论文标题
在极端模拟中的紧凑星系的形成
Formation of compact galaxies in the Extreme-Horizon simulation
论文作者
论文摘要
我们介绍了极端的宇宙学模拟：EH模型的星系形成具有恒星和AGN的反馈，并在白术和尾巴层状培养基中使用了非常高的分辨率。与其他模拟相比，低密度区域的高分辨率在红移$ z = 2 $处导致较小尺寸的大型星系与观察结果更好。这是由于对星系上积聚的冷气流的改进建模而产生的。此外，EH模拟形成了一个特别紧凑的星系，其恒星质量为$ 10^{10-11} $ \，m $ _ \ sun $，它们让人联想到观察到的超型星系，$ z \ simeq2 $。这些物体主要是通过重复的低质量祖细胞的重复合并而形成的，独立于重型反馈机制。在模拟中，使用低密度分离区域中的分辨率太低，可以错过此形成过程。
We present the Extreme-Horizon (EH) cosmological simulation: EH models galaxy formation with stellar and AGN feedback and uses a very high resolution in the intergalactic and circumgalactic medium. The high resolution in low-density regions results in smaller-size massive galaxies at redshift $z=2$, in better agreement with observations compared to other simulations. This results from the improved modeling of cold gas flows accreting onto galaxies. Besides, the EH simulation forms a population of particularly compact galaxies with stellar masses of $10^{10-11}$\,M$_\sun$ that are reminiscent of observed ultracompact galaxies at $z\simeq2$. These objects form mainly through repeated major mergers of low-mass progenitors, independently of baryonic feedback mechanisms. This formation process can be missed in simulations using a too low resolution in low-density intergalactic regions.
