2020-04-01 – 2024-03-31
• Keywords: 銀河団 / X線分光

Outline of Final Research Achievements

We have succeeded in actually putting a constraint on the ICM effective viscosity for the method using fine structures on images, and have also developed several new methods. For the method using high-precision X-ray spectroscopy, we were able to develop a new data analysis method using deep learning. In addition, despite the significant delay in the launch of Resolve, observation data of galaxy clusters have been obtained one after another using Resolve, and the groundwork has been laid for significant progress in understanding the physics of the intracluster medium.

Free Research Field

宇宙物理学

Academic Significance and Societal Importance of the Research Achievements

銀河団プラズマの乱流・磁場などの物理状態は、宇宙物理学的にも宇宙論的にも重要であるが、理解がほとんど進んでいない。これらの問題は根本的に、これら基礎物理や実効的な物理パラメータを直接観測的に理解することによってのみ解決される。本研究により、銀河団のミクロな物理量を探るための重要な二つのプローブが大幅に進歩したと言える。物理を探る下地を整えたことで、来るXRISMの時代に向けて万全の体制で銀河団プラズマの物理状態を探ることができることになろう。