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arXiv 1911.02101astro-ph.COastro-ph.GA
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哈勃前沿场中视线Galerkin效应对放大率的影响

Exploring Effects on Magnifications due to Line-of-Sight Galaxies in the Hubble Frontier Fields

Catie A. Raney, Charles R. Keeton, Sean Brennan

摘要:

由于星系团透镜具有放大光源的能力,它已成为寻找高红移星系的重要工具。为了确定这些星系的内在性质,必须建立透镜质量模型来确定图像的放大率。这些模型传统上是二维的,集中在星系团内的质量,忽略或近似任何来自视线星系的贡献。在本文中,我们提出了第一套完整的三维质量模型的六个哈勃前沿领域,并使用它们来测试系统的偏差,由于使用传统的二维方法放大。我们发现,忽略前景或背景星系会导致图像位置偏移在0.1-0.4”之间,这是当前最先进模型的典型0.3-0.7”残差的不可忽略的一部分。我们还发现,中值图像放大率可以移动高达6%,虽然它是依赖于字段。这在某些情况下可以通过近似透镜平面中的质量来缓解,但在其他情况下仍然存在5%的放大率偏差;图像位置偏移也得到改善,但仍然存在0.10”。

英文摘要:

Cluster lensing has become an important tool in the search for high redshift galaxies through its ability to magnify sources. In order to determine the intrinsic properties of these galaxies, lensing mass models must be constructed to determine the magnification of the images. These models are traditionally two-dimensional, focusing on the mass within the cluster and either ignoring or approximating any contribution from line-of-sight galaxies. In this paper, we present the first full set of three-dimensional mass models of the six Hubble Frontier Fields and use them to test for systematic biases in magnifications due to using the traditional 2D approach. We find that omitting foreground or background galaxies causes image position offsets between 0.1-0.4", a non-negligible fraction of the typical 0.3-0.7" residuals of current state-of-the-art models. We also find that median image magnifications can shift by up to 6%, though it is dependent on the field. This can be alleviated in some cases by approximating the mass in the lensing plane, but a 5% magnification bias still exists in other cases; image position offsets are also improved, but are still present at 0.10".

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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