3月12日（火）13：30～15：00 太陽系小天体セミナー 南棟２階会議室
Mar 12 Tue Solar System Minor Body Seminar Conference Room, South Bldg.2F
3月12日（火）13：30～14：30 理論コロキウム 開発棟３号館３階会議室
Mar 12 Tue DTA colloquium Conference room, Instrument Development Bldg. 3 3F
詳細は以下をご覧下さい。
3月12日（火）
- キャンパス
- 三鷹
- セミナー名
- 太陽系小天体セミナー
- 定例・臨時の別
- 定例
- 日時
- 3月12日（火曜日）13時30分～15時
- 場所
- 南棟２階会議室
- 講演者
- 石村周平・古荘玲子
- 連絡先
- 名前：渡部潤一
- 備考
- テレビ会議またはスカイプによる参加も可
3月12日（火）
- Campus
- Mitaka
- Seminar
- DTA colloquium
- Regularly Scheduled/Sporadic
- Regularly Scheduled
- Date and time
- Mar 12, 2019, 13:30-14:30
- Place
- Conference room, Instrument Development Bldg. 3 3F
- Speaker
- Shingo Hirano
- Affiliation
- Kyushu University
- Title
- Environmental dependence of the first star formation
- Abstract
- First stars play vital roles in the early cosmic evolution by initiating cosmic reionization and chemical enrichment of the intergalactic medium. The characteristic mass of first stars (or initial mass function) is thus essential to understand the observational counterparts and formation and evolution of the first galaxies. We perform a set of cosmological simulations of early structure formation incorporating baryonic streaming motions, which are intrinsically generated in the early universe according to the standard model of structure formation. We find different first star formation depending on the initial streaming velocities: massive star, massive star cluster, and supermassive star. Interestingly, the latter two cases leave (1) a massive black hole binary, which can be a progenitor of strong gravitational wave sources similar to those recently detected by LIGO, and (2) a intermediate mass black hole, which can be a promising seed for the formation of observed high-z quasars, respectively.
- Facilitator
- -Name：Tomoya Takiwaki
- Comment
- in English