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arXiv 2109.02646astro-ph.GAastro-ph.CO
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大质量星系核的外恒星质量：一个具有与丰度相当的散射和约化投影效应的晕质量的简单示踪剂

The Outer Stellar Mass of Massive Galaxies: A Simple Tracer of Halo Mass with Scatter Comparable to Richness and Reduced Projection Effects

Song Huang, Alexie Leauthaud, Christopher Bradshaw, Andrew Hearin, Peter Behroozi, Johannes Lange, Jenny Greene, Joseph DeRose, Joshua S. Speagle, Enia Xhakaj

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28 pages, 12 figures, 1 table, 7 appendices. Submitted to MNRAS. Codes available at https://github.com/dr-guangtou/jianbing Data available at https://doi.org/10.5281/zenodo.5259075
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摘要：

利用“超级超级凸轮斯巴鲁战略计划”（HSC巡天）的弱引力透镜数据，研究了不同恒星质量估计在追踪晕质量方面的潜力。我们考虑星系的$\log {M_{\star}/M_{\odot}}>11.5$在0.2 < z < 0.5仔细测量的光剖面和集群的redMapPer和CAMIRA丰富的算法。我们设计了一种方法（“TopN”测试），以评估不同的示踪剂和相互比较晕质量代理在四个数量密度箱使用堆叠星系星系透镜配置文件的晕质量可观测的关系的散射。这项测试揭示了三个关键发现。在R<30 kpc范围内，基于cModel测光或孔径光度的恒星质量是晕质量的一个很差的代用指标。相比之下，恒星质量的外层信封是一个很好的晕质量代理。在R=[50，100] kpc，M*[50，100]范围内的恒星质量具有与$\log{M_{\rm vir}/M_{\odot}}>14.0$最先进的基于丰度的星团发现器相当的性能，并且可以在较低的晕质量下成为更好的晕质量示踪剂。最后，使用N体模拟，我们发现M*[50，100]选择的大质量晕的透镜轮廓与没有投影或偏心效应的样本的预期一致。另一方面，丰富度选择的集群在它们的透镜配置文件中在R~1 Mpc处显示出过量，这可能表明来自选择偏差的更显著的影响。这些结果表明，基于Mstar的示踪剂在识别大质量晕方面具有明显的优势，这可能为星团宇宙学开辟新的途径。

英文摘要：

Using the weak gravitational lensing data from the Hyper Suprime-Cam Subaru Strategic Program (HSC survey), we study the potential of different stellar mass estimates in tracing halo mass. We consider galaxies with $\log {M_{\star}/M_{\odot}}>11.5$ at 0.2 < z < 0.5 with carefully measured light profiles and clusters from the redMaPPer and CAMIRA richness-based algorithms. We devise a method (the "TopN" test) to evaluate the scatter in the halo mass-observable relation for different tracers and inter-compare halo mass proxies in four number density bins using stacked galaxy-galaxy lensing profiles. This test reveals three key findings. The stellar mass based on cModel photometry or aperture luminosity within R<30 kpc is a poor proxy of halo mass. In contrast, the stellar mass of the outer envelope is an excellent halo mass proxy. The stellar mass within R=[50,100] kpc, M*[50,100], has performance comparable to the state-of-the-art richness-based cluster finders at $\log{M_{\rm vir}/M_{\odot}}>14.0$ and could be a better halo mass tracer at lower halo masses. Finally, using N-body simulations, we find that the lensing profiles of massive halos selected by M*[50,100] are consistent with the expectation for a sample without projection or mis-centering effects. On the other hand, Richness-selected clusters display an excess at R~1 Mpc in their lensing profiles, which may suggest a more significant impact from selection biases. These results suggest that Mstar-based tracers have distinct advantages in identifying massive halos, which could open up new avenues for cluster cosmology.

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