Cosmological Impact of the Population III Hypernovae

26th IUPAP Conference on Computational Physics

物理学;计算机科学

Chen, Ke-Jung^1,2

Department of Astronomy and Astrophysics, University of California, 1156 High St., Santa Cruz

CA

95064, United States^1

School of Physics and Astronomy, University of Minnesota, 116 Church St., Minneapolis

MN

55455, United States^2

关键词: Core collapse supernovae;    Early universe;    Heavy elements;    Intergalactic medium;    Large amounts;    Metal enrichment;    Star formations;    Stellar evolutions;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/640/1/012057/pdf
DOI  :  10.1088/1742-6596/640/1/012057

学科分类：计算机科学（综合）

来源: IOP

【 摘 要 】

We investigate the stellar feedback of Pop III hypernovae by using cosmology simulations with GADGET. Recent studies of the Pop III star formation suggested that these stars might be very massive and many of them might have died as hypernovae, which are about ten times more energetic than conventional core-collapse supernovae. Such exotic supernovae might posit a strong impact on the early universe by injecting a large amount of energy and heavy elements. For investigating the cosmological impact of the first hypernovae, we use the realistic Pop III stellar evolution models including the relevant physics to simulate the formation, evolution, and hypernova explosion of a 60 MoPop III star. Our results show that the gas inside the host minihalo is effectively blown out by the ramp pressure of radiation and hypernova shock. It delays the star formation inside the halo for at least 50 million years. More importantly, the pristine gas of the intergalactic medium around the halo is chemically enriched to an average metallicity of 10-4- 10-3Zo, out to ∼ 2kpc within five hundred million years after the star dies. Such metal enrichment is able to transform the later star formation mode from Pop III to Pop II.