论文标题
人口III超新星如何确定第一星系的特性
How Population III Supernovae Determined the Properties of the First Galaxies
论文作者
论文摘要
大量的流行III星可以像能量的超新星一样死亡，它用金属丰富了早期的宇宙，并确定了第一个星系的特性。 $ z \ gtrsim 10 $的质量约为$ 10^9 $ msun，这些星系被认为是银河系的祖先。本文研究了流行III超新星残留物（SNR）的影响，来自萨彼得状和最高的初始质量功能（IMF）对具有ENZO代码的高分辨率辐射流动力学模拟的第一星系的形成。我们的发现表明，来自顶级流行III IMF的SNR会产生更多的金属，从而在第一个星系中导致更有效的气体冷却和更早的POP II星形成。这些星系的中央区域可以形成几百到几千名流行II星。这些恒星的金属度为$ 10^{ - 3} $至$ 10^{ - 2} $，ZSUN，比极端金属贫困（EMP）星星大。它们的质量功能遵循$ dn（m _*）/dm_*\ propto m _*^α$的幂律分布，其中$ m _*$是恒星质量，$α= 2.66-5.83 $，对于顶级IMF而言更陡峭。因此，我们发现EMP恒星不是大多数原始星系中的典型特征。
Massive Pop III stars can die as energetic supernovae that enrich the early universe with metals and determine the properties of the first galaxies. With masses of about $10^9$ Msun at $z \gtrsim 10$, these galaxies are believed to be the ancestors of the Milky Way. This paper investigates the impact of Pop III supernova remnants (SNRs) from both Salpeter-like and top-heavy initial mass functions (IMFs) on the formation of first galaxies with high-resolution radiation-hydrodynamical simulations with the ENZO code. Our findings indicate that SNRs from a top-heavy Pop III IMF produce more metals, leading to more efficient gas cooling and earlier Pop II star formation in the first galaxies. From a few hundred to a few thousand Pop II stars can form in the central regions of these galaxies. These stars have metallicities of $10^{-3}$ to $10^{-2}$, Zsun, greater than those of extremely metal-poor (EMP) stars. Their mass function follows a power-law distribution with $dN(M_*)/dM_* \propto M_*^α$, where $M_*$ is stellar mass and $α= 2.66 - 5.83$ and is steeper for a top-heavy IMF. We thus find that EMP stars were not typical of most primitive galaxies.
