The emergence of the supermassive black hole-galaxy mass relations at z > 1

2022 Fiscal Year Final Research Report

• Project/Area Number: 18H01251
• 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: The University of Tokyo
• Principal Investigator: Silverman John 東京大学, カブリ数物連携宇宙研究機構, 教授 (90573030)
• Project Period (FY): 2018-04-01 – 2021-03-31
• Keywords: supermassive black holes / near-infrared / galaxy evolution / coevolution

Outline of Final Research Achievements

We have determined the relation between black hole mass and stellar mass of quasar host galaxies out to z ~ 2 using the Hubble Space Telescope and the Subaru telescope. We find that the mass ratio is nearly constant (i.e., non-evolving) over the last 8 billion years of the universe. This is supported by the analysis of 584 quasars from the Sloan Digital Sky Survey which have their host galaxies imaged by the Hyper Suprime-Cam Subaru Strategic Program. We also found for the first time that the dispersion in the mass ratio is nearly constant and in agreement with simulations which include quasar feedback to regulate their joint mass growth. Overall, we find that supermassive black holes and their host galaxies are growing together in a co-evolutionary manner, likely by sharing a common fuel supply which simultaneously provides gas to form new stars, builds up the central stellar mass concentration, and accretes onto the central black hole.

Free Research Field

galaxy evolution

Academic Significance and Societal Importance of the Research Achievements

本課題において，国際的な論文誌にて複数の論文を出版した．また，国際学会においても研究成果の発表を行った．結果として，本研究は初期宇宙におけるクェーサー母銀河の研究に高い影響を与え，ジェームズウェッブ宇宙望遠鏡なども用いた該当分野の研究を国際的にリードしている.