simba: Cosmological simulations with black hole growth and feedback
simba: Cosmological simulations with black hole growth and feedback
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DOI：
10.1093/mnras/stz937
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发表时间：
2019-01
影响因子：
4.8
通讯作者：
R. Dav'e;D. Anglés-Alcázar;D. Narayanan;Qi Li;M. Rafieferantsoa;S. Appleby
中科院分区：
文献类型：
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作者：
R. Dav'e;D. Anglés-Alcázar;D. Narayanan;Qi Li;M. Rafieferantsoa;S. Appleby
我们介绍了Simba模拟，新一代的Mufasa宇宙星系形成模拟使用Gizmo的无网格有限质量流体力学运行。Simba包括对Mufasa的亚分辨率恒星形成和反馈处方的更新，并通过Angles-Alcazar等人（2017）的扭矩限制吸积模型介绍了来自冷气体的黑洞生长和来自热气体的Bondi吸积，以及通过动能双极流出和x射线能量的黑洞反馈。在高爱丁顿比时，弹射速度为~10^3 km/s，在低于2%的爱丁顿比时，弹射速度增加到~8000 km/s，恒定动量输入为20L/c。辛巴还包括一个动态的粉尘生产、生长和破坏模型。我们的Simba运行（100 Mpc/h）^3和1024^3气体元素，再现了许多可观测到的数据，包括z=0-6时的星系质量函数、恒星质量-恒星形成速率主序列、HI和H2分数、z=0和z=2时的质量-金属丰度关系、恒星形成星系的大小、大质量晕中的热气体分数和z=0星系尘埃特性。然而，辛巴也产生了一个不够尖锐的z=0质量函数截断，并且对于低质量的淬灭星系来说尺寸太大。我们证明辛巴的喷流反馈是导致大质量星系熄灭的主要原因。
We introduce the Simba simulations, the next generation of the Mufasa cosmological galaxy formation simulations run with Gizmo's meshless finite mass hydrodynamics. Simba includes updates to Mufasa's sub-resolution star formation and feedback prescriptions, and introduces black hole growth via the torque-limited accretion model of Angles-Alcazar et al. (2017) from cold gas and Bondi accretion from hot gas, along with black hole feedback via kinetic bipolar outflows and X-ray energy. Ejection velocities are taken to be ~10^3 km/s at high Eddington ratios, increasing to ~8000 km/s at Eddington ratios below 2%, with a constant momentum input of 20L/c. Simba further includes an on-the-fly dust production, growth, and destruction model. Our Simba run with (100 Mpc/h)^3 and 1024^3 gas elements reproduces numerous observables, including galaxy stellar mass functions at z=0-6, the stellar mass--star formation rate main sequence, HI and H2 fractions, the mass-metallicity relation at z=0 and z=2, star-forming galaxy sizes, hot gas fractions in massive halos, and z=0 galaxy dust properties. However, Simba also yields an insufficiently sharp truncation of the z=0 mass function, and too-large sizes for low-mass quenched galaxies. We show that Simba's jet feedback is primarily responsible for quenching massive galaxies.