Formation of the first galaxies in the aftermath of the first supernovae
Formation of the first galaxies in the aftermath of the first supernovae
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第一个超新星爆发后第一个星系的形成
DOI：
10.1093/mnras/stab2637
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发表时间：
2021
影响因子：
4.8
通讯作者：
Abe M
中科院分区：
文献类型：
--
作者：
Abe M
我们进行了高分辨率的宇宙学流体动力学模拟，以研究第一个达到108 − 9 h − 1 M atz= 9质量的星系的形成。模拟的分辨率高到足以解决迷你晕，并使我们能够成功地追求多个人口（Pop）III恒星的形成，他们的超新星（SN）爆炸，由此产生的金属富集的星系间介质（IGM）在系统的建立过程中。金属被多个Pop III SNe喷射到IGM中，但一些富含金属的气体福尔斯随后又落回晕上。第一个星系的星星形成历史敏感地依赖于Pop III恒星的初始质量函数（IMF）。在幂律的Pop III IMF，dn/dM <$M− 2.35，质量范围10−500 M <$M的情况下，主要的恒星星族从Pop III过渡到Pop II，跃迁速率为12−15。在12年，恒星稳定地形成在第一个星系中，星星形成率为10−3−10− 1 M <$yr−1。相比之下，对于平坦IMF的情况，由于频繁的Pop III对不稳定性SNe，导致随后的Pop II星星形成的抑制，形成缺乏气体的第一个星系。此外，我们还计算了第一星系的UV连续谱、Lyα线和Hα线通量。我们表明，詹姆斯·韦伯空间望远镜将能够探测到第一批晕质量为109 M的星系的紫外连续谱、Lyα和Hα线发射。
We perform high-resolution cosmological hydrodynamic simulations to study the formation of the first galaxies that reach the masses of 108 − 9h−1M⊙atz= 9. The resolution of the simulations is high enough to resolve minihaloes and allow us to successfully pursue the formation of multiple Population (Pop) III stars, their supernova (SN) explosions, resultant metal-enrichment of the inter-galactic medium (IGM) in the course of the build-up of the system. Metals are ejected into the IGM by multiple Pop III SNe, but some of the metal-enriched gas falls back on to the halo after. The star formation history of the first galaxy depends sensitively on the initial mass function (IMF) of Pop III stars. The dominant stellar population transits from Pop III to Pop II atz∼ 12−15 in the case of power-law Pop III IMF, dn/dM∝M−2.35with the mass range 10−500 M⊙. Atz≲ 12, stars are stably formed in the first galaxies with a star formation rate of ∼10−3−10−1M⊙yr−1. In contrast, for the case with a flat IMF, gas-deprived first galaxies form due to frequent Pop III pair-instability SNe, resulting in the suppression of subsequent Pop II star formation. In addition, we calculate UV continuum, Lyα- and Hα-line fluxes from the first galaxies. We show that theJames Webb Space Telescopewill be able to detect both UV continuum, Lyα and Hα line emission from first galaxies with halo mass ≳ 109M⊙atz≳ 10.