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arXiv 2009.07591astro-ph.COastro-ph.GAgr-qc
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通过HST,VLT和Gemini-South的扩展弱透镜跟踪观测对遥远SPT星系团的质量校准

Mass calibration of distant SPT galaxy clusters through expanded weak lensing follow-up observations with HST, VLT & Gemini-South

T. Schrabback, S. Bocquet, M. Sommer, H. Zohren, J. L. van den Busch, B. Hernández-Martín, H. Hoekstra, S. F. Raihan, M. Schirmer, D. Applegate, M. Bayliss, B. … 展开作者

T. Schrabback, S. Bocquet, M. Sommer, H. Zohren, J. L. van den Busch, B. Hernández-Martín, H. Hoekstra, S. F. Raihan, M. Schirmer, D. Applegate, M. Bayliss, B. A. Benson, L. E. Bleem, J. P. Dietrich, B. Floyd, S. Hilbert, J. Hlavacek-Larrondo, M. McDonald, A. Saro, A. A. Stark, N. Weissgerber

摘要:

从以前的工作扩展,我们提出了弱透镜测量的总样本的30个遥远的($z_\mathrm{median}=0.93$)大规模星系团从南极望远镜Sunyaev-Zel 'dovich(SPT-SZ)调查,测量星系的形状在哈勃太空望远镜(HST)高级相机的调查图像。我们删除集群成员和优先选择$z\gtrsim 1.4$背景星系通过$V-I$颜色,采用深测光从VLT/FORS 2和双子座南/GMOS。我们采用修正的弱透镜形状测量和源红移分布的校准来估计集群的质量。结合较早的麦哲伦/Megacam的结果较低的红移集群,我们推断的SZ检测的意义和集群质量之间的标度关系的约束,特别是关于其红移的演变。从弱透镜效应数据推断出的质量尺度,与调和平坦普朗克$νΛ$ CDM宇宙学(其中中微子质量之和是一个自由参数)和观测到的SPT-SZ团簇计数所需的质量尺度相比,要低一个因子$0.76^{+0.10}_{-0.14}$(在我们的枢轴红移$z=0.6$)。为了灵敏地测试SPT集群和普朗克之间的(不)协议的水平,进一步扩大弱透镜后续样品是必要的。

英文摘要:

Expanding from previous work we present weak lensing measurements for a total sample of 30 distant ($z_\mathrm{median}=0.93$) massive galaxy clusters from the South Pole Telescope Sunyaev-Zel'dovich (SPT-SZ) Survey, measuring galaxy shapes in Hubble Space Telescope (HST) Advanced Camera for Surveys images. We remove cluster members and preferentially select $z\gtrsim 1.4$ background galaxies via $V-I$ colour, employing deep photometry from VLT/FORS2 and Gemini-South/GMOS. We apply revised calibrations for the weak lensing shape measurements and the source redshift distribution to estimate the cluster masses. In combination with earlier Magellan/Megacam results for lower-redshifts clusters we infer refined constraints on the scaling relation between the SZ detection significance and the cluster mass, in particular regarding its redshift evolution. The mass scale inferred from the weak lensing data is lower by a factor $0.76^{+0.10}_{-0.14}$ (at our pivot redshift $z=0.6$) compared to what would be needed to reconcile a flat Planck $νΛ$CDM cosmology (in which the sum of the neutrino masses is a free parameter) with the observed SPT-SZ cluster counts. In order to sensitively test the level of (dis-)agreement between SPT clusters and Planck, further expanded weak lensing follow-up samples are needed.

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