论文标题
通过$ z \ gtrsim1 $从SPT-SZ调查中的HST弱透镜测量值扩展到SZ-Mass缩放关系的经验约束至较高的红移。
Extending empirical constraints on the SZ-mass scaling relation to higher redshifts via HST weak lensing measurements of nine clusters from the SPT-SZ survey at $z\gtrsim1$
论文作者
论文摘要
我们提出了一项哈勃太空望远镜（HST）弱重力透镜研究，对带有红移$ 1.0 \ Lessim Z \ Lessim Z \ Lessim 1.7 $ 1.7 $（$ Z_ \ MATHRM {MATHRM {MATHRM {MATHRM {中间} = 1.4 $）和Sunyaev Zel'dovich $ $ $ $ $ 6. 0. 0. 0. 0. 0. 0. 0. 0. 0. 0. 0. 0. 0. 0. 0. 0. 0. 0. 0. 0. 0. 0. 0. 0. 0. 0. 0. 0. 0. 0. 0.0 $ 6.0. Zel'Dovich（SPT-SZ）调查。我们测量了HST/ACS F606W和F814W图像中的弱透镜星系形状，并使用了F110W中的HST/WFC3的其他观察结果，在$ U_ \ Mathrm {high} $中的VLT/fors2中，在$ \ gtrsim in $ z \ gtrsim in $ \ gtrsim in $ \ gtrsim in $ \ gtrsim in paraxies中均具有高度的高度纯度。我们结合了来自Candels/3D-HST和HUDF字段的最新红移估计值，以推断源红移分布的改进估计。我们通过将切向减少的剪切曲线与球形Navarro-Frenk-White（NFW）模型拟合，测量了弱透镜质量。我们在样品中获得了群集SPT-CLJ2040 $ - $ 4451的样品中最大的镜头质量，从而确认了早期结果，与X射线和SZ质量测量相比，该群集的高透镜质量很高。将我们的弱透镜质量约束与先前针对较低红移簇的研究获得的结果相结合，我们扩大了无偏的SZ检测显着性$ζ$与SPT-SZ调查的群集质量之间的缩放关系校准，以至于较高的红移。我们发现，从我们最高的红移垃圾箱推断出的质量量表（$ 1.2 <z <1.7 $）与推断从较低的红移得出的约束的外推一致，尽管具有较大的统计不确定性。因此，我们的结果显示出与以前的研究相似的趋势，在较弱的镜头数据中得出的群集质量量表低于普朗克$νλ$ CDM中预期的质量尺度（即$ν$ $ $ $ $ $ $ c $ Cold Dark Matter）宇宙学鉴于SPT-SZ群集数量计数。
We present a Hubble Space Telescope (HST) weak gravitational lensing study of nine distant and massive galaxy clusters with redshifts $1.0 \lesssim z \lesssim 1.7$ ($z_\mathrm{median} = 1.4$) and Sunyaev Zel'dovich (SZ) detection significance $ξ> 6.0$ from the South Pole Telescope Sunyaev Zel'dovich (SPT-SZ) survey. We measured weak lensing galaxy shapes in HST/ACS F606W and F814W images and used additional observations from HST/WFC3 in F110W and VLT/FORS2 in $U_\mathrm{HIGH}$ to preferentially select background galaxies at $z\gtrsim 1.8$, achieving a high purity. We combined recent redshift estimates from the CANDELS/3D-HST and HUDF fields to infer an improved estimate of the source redshift distribution. We measured weak lensing masses by fitting the tangential reduced shear profiles with spherical Navarro-Frenk-White (NFW) models. We obtained the largest lensing mass in our sample for the cluster SPT-CLJ2040$-$4451, thereby confirming earlier results that suggest a high lensing mass of this cluster compared to X-ray and SZ mass measurements. Combining our weak lensing mass constraints with results obtained by previous studies for lower redshift clusters, we extended the calibration of the scaling relation between the unbiased SZ detection significance $ζ$ and the cluster mass for the SPT-SZ survey out to higher redshifts. We found that the mass scale inferred from our highest redshift bin ($1.2 < z < 1.7$) is consistent with an extrapolation of constraints derived from lower redshifts, albeit with large statistical uncertainties. Thus, our results show a similar tendency as found in previous studies, where the cluster mass scale derived from the weak lensing data is lower than the mass scale expected in a Planck $νΛ$CDM (i.e. $ν$ $Λ$ Cold Dark Matter) cosmology given the SPT-SZ cluster number counts.
