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2019.03.11-03.17

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

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