Growth history of supermassive black holes probed by eROSITA, Subaru, and Seimei Telescope

2022 Fiscal Year Final Research Report

• Project/Area Number: 19K14759
• Research Category: Grant-in-Aid for Early-Career Scientists
• Allocation Type: Multi-year Fund
• Review Section: Basic Section 16010:Astronomy-related
• Research Institution: Kyoto University
• Principal Investigator: Yoshiki Toba 京都大学, 理学研究科, 研究員 (40825957)
• Project Period (FY): 2019-04-01 – 2023-03-31
• Keywords: 超巨大ブラックホール / すばる望遠鏡 / eROSITA衛星 / NuSTAR衛星 / SOFIA天文台 / eROSITA衛星

Outline of Final Research Achievements

In order to reveal the growth history of supermassive black holes (SMBHs), which are ubiquitous in the universe, we conducted a systematic search for active galactic nuclei (AGN) with various evolutionary stages and investigated their physical properties. By utilizing multi-wavelength data taken from Hyper Suprime-Cam on Subaru telescope (optical), eROSITA (X-ray), WISE (infrared), and VLA/FIRST (radio), we successfully identified AGN in a wide range of evolutionary stages from the growing to the mature phase of their growth. We also succeeded in estimating the physical quantities of these objects from the spectral energy distribution. These results were reported in a total of six referred papers I led.

Free Research Field

天文学

Academic Significance and Societal Importance of the Research Achievements

この研究から、宇宙にはこれまで見落とされてきたようなさまざまな成長段階にある超巨大ブラックホールを宿す銀河が存在することを確認できた点で意義深い。また、すばるHSCチームとeROSITAチームとの国際共同研究により、データの一般公開に先駆けて研究成果を発表できた点も大きい。
超巨大ブラックホールは社会的にも関心の大きいトピックであるため、一般講演などで観測成果をわかりやすく伝える活動を通じて、得られた知見を社会に還元するようにも努めた。