2018 Fiscal Year Annual Research Report
Understanding formation of supermassive black hole seeds at high-redshift via direct collapse
| Project/Area Number |
16H02163
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| Research Institution | Osaka University |
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Principal Investigator |
Shlosman Isaac 大阪大学, 理学研究科, 招へい教授 (40772405)
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| Co-Investigator(Kenkyū-buntansha) |
長峯 健太郎 大阪大学, 理学研究科, 教授 (50714086)
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| Project Period (FY) |
2016-04-01 – 2019-03-31
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| Keywords | 理論天文学 / 巨大ブラックホール / 銀河形成 / 流体力学 / ダイレクトコラプス / 輻射輸送 |
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| Outline of Annual Research Achievements |
The goal of the 3rd year in our project was to calculate the advanced stage of direct collapse to a supermassive black hole seeds. We modeled the trapping of the continuum produced by the collapsing baryons, and formation of the core photosphere of the collapse. We have involved radiation transfer in the continuum. We solved the equation of radiative transfer in the Flux-Limited Diffusion (FLD) approximation, in tandem with the gravitational hydrodynamics of the collapse, including the radiation force in the Euler equation.
Our results have, for the first time, demonstrated formation of the photosphere within the central 0.0001 pc of the 100 million solar mass dark matter halos. We have shown that the photons have been capable of escaping via preferred directions, developing convection. To demonstrate that the adiabatic approximation is inconsistent with the dynamics of the collapse, we compared our runs to adiabatic run, which cuts off the cooling. In summary, evolution of the adiabatic models diverges from that of the models involving a self-consistent radiation transfer.
Finally, we have shown that the opaque core of the collapse is unstable, develops radiation-driven winds and can dissolve or its growth can be saturated. The current paradigm of a monotonic growth of the central core is not fulfilled with radiation transfer. Lastly, we find that the central core increases its spin with time, when the accretion flow with larger angular momentum arrives. This may lead to the formation of a self-gravitating disk with no central compact object.
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| Research Progress Status |
平成30年度が最終年度であるため、記入しない。
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| Strategy for Future Research Activity |
平成30年度が最終年度であるため、記入しない。
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