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A flexible subhalo abundance matching model for galaxy clustering in redshift space
Monthly Notices of the Royal Astronomical Society ( IF 4.8 ) Pub Date : 2021-09-09 , DOI: 10.1093/mnras/stab2560
S Contreras 1 , R E Angulo 1, 2 , M Zennaro 1
Affiliation  

We develop an extension of subhalo abundance matching (SHAM) capable of accurately reproducing the real and redshift-space clustering of galaxies in a state-of-the-art hydrodynamical simulation. Our method uses a low-resolution gravity-only simulation and it includes orphan and tidal disruption prescriptions for satellite galaxies, and a flexible amount of galaxy assembly bias. Furthermore, it includes recipes for star formation rate (SFR) based on the dark matter accretion rate. We test the accuracy of our model against catalogues of stellar-mass- and SFR-selected galaxies in the TNG300 hydrodynamic simulation. By fitting a small number of free parameters, our extended SHAM reproduces the projected correlation function and redshift-space multipoles for number densities $10^{-3} - 10^{-2}\, h^{3}{\rm Mpc}^{-3}$, at z = 1 and z = 0, and for scales r ∈ [0.3 − 20]h−1Mpc. Simultaneously, the SHAM results also retrieve the correct halo occupation distribution, the level of galaxy assembly bias, and higher order statistics present in the TNG300 galaxy catalogues. As an application, we show that our model simultaneously fits the projected correlation function of the SDSS in three disjoint stellar mass bins, with an accuracy similar to that of TNG300 galaxies. This SHAM extension can be used to get accurate clustering prediction even when using low and moderate-resolution simulations.

中文翻译:

红移空间星系聚类的灵活亚晕丰度匹配模型

我们开发了亚晕丰度匹配 (SHAM) 的扩展,能够在最先进的流体动力学模拟中准确再现星系的真实和红移空间聚类。我们的方法使用低分辨率的仅重力模拟,它包括卫星星系的孤儿和潮汐破坏处方,以及灵活数量的星系组装偏差。此外,它还包括基于暗物质吸积率的恒星形成率 (SFR) 配方。我们在 TNG300 流体动力学模拟中针对恒星质量和 SFR 选择的星系目录测试了我们模型的准确性。通过拟合少量自由参数,我们的扩展 SHAM 再现了数字密度 $10^{-3} - 10^{-2}\, h^{3}{\rm Mpc} 的投影相关函数和红移空间多极点^{-3}$,在 z = 1 和 z = 0 时,对于尺度 r ∈ [0.3 − 20]h−1Mpc。同时,SHAM 结果还检索了 TNG300 星系目录中存在的正确晕占据分布、星系组装偏差水平和高阶统计数据。作为一个应用,我们展示了我们的模型在三个不相交的恒星质量箱中同时拟合了 SDSS 的投影相关函数,其精度与 TNG300 星系相似。即使在使用低分辨率和中等分辨率的模拟时,此 SHAM 扩展也可用于获得准确的聚类预测。我们表明,我们的模型同时在三个不相交的恒星质量箱中拟合了 SDSS 的投影相关函数,其精度与 TNG300 星系相似。即使在使用低分辨率和中等分辨率的模拟时,此 SHAM 扩展也可用于获得准确的聚类预测。我们表明,我们的模型同时在三个不相交的恒星质量箱中拟合了 SDSS 的投影相关函数,其精度与 TNG300 星系相似。即使在使用低分辨率和中等分辨率的模拟时,此 SHAM 扩展也可用于获得准确的聚类预测。
更新日期:2021-09-09
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