标题： 与RCSLenS弱引力透镜交叉相关Planck tSZ：对宇宙学和活动星系核反馈的影响 显示英文标题

标题： Cross-correlating Planck tSZ with RCSLenS weak lensing: Implications for cosmology and AGN feedback

摘要： 我们通过普朗克卫星的热太阳亚夫-泽尔多维奇（tSZ）图与红序列星系团调查（RCSLenS）的弱引力透镜图之间的交叉相关性，展示了（热）重子物质与宇宙总物质之间的空间映射。 交叉相关性是在图层上进行的，所有源（包括弥散的星际气体）都对信号有贡献。 在我们的分析中，我们考虑了两种配置空间相关函数估计器，$\xi^{ y-\kappa}$和$\xi^ {y-\gamma_{t}}$，以及一种傅里叶空间估计器，$C_{\ell}^{y-\kappa}$。 我们在天空中三个度的角分离范围内检测到了显著的相关性。 仅基于统计噪声，我们可以分别使用配置空间的$y-\kappa$和$y-\gamma_{t}$估计器报告 13$\sigma$和 17$\sigma$次交叉相关性检测。 包括对抽样方差的启发式估计分别得到检测显著性为6$\sigma$和8$\sigma$。 从傅里叶空间估计器得到类似的检测水平，即$C_{\ell}^{y-\kappa}$。 由于每个估计器探测不同的动力学范围，它们的结合提高了检测的显著性。 我们将测量结果与cosmo-OWLS宇宙学流体动力学模拟套件的预测进行比较，在该套件中实现了不同的星系反馈模型。 我们发现，一个具有显著活动星系核反馈的模型，该模型从星系团中移除了大量热气体，并采用WMAP-7年最佳拟合宇宙学参数，与测量结果最为吻合。 在普朗克宇宙学背景下的所有重子模型都高估了观测信号。 当我们使用包含观测到的“普遍”压力轮廓的晕模型时，得出了类似的宇宙学结论。 显示英文摘要

摘要： We present measurements of the spatial mapping between (hot) baryons and the total matter in the Universe, via the cross-correlation between the thermal Sunyaev-Zeldovich (tSZ) map from Planck and the weak gravitational lensing maps from the Red Sequence Cluster Survey (RCSLenS). The cross-correlations are performed on the map level where all the sources (including diffuse intergalactic gas) contribute to the signal. We consider two configuration-space correlation function estimators, $\xi^{ y-\kappa}$ and $\xi^ {y-\gamma_{t}}$, and a Fourier space estimator, $C_{\ell}^{y-\kappa}$, in our analysis. We detect a significant correlation out to three degrees of angular separation on the sky. Based on statistical noise only, we can report 13$\sigma$ and 17$\sigma$ detections of the cross-correlation using the configuration-space $y-\kappa$ and $y-\gamma_{t}$ estimators, respectively. Including a heuristic estimate of the sampling variance yields a detection significance of 6$\sigma$ and 8$\sigma$, respectively. A similar level of detection is obtained from the Fourier-space estimator, $C_{\ell}^{y-\kappa}$. As each estimator probes different dynamical ranges, their combination improves the significance of the detection. We compare our measurements with predictions from the cosmo-OWLS suite of cosmological hydrodynamical simulations, where different galactic feedback models are implemented. We find that a model with considerable AGN feedback that removes large quantities of hot gas from galaxy groups and WMAP-7yr best-fit cosmological parameters provides the best match to the measurements. All baryonic models in the context of a Planck cosmology over-predict the observed signal. Similar cosmological conclusions are drawn when we employ a halo model with the observed `universal' pressure profile.