Studies on the formation of first stars by radiation hydrodynamical simulations

2015 Fiscal Year Final Research Report

• Project/Area Number: 25400279
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Particle/Nuclear/Cosmic ray/Astro physics
• Research Institution: Konan University
• Principal Investigator: Susa Hajime 甲南大学, 理工学部, 教授 (00323262)
• Co-Investigator(Renkei-kenkyūsha): HASEGAWA Kenji 名古屋大学, 大学院理学研究科, 助教 (20536627) ; TOMINAGA Nozomu 甲南大学, 理工学部, 准教授 (00550279)
• Project Period (FY): 2013-04-01 – 2016-03-31
• Keywords: 初代星 / 形成 / 輻射流体

Outline of Final Research Achievements

We perform radiation hydrodynamics numerical simulations to study the birth of the first stars. We find the mass of the stars found in our simulations are in the range of 1Msun < M < 300 Msun, peaking at several x 10 Msun. We also find some fraction of the low mass stars are ejected to the outer envelope of the host minihalos. As a result, they remain less massive since they do not accrete the ambient gas efficiently. In addition, if low mass stars with M < 0.8Msun are born, which could survive until today, we find that the previously reported obsevations already put a constraint on the theory that the number of survived low mass stars per minihalo has to be less than O(1).

Free Research Field

宇宙物理学