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arXiv 2211.09136astro-ph.GA
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一种新的恒星质量代用指标用于次晕吸光度匹配

A New Stellar Mass Proxy for Subhalo Abundance Matching

Chen-Yu Chuang, Yen-Ting Lin

摘要:

暗晕丰度匹配(SHAM)在提高我们对星系如何填充其宿主暗物质晕的理解方面发挥了重要作用。从本质上讲,SHAM框架是为了找到一个与星系属性(如恒星质量)最相关的暗物质晕属性。光环/次光环在其整个生命周期中所达到的最大圆速度($V_{\rm max}$)的峰值$V_{\rm peak}$一直是SHAM的流行选择。Tonnesen & Ostriker(2021)最近的一项研究表明,结合了当今$V_{\rm max}$和晕暗物质质量峰值的$ϕ$量在预测恒星质量方面比$V_{\rm peak}$表现更好。受他们的方法的启发,在这项工作中,我们发现,可以实现进一步的改进,结合了第90百分位的$V_{\rm max}$晕/次晕的暗物质晕时间变化率的第60百分位数的$ψ_5$量。基于模拟IllustrisTNG 300的测试表明,我们的新SHAM方案,只有三个自由参数,可以提高恒星质量预测和质量相关的聚簇分别从$ϕ$的15%和16%,在红移范围$z=0-2$。

英文摘要:

Subhalo abundance matching (SHAM) has played an important role in improving our understanding of how galaxies populate their host dark matter halos. In essence, the SHAM framework is to find a dark matter halo property that best correlates with an attribute of galaxies, such as stellar mass. The peak value of the maximum circular velocity ($V_{\rm max}$) a halo/subhalo has ever attained throughout its lifetime, $V_{\rm peak}$, has been a popular choice for SHAM. A recent study by Tonnesen & Ostriker (2021) suggested that quantity $ϕ$, which combines the present-day $V_{\rm max}$ and the peak value of halo dark matter mass, performs better in predicting stellar mass than $V_{\rm peak}$. Inspired by their approach, in this work, we find that further improvement can be achieved by a quantity $ψ_5$ that combines the 90th percentile of $V_{\rm max}$ a halo/subhalo has ever achieved with the 60th percentile of the dark matter halo time variation rate. Tests based on the simulation IllustrisTNG300 show that our new SHAM scheme, with just three free parameters, can improve the stellar mass prediction and mass-dependent clustering by 15% and 16% from $ϕ$, respectively, over the redshift range $z=0-2$.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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