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arXiv 1711.00829astro-ph.CO
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星系团中强透镜模拟作为检验宇宙学的一种有前途的方法。参数化暗能量模型

Strong lensing modeling in galaxy clusters as a promising method to test cosmography I. Parametric dark energy models

Juan Magana, Ana Acebron, Veronica Motta, Tomas Verdugo, Eric Jullo, Marceau Limousin

摘要:

在本文中,我们探讨五个宇宙学模型的暗能量状态方程参数,$w(z)$,参数化的红移使用强透镜数据在星系团阿贝尔1689。我们约束的$w(z)$功能的参数,通过重建透镜模型下的每一个这些宇宙学与强透镜测量两个星系团:阿贝尔1689和模拟集群,战神,从哈勃前沿领域比较挑战,以验证我们的方法。为了量化宇宙学约束如何由于强透镜建模中的系统效应而产生偏差,我们进行了三次运行,考虑了多个图像位置的以下不确定性:0.25”,0.5”和1.0”。与战神,我们发现,较大的误差减少了估计的宇宙学参数的系统偏差。用真实的数据,我们对$w(z)$的强透镜约束是一致的,来自其他宇宙学探测。我们确认,强透镜宇宙学与星系团是一个很有前途的方法来约束$w(z)$参数化。然而,需要更好地了解星系团及其环境,以改善SL建模,从而估计严格的宇宙学参数的替代宇宙学。

英文摘要:

In this paper we probe five cosmological models for which the dark energy equation of state parameter, $w(z)$, is parameterized as a function of redshift using strong lensing data in the galaxy cluster Abell 1689. We constrain the parameters of the $w(z)$ functions by reconstructing the lens model under each one of these cosmologies with strong lensing measurements from two galaxy clusters: Abell 1689 and a mock cluster, Ares, from the Hubble Frontier Fields Comparison Challenge, to validate our methodology. To quantify how the cosmological constraints are biased due to systematic effects in the strong lensing modeling, we carry out three runs considering the following uncertainties for the multiple images positions: 0.25", 0.5", and 1.0". With Ares, we find that larger errors decrease the systematic bias on the estimated cosmological parameters. With real data, our strong-lensing constraints on $w(z)$ are consistent those derived from other cosmological probes. We confirm that strong lensing cosmography with galaxy clusters is a promising method to constrain $w(z)$ parameterizations. A better understanding of galaxy clusters and their environment is however needed to improve the SL modeling and hence to estimate stringent cosmological parameters in alternatives cosmologies.

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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