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arXiv 2406.15344astro-ph.GA
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利用大巡天四重成像类星体透镜的无模型分析阐明星系族性质

Elucidating Galaxy Population Properties Using a Model-Free Analysis of Quadruply Imaged Quasar Lenses From Large Surveys

John Miller, Liliya L. R. Williams

AI总结:

本研究针对中等红移强透镜星系族性质不明的问题,提出基于四重透镜类星体像性质三维子空间的无模型分析技术,发现像性质距离度量$η$与星系性质距离度量$ζ$的明确关系,为利用未来大巡天样本估算星系族性质提供新途径。

摘要:

强透镜星系族是中等红移大质量星系的一个子集,其族群层面的性质目前尚未得到充分理解。在不久的将来,鲁宾天文台的空间与时间遗产巡天(LSST)和欧几里得(Euclid)等广域巡天预计将发现数千个多成像系统。考虑到即将获得的大样本四重透镜类星体(简称quads)可靠族群,我们提出了一种新技术来阐明星系族性质的经验分布。我们对主流强引力透镜分析进行了重新构想:不对单个透镜拟合质量模型,而是从多个星系族的参数化模型出发,这些模型包含了通常被忽略的质量分布复杂性,且目前暂不考虑外部剪切。我们构建了许多具有不同性质的模拟星系族,并从每个星系族中得到对应的四重透镜类星体族群。随后,我们基于可直接观测的四重透镜像性质的三维子空间,采用无模型分析,将模拟的“观测到的”四重透镜族群与各模拟样本的族群进行比较。两个四重透镜族群在像性质空间中的距离由度量$η$衡量,其母星系族群在星系性质空间中的距离由$ζ$衡量。我们发现$η$与$ζ$之间存在明确的关系。像性质空间与星系性质空间之间的这一发现的关系使得我们可以通过四重透镜的性质估计观测到的星系族性质,相关工作将在后续论文中开展。

英文摘要:

The population of strong lensing galaxies is a sub-set of intermediate-redshift massive galaxies, whose population-level properties are not yet well understood. In the near future, thousands of multiply imaged systems are expected to be discovered by wide-field surveys like Rubin Observatory's Legacy Survey of Space and Time (LSST) and Euclid. With the soon-to-be robust population of quadruply lensed quasars, or quads, in mind, we introduce a novel technique to elucidate the empirical distribution of the galaxy population properties. Our re-imagining of the prevailing strong lensing analysis does not fit mass models to individual lenses, but instead starts with parametric models of many galaxy populations, which include generally ignored mass distribution complexities and exclude external shear for now. We construct many mock galaxy populations with different properties and obtain populations of quads from each of them. The mock `observed' population of quads is then compared to those from the mocks using a model-free analysis based on a 3D sub-space of directly observable quad image properties. The distance between two quad populations in the space of image properties is measured by a metric $η$, and the distance between their parent galaxy populations in the space of galaxy properties is measured by $ζ$. We find a well defined relation between $η$ and $ζ$. The discovered relation between the space of image properties and the space of galaxy properties allows for the observed galaxy population properties to be estimated from the properties of their quads, which will be conducted in a future paper.

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。

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