Population III Supernova Remnants on The Formation of The First Galaxies I. Gas, Metals, and Stars

• Main Authors: Li-Hsin Chen, 陳立馨
• Other Authors: You-Hua Chu
• Format: Others
• Language: en_US
• Published: 2019
• Online Access: http://ndltd.ncl.edu.tw/handle/z4432p

碩士 === 國立臺灣大學 === 天文物理研究所 === 107 === Modern cosmological simulations successfully demonstrate that the hierarchical assembly of dark matter halos provided the gravitational wells that nurse the primordial gases to form the first stars and galaxies inside them. One of the most significant objects in the universe, the first galaxies, are naturally regarded as the foundation of the early Universe. To examine the effect of Pop III supernova remnants (SNRs) to the first galaxy formation, we perform high-resolution hydro simulations by considering initial Pop III SNRs from different Pop III initial mass functions (IMFs). We follow the mergers of Pop III SNRs with the primordial gas and study the consequent star formation in the first galaxies. We construct 18 models with different halo properties and Pop III SNR compositions. Our results suggest that it is still possible to form Pop III stars inside the first galaxies after the first supernovae, which inject extra metals and change the subsequent Pop II star formation history. We also find that Pop II stellar mass function in our simulated galaxies can be described by power-laws, dN/dM_star ∝ M_star^α, where the exponent α falls in a wide range of 1.37 – 4.76 (α = 2.35 for the Salpeter IMF). The mass distribution is highly sensitive to the previous Pop III supernovae and the properties of the host halos. Our study can provide a channel to correlate the populations of the first stars and supernovae to star formation inside these first galaxies which may be soon observed by the James Webb Space Telescope.