探测星系团的质量子结构：引力子的孔径质量统计
Detecting Mass Substructure in Galaxy Clusters: An Aperture Mass Statistic for Gravitational Flexion
摘要：
引力弯曲最近被引入作为一种技术，人们可以通过它来绘制和研究星系团的子结构。以前的分析涉及弯曲测量个别星系星系弯曲信号，或使用参数技术或KSB型反演重建的质量分布在阿贝尔1689。在本文中，我们提出了一个光圈质量统计弯曲，并将其应用到通过光线跟踪模拟通过一个简单的分析质量分布，并通过一个星系团从千年模拟获得的背景星系的透镜图像。我们表明，这种方法是有效的检测和准确跟踪结构的星系团内的亚弧分尺度上的高信噪比，即使使用一个温和的背景源数密度和图像分辨率。此外，该方法提供了更多的信息的整体形状和小尺度结构的星系团比可以实现通过弱透镜质量重建使用引力剪切数据。最后，我们讨论了如何零点的孔径质量可能被用来推断质量的结构，确定使用这种方法。
英文摘要：
Gravitational flexion has recently been introduced as a technique by which one can map out and study substructure in clusters of galaxies. Previous analyses involving flexion have measured the individual galaxy-galaxy flexion signal, or used either parametric techniques or a KSB-type inversion to reconstruct the mass distribution in Abell 1689. In this paper, we present an aperture mass statistic for flexion, and apply it to the lensed images of background galaxies obtained by ray-tracing simulations through a simple analytic mass distribution and through a galaxy cluster from the Millennium simulation. We show that this method is effective at detecting and accurately tracing structure within clusters of galaxies on sub-arcminute scales with high signal-to-noise even using a moderate background source number density and image resolution. In addition, the method provides much more information about both the overall shape and the small-scale structure of a cluster of galaxies than can be achieved through a weak lensing mass reconstruction using gravitational shear data. Lastly, we discuss how the zero-points of the aperture mass might be used to infer the masses of structures identified using this method.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
