论文标题
通过HST，VLT和Gemini-South进行扩展的弱透镜随访，对遥远的SPT星系簇进行质量校准
Mass calibration of distant SPT galaxy clusters through expanded weak lensing follow-up observations with HST, VLT & Gemini-South
论文作者
论文摘要
从先前的工作中扩展，我们提出了弱的透镜测量值，该样本总计30个（$ z_ \ mathrm {中位数} = 0.93 $），来自南极望远镜Sunyaev-Zel'dovich（spt-sz）的大型星系簇（SPT-SZ）调查，测量了Hubble Space Telescope（HST）的Galaxy shopes（HST）的高级塑形（HST），以进行效果。我们删除了群集成员，并优先选择$ z \ gtrsim 1.4 $背景星系通过$ v-i $颜色，采用VLT/fors2和gemini-south/gmos的深度光度。我们将修订的校准应用于弱透镜形状测量和源红移分布以估计簇质量。结合较低的麦芽岩/巨型晶体群的结果，我们推断出对SZ检测显着性与簇质量之间的缩放关系的精致约束，尤其是在其红移演化方面。从弱镜头数据中推断出的质量量表较低，$ 0.76^{+0.10} _ { - 0.14} $（在我们的枢轴红移$ z = 0.6 $）中，与平坦的普兰克$νplanck$νplanck$νm$ cdm cesmology（在哪些中，在哪个群众群体中，是一个自由群的总数），这是一个观察到的参数。为了敏感地测试SPT簇和Planck之间（DIS）一致的水平，需要进一步扩展的弱透镜随访样品。
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.
