利用短时间曝光对 Abell 2390 进行弱透镜分析

A. Dutta, J. R. Peterson, T. Rose, M. Cianfaglione, A. Bonafede, G. Li, G. Sembroski
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引用次数: 0

摘要

我们利用 411 次短 60s 曝光中的第二矩形状测量结果,对 z =0.23 时的星系团 Abell 2390 进行了弱透镜分析。单个曝光的形状测量采用时刻匹配算法。当矩匹配算法在信噪比(SNR)较低的情况下无法收敛时,就会使用强制测量。利用反向误差权重将单个图像中的测量结果进行组合,以获得准确的光源形状,从而恢复剪切力。我们使用 PhoSimsimulations 验证了我们的管道所恢复的剪切测量结果。我们发现 Abell 2390 的质量与之前公布的结果一致。我们还发现电子模式图显示的丝状结构与重子结构一致,并恢复了使用光学和X射线数据发现的大多数星系团/星系群。因此,我们证明了利用弱透镜绘制宇宙大尺度结构图的可行性。我们还发现星系团的中心部分具有双峰质量分布,峰值的相对方向与X射线相似。我们讨论了关于这个星系团的早期研究,并表明后期的合并可以解释所有的观测数据。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Weak Lensing analysis of Abell 2390 using short exposures
We present a weak lensing analysis of the galaxy cluster Abell 2390 at z = 0.23 using second moment shape measurements made in 411 short 60s exposures. The exposures are obtained in three broadband photometric filters (g, r, i) using WIYN-ODI. Shape measurement in individual exposures is done using a moment matching algorithm. Forced measurement is used when the moment matching algorithm fails to converge at low signal to noise ratio (SNR). The measurements made in individual images are combined using inverse error weight to obtain accurate shape of sources and hence recover shear. We use PhoSim simulations to validate shear measurements recovered by our pipeline. We find the mass of Abell 2390 is in agreement with previously published results. We also find the E-Mode maps show filamentary structures consistent with baryonic structures and recovers most clusters/groups of galaxies found using Optical and X-Ray data. Thus we demonstrate the feasibility of using Weak Lensing to map large scale structure of the universe. We also find the central portion of the cluster has a bimodal mass distribution and the relative orientation of the peaks are similar to X-Ray. We discuss earlier research on this galaxy cluster and show that a late stage merger accounts for all the observed data.
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