论文标题
通过模拟量化CMB镜头衍生的星系群质量测量的统计数据
Quantifying the statistics of CMB-lensing-derived galaxy cluster mass measurements with simulations
论文作者
论文摘要
CMB镜头是一种测量可以使用的星系簇质量的新颖的新型方法，例如，用于在星系簇计数分析中进行质量校准。如果在随后的分析中使用它们不会导致偏差结果，那么了解使用此类测量获得的星系簇质量的统计数据至关重要。我们研究了可观察到的类似于普朗克的实验的CMB镜头星系簇质量的统计数据，并从N体模拟获得的模拟观察结果。我们量化了与可观察到的两种不同方法相关的偏差和固有散射，其中一种是隔离群集和附近相关的大规模结构引起的信号，而另一种由于不相关的大规模结构而引起的变化也被考虑了另一种。对于我们的第一种方法，我们还量化了散布中对数正态性的偏差，发现它们对我们的普朗克样实验产生了可忽略的质量校准影响。我们简要讨论了我们的一些结果如何改变具有较高角度分辨率和较低噪声水平的实验，例如使用地面大型伸缩望远镜获得的当前一代调查。
CMB lensing is a promising, novel way to measure galaxy cluster masses that can be used, e.g., for mass calibration in galaxy cluster counts analyses. Understanding the statistics of the galaxy cluster mass observable obtained with such measurements is essential if their use in subsequent analyses is not to lead to biased results. We study the statistics of a CMB lensing galaxy cluster mass observable for a Planck-like experiment with mock observations obtained from an N-body simulation. We quantify the bias and intrinsic scatter associated with this observable following two different approaches, one in which the signal due to the cluster and nearby correlated large-scale structure is isolated, and another one in which the variation due to uncorrelated large-scale structure is also taken into account. For our first approach we also quantify deviations from log-normality in the scatter, finding them to have a negligible impact on mass calibration for our Planck-like experiment. We briefly discuss how some of our results change for experiments with higher angular resolution and lower noise levels, such as the current generation of surveys obtained with ground-based, large-aperture telescopes.
