论文标题
SIMBA模拟中角动量质量关系的测量
Measurements of the angular momentum-mass relations in the Simba simulation
论文作者
论文摘要
我们介绍了从Simba宇宙流体动力学模拟中得出的星系的特定角动量含量（J）的测量。对于恒星，HI和Baryonic物质成分，我们证明了J和质量之间存在非常紧密的关系，其中HI质量表面密度降低至1 MSUN/PC^2。这些关系与多种经验测量广泛一致。我们证实了观察结果，即恒星J-M关系中的散射主要由HI含量驱动，并测量其散射对星系偏离其他重要缩放关系的偏差的依赖性。对于给定的恒星质量，高富含高/较差的星系具有比恒星特异性角动量更高/低。 HI质量分数存在类似但较弱的相关性。总体而言，我们的结果证明了Simba模拟的实用性，作为理解和背景信息的平台，即即将进行的大型星系调查的数据和结果。
We present measurements of the specific angular momentum content (j) of galaxies drawn from the Simba cosmological hydrodynamic simulations. For the stellar, HI and baryonic matter components we demonstrate the existence of extremely tight relations between j and the mass contained within the radius at which the HI mass surface density decreases to 1 Msun/pc^2. These relations are broadly consistent with a variety of empirical measurements. We confirm the observational result that the scatter in the stellar j-M relation is driven largely by HI content, and measure the dependence of its scatter on the deviations of galaxies from other important scaling relations. For a given stellar mass, HI-rich/poor galaxies have more/less-than-average stellar specific angular momentum. A similar, yet weaker, correlation exists for HI mass fraction. Overall, our results demonstrate the utility of the Simba simulations as a platform for understanding and contextualising the data and results from forthcoming large galaxy surveys.
