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arXiv 1802.04533astro-ph.CO
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利用暗能量巡天科学验证数据对SPT选定星系团的弱透镜分析

Weak Lensing Analysis of SPT selected Galaxy Clusters using Dark Energy Survey Science Verification Data

C. Stern, J. P. Dietrich, S. Bocquet, D. Applegate, J. J. Mohr, S. L. Bridle, M. Carrasco Kind, D. Gruen, M. Jarvis, T. Kacprzak, A. Saro, E. Sheldon, M. A. Tro… 展开作者

C. Stern, J. P. Dietrich, S. Bocquet, D. Applegate, J. J. Mohr, S. L. Bridle, M. Carrasco Kind, D. Gruen, M. Jarvis, T. Kacprzak, A. Saro, E. Sheldon, M. A. Troxel, J. Zuntz, B. A. Benson, R. Capasso, I. Chiu, S. Desai, D. Rapetti, C. L. Reichardt, B. Saliwanchik, T. Schrabback, N. Gupta, T. M. C. Abbott, F. B. Abdalla, S. Avila, E. Bertin, D. Brooks, D. L. Burke, A. Carnero Rosell, J. Carretero, F. J. Castander, C. B. D'Andrea, L. N. da Costa, C. Davis, J. De Vicente, H. T. Diehl, P. Doel, J. Estrada, A. E. Evrard, B. Flaugher, P. Fosalba, J. Frieman, J. García-Bellido, E. Gaztanaga, R. A. Gruendl, J. Gschwend, G. Gutierrez, D. Hollowood, T. Jeltema, D. Kirk, K. Kuehn, N. Kuropatkin, O. Lahav, M. Lima, M. A. G. Maia, M. March, P. Melchior, F. Menanteau, R. Miquel, A. A. Plazas, A. K. Romer, E. Sanchez, R. Schindler, M. Schubnell, I. Sevilla-Noarbe, M. Smith, R. C. Smith, F. Sobreira, E. Suchyta, M. E. C. Swanson, G. Tarle, A. R. Walker

摘要:

我们提出了弱透镜(WL)的质量约束的大规模星系团的南极望远镜(SPT)通过Sunyaev-Zeldovich效应(SZE)检测的样本。我们使用从科学验证(SV)阶段的暗能量调查(DES)获得的$griz$成像数据,以适应的WL剪切信号的红移范围内的33个集群$0.25 \le z \le 0.8$与NFW配置文件,并约束一个四参数的SPT质量可观测的关系。为了解释WL质量的偏差,我们引入了WL质量与真实质量的比例关系,该关系由平均偏差和内在对数正态分布描述。我们允许相关的WL和SZE质量可观测的关系内的散射,并使用模拟来约束先验的滋扰参数相关的偏见和散射WL。我们约束的$ζ-M_{500}$关系,$A_\mathrm{SZ}=12.0_{-6.7}^{+2.6}$规范化时,使用的质量斜率$B_\mathrm{SZ}$从最新的SPT集群宇宙学分析的先验。在没有此先验的情况下,我们恢复$A_\mathrm{SZ}=10.8_{-5.2}^{+2.3}$和$B_\mathrm{SZ}=1.30_{-0.44}^{+0.22}$。在这两种情况下的结果意味着较低的集群质量比在以前的工作中测量和没有WL,虽然不确定性很大。$B_\mathrm{SZ}$的WL导出值$\approx 20\%$低于最新SPT星团宇宙学分析的首选值。在这项工作中所展示的方法的目的是约束集群质量和宇宙学参数同时,并将形成后续研究的基础上,采用完整的SPT集群样本与DES数据。

英文摘要:

We present weak lensing (WL) mass constraints for a sample of massive galaxy clusters detected by the South Pole Telescope (SPT) via the Sunyaev-Zeldovich effect (SZE). We use $griz$ imaging data obtained from the Science Verification (SV) phase of the Dark Energy Survey (DES) to fit the WL shear signal of 33 clusters in the redshift range $0.25 \le z \le 0.8$ with NFW profiles and to constrain a four-parameter SPT mass-observable relation. To account for biases in WL masses, we introduce a WL mass to true mass scaling relation described by a mean bias and an intrinsic, log-normal scatter. We allow for correlated scatter within the WL and SZE mass-observable relations and use simulations to constrain priors on nuisance parameters related to bias and scatter from WL. We constrain the normalization of the $ζ-M_{500}$ relation, $A_\mathrm{SZ}=12.0_{-6.7}^{+2.6}$ when using a prior on the mass slope $B_\mathrm{SZ}$ from the latest SPT cluster cosmology analysis. Without this prior, we recover $A_\mathrm{SZ}=10.8_{-5.2}^{+2.3}$ and $B_\mathrm{SZ}=1.30_{-0.44}^{+0.22}$. Results in both cases imply lower cluster masses than measured in previous work with and without WL, although the uncertainties are large. The WL derived value of $B_\mathrm{SZ}$ is $\approx 20\%$ lower than the value preferred by the most recent SPT cluster cosmology analysis. The method demonstrated in this work is designed to constrain cluster masses and cosmological parameters simultaneously and will form the basis for subsequent studies that employ the full SPT cluster sample together with the DES data.

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