Study on gas supply process from AGN tori to accretion disks with multi-group radiation hydrodynamic simulations

2015 Fiscal Year Final Research Report

• Project/Area Number: 25800100
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Multi-year Fund
• Research Field: Astronomy
• Research Institution: University of Tsukuba
• Principal Investigator: NAMEKATA Daisuke 筑波大学, 計算科学研究センター, 研究員 (40610043)
• Research Collaborator: UMEMURA Masayuki 筑波大学, 計算科学研究センター, 教授 (70183754) ; HASEGAWA Kenji 名古屋大学, 大学院理学研究科宇宙論研究室(C研), 助教 (20536627)
• Project Period (FY): 2013-04-01 – 2016-03-31
• Keywords: 活動銀河核 / 活動銀河核トーラス / 星間ガス / 輻射流体力学 / 数値シミュレーション

Outline of Final Research Achievements

We have conducted theoretical studies relevant to the gas supply process from active galactic nucleus (AGN) tori to supermassive black hole (SMBH) accretion disks to advance our understanding of the AGN activities. Using multi-dimensional radiation hydrodynamic simulations, we have revealed typical evolutionary patterns of molecular clouds directly exposed to AGN radiation and have shown that the destruction timescales of the clouds are shorter than the dynamical timescales. We have also found that a nearly-neutral, geometrically-thin, dense dusty gas disk forms near the dust sublimation radius and a high-velocity outflow is launched from the disk surface. The mass outflow rate is as large as 20-40 % of the Eddington mass accretion rate under realistic conditions.

Free Research Field

理論天文学