arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1502.01883astro-ph.CO
收藏

加拿大星系团比较计划:系统学的详细研究和最新的弱透镜质量

The Canadian Cluster Comparison Project: detailed study of systematics and updated weak lensing masses

Henk Hoekstra, Ricardo Herbonnet, Adam Muzzin, Arif Babul, Andisheh Mahdavi, Massimo Viola, Marcello Cacciato

摘要:

通过对更大样本的弱引力透镜分析得到的星系团质量越来越多地被用作重子标度关系比较的参考。在本文中,我们重新分析了作为加拿大集群比较项目的一部分研究的50个集群的样本。我们研究了集群质量的系统误差的主要来源。我们量化我们的形状测量的鲁棒性,并使用广泛的图像模拟经验校准我们的算法。源红移分布的修订使用最新的国家的最先进的光度红移目录,包括新的深近红外观测。尽管如此,我们发现测光红移测定的不确定性是我们质量估计的系统误差的最大来源。我们使用更新的质量来确定b,即普朗克探测到的星团的流体静力学质量的偏差。我们的结果表明1-b=0.76+-0.05(stat)}+-0.06(syst)},这并不能解决与初级宇宙微波背景测量的张力。

英文摘要:

Masses of clusters of galaxies from weak gravitational lensing analyses of ever larger samples are increasingly used as the reference to which baryonic scaling relations are compared. In this paper we revisit the analysis of a sample of 50 clusters studied as part of the Canadian Cluster Comparison Project. We examine the key sources of systematic error in cluster masses. We quantify the robustness of our shape measurements and calibrate our algorithm empirically using extensive image simulations. The source redshift distribution is revised using the latest state-of-the-art photometric redshift catalogs that include new deep near-infrared observations. Nonetheless we find that the uncertainty in the determination of photometric redshifts is the largest source of systematic error for our mass estimates. We use our updated masses to determine b, the bias in the hydrostatic mass, for the clusters detected by Planck. Our results suggest 1-b=0.76+-0.05(stat)}+-0.06(syst)}, which does not resolve the tension with the measurements from the primary cosmic microwave background.

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。

↑