Multi-wavelength study of evolution of galaxy clusters, thermodynamics of intracluster medium, and origin of diffuse radio emission

2017 Fiscal Year Final Research Report

• Project/Area Number: 15K17610
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Multi-year Fund
• Research Field: Astronomy
• Research Institution: Japan Aerospace EXploration Agency
• Principal Investigator: UEDA Shutaro 国立研究開発法人宇宙航空研究開発機構, 宇宙科学研究所, 宇宙航空プロジェクト研究員 (40748258)
• Project Period (FY): 2015-04-01 – 2018-03-31
• Keywords: 銀河団 / X線天文学 / X線天文衛星ひとみ / 多波長観測 / 銀河団ガス

Outline of Final Research Achievements

This research focused on merging galaxy clusters to understand the evolution of large-scale structure through multi-wavelength observations done by X-ray, optical, and radio. In this research, we found a 100-kpc-scale gas motion in the well-known dynamically relaxed galaxy clusters. This indicates that the mass growth continuously takes plane even though galaxy cluster seems to be relaxed. We furthermore succeeded in measuring a velocity field of the intracluster medium in the entire core of the X-ray brightest cluster, the Perseus cluster, using Hitomi X-ray Observatory for the first time. In addition, we analyzed the data taken by Chandra, Atacama Large Millimeter/submillimeter Array (ALMA), and Hubble Space Telescope for the well-known merging clusters and revealed the thermodynamical properties of intracluster medium and geometry of mergers.

Free Research Field

銀河団の観測的研究