Rapid supermassive black hole growth revealed by multi-wavelength surveys

2023 Fiscal Year Final Research Report

• Project/Area Number: 20H01939
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Single-year Grants
• Section: 一般
• Review Section: Basic Section 16010:Astronomy-related
• Research Institution: Waseda University (2022-2023); Tohoku University (2020-2021)
• Principal Investigator: Ichikawa Kohei 早稲田大学, 理工学術院, 准教授(任期付) (40756293)
• Co-Investigator(Kenkyū-buntansha): 山下 拓時 国立天文台, ハワイ観測所, 特任研究員 (20800759)
• Project Period (FY): 2020-04-01 – 2023-03-31
• Keywords: 超巨大ブラックホール / 活動銀河核 / X線 / 赤外線 / eROSITA / すばる望遠鏡

Outline of Final Research Achievements

This goal of this project is to explore and understand the properties of previously missing obscured active galactic nuclei and massive black hole candidate objects by combining the large area multi-wavelength surveys, such as Subaru HSC SSP survey, VLASS radio survey, eROSITA X-ray survey, and WISE infrared survey.
We succeed constructing the samples with key properties for the growth of supermassive black holes, such as understanding the gas distribution around buried active galactic nuclei through the first statistical X-ray sample of DOGs, discovering radio sources those are extremely faint in the optical, and constructing a sample of buried active galactic nuclei that are bright in both radio and X-ray in high redshift Universe.

Free Research Field

天文学

Academic Significance and Societal Importance of the Research Achievements

本研究を通して、現在利用可能な広域多波長データには多くの見過ごされてきた活動銀河核種族が存在することがわかった。本多波長データのレガシーバリューは非常に高く、今後も本サンプルを通じて超巨大ブラックホール成長の理解に迫ることができる。また、今後サーベイがスタートするEuclid赤外線衛星やLSST可視光望遠鏡との親和性も高く、本研究のノウハウを活かすことで将来的にもサンプル構築を進めることができる。