CFHT 82巡天中的质量-浓度关系和星晕质量比
The Mass-Concentration Relation and the Stellar-to-Halo Mass Ratio in the CFHT Stripe 82 Survey
摘要：
我们提出了一个新的测量质量浓度关系和恒星晕质量比的晕质量范围$5\times 10^{12}$至$2\times 10^{14}M_{\odot}$。为了实现这一目标，我们使用弱透镜测量CFHT条纹82调查（CS 82），结合中心星系redMapper集群目录和LOWZ/CMASS星系样本的斯隆数字巡天III重子振荡光谱巡天第十次数据发布。这些样本周围的叠加透镜信号被建模为来自中央星系、其暗物质晕和邻近晕的贡献之和，以及可能的中心误差项。我们测量了质量浓度关系：$c_{200c}(M)=A(\frac{M_{200c}}{M_0})^{B}$与$A=5.24\pm1.24, B=-0.13\pm0.10$（$0.2<z<0.4$）和$A=6.61\pm0.75, B=-0.15\pm0.05$（$0.4<z<0.6$）。这些振幅和斜率与最近模拟的预测完全一致。我们还测量了我们的样品的恒星晕质量比，并发现结果与以前的测量透镜和其他技术相一致。
英文摘要：
We present a new measurement of the mass-concentration relation and the stellar-to-halo mass ratio over the halo mass range $5\times 10^{12}$ to $2\times 10^{14}M_{\odot}$. To achieve this, we use weak lensing measurements from the CFHT Stripe 82 Survey (CS82), combined with the central galaxies from the redMaPPer cluster catalogue and the LOWZ/CMASS galaxy sample of the Sloan Digital Sky Survey-III Baryon Oscillation Spectroscopic Survey Tenth Data Release. The stacked lensing signals around these samples are modelled as a sum of contributions from the central galaxy, its dark matter halo, and the neighboring halos, as well as a term for possible centering errors. We measure the mass-concentration relation: $c_{200c}(M)=A(\frac{M_{200c}}{M_0})^{B}$ with $A=5.24\pm1.24, B=-0.13\pm0.10$ for $0.2<z<0.4$ and $A=6.61\pm0.75, B=-0.15\pm0.05$ for $0.4<z<0.6$. These amplitudes and slopes are completely consistent with predictions from recent simulations. We also measure the stellar-to-halo mass ratio for our samples, and find results consistent with previous measurements from lensing and other techniques.
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