arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2104.10690astro-ph.CO
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一个新星系群样本的弱透镜质量

On the weak lensing masses of a new sample of galaxy groups

Elizabeth J. Gonzalez, Facundo Rodriguez, Manuel Merchán, Diego García Lambas, Martín Makler, Martín Chalela, Maria E. S. Pereira, Bruno Moraes, HuanYuan Shan

摘要:

星系群的质量对于将这些系统与暗物质晕宿主联系起来是很重要的。然而,获得准确的质量估计对于低质量星系群来说特别具有挑战性。此外,使用弱透镜估计的观测质量代理的校准主要集中在大规模集群。我们在这里提出了一个研究晕质量的星系群的样本确定根据光谱目录,跨越了很宽的质量范围。我们的分析的主要动机是评估质量估计所提供的星系群目录通过丰度匹配光度技术。我们得到总晕质量估计堆叠弱透镜分析。我们的研究允许测试的准确性,质量估计的基础上,这种技术作为一个代理的晕大集团样品的质量。透镜配置文件计算相结合的集团在不同的箱的丰度匹配的质量,丰富度和红移。拟合透镜质量与从丰度匹配获得的质量相关。然而,当考虑低质量和中等质量范围内的群体时,根据特征群体光度计算的质量往往预测比弱透镜分析确定的更高的值。如果所选的星系群有一个中心的早型星系,则在低质量范围内的一致性会提高。所提出的结果验证了使用的质量估计的基础上的丰度匹配技术,提供良好的代理晕主机质量在很宽的质量范围。

英文摘要:

Galaxy group masses are important to relate these systems with the dark matter halo hosts. However, deriving accurate mass estimates is particularly challenging for low-mass galaxy groups. Moreover, calibration of bservational mass-proxies using weak-lensing estimates have been mainly focused on massive clusters. We present here a study of halo masses for a sample of galaxy groups identified according to a spectroscopic catalogue, spanning a wide mass range. The main motivation of our analysis is to assess mass estimates provided by the galaxy group catalogue derived through an abundance matching luminosity technique. We derive total halo mass estimates according to a stacking weak-lensing analysis. Our study allows to test the accuracy of mass estimates based on this technique as a proxy for the halo masses of large group samples. Lensing profiles are computed combining the groups in different bins of abundance matching mass, richness and redshift. Fitted lensing masses correlate with the masses obtained from abundance matching. However, when considering groups in the low- and intermediate-mass ranges, masses computed according to the characteristic group luminosity tend to predict higher values than the determined by the weak-lensing analysis. The agreement improves for the low-mass range if the groups selected have a central early-type galaxy. Presented results validate the use of mass estimates based on abundance matching techniques which provide good proxies to the halo host mass in a wide mass range.

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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