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arXiv 2110.06232astro-ph.CO
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星系团强透镜宇宙学:来自规则星系团样本的宇宙学约束

Galaxy cluster strong lensing cosmography: cosmological constraints from a sample of regular galaxy clusters

G. B. Caminha, S. H. Suyu, C. Grillo, P. Rosati

摘要:

星团强透镜宇宙学是对宇宙背景几何学的一种很有前途的探索,由于使用空间和地面望远镜的观测质量提高,已经出现了几项研究。我们首次使用五个星团强透镜的样本来测量宇宙学参数的值,并将它们与经典探测器的结果相结合。为了评估强透镜宇宙学在约束宇宙背景几何中的简并性和有效性,我们采用了四种宇宙学场景。我们发现宇宙的总物质密度($Ω_{\rm m}$)和状态方程的暗能量参数$w$良好的约束力。对于一个平坦的$w$ CDM宇宙学,我们发现$Ω_{\rm m} = 0.30_{-0.11}^{+0.09}$和$w=-1.12_{-0.32}^{+0.17}$从强透镜。有趣的是,我们表明,从宇宙微波背景(CMB)的约束改善了2.5和4.0倍的$Ω_{\rm m}$和$w$,分别与我们的后验分布在这个宇宙学模型。在暗能量状态方程随红移演化的情况下,强透镜约束与宇宙学常数(即$w=-1$)相容。在弯曲宇宙学中,我们的强透镜分析可以容纳$Ω_{\rm k}=0.28_{-0.21}^{+0.16}$宇宙曲率的大范围值。在所有的宇宙学场景中,我们表明,我们的强透镜约束是互补的,并与CMB,重子声学振荡和Ia型超新星的测量结果很好地吻合。我们的研究结果表明,集群强透镜宇宙学是一个潜在的强大的探针,将包括在未来的调查宇宙学分析。

英文摘要:

Cluster strong lensing cosmography is a promising probe of the background geometry of the Universe and several studies have emerged, thanks to the increased quality of observations using space and ground-based telescopes. For the first time, we use a sample of five cluster strong lenses to measure the values of cosmological parameters and combine them with those from classical probes. In order to assess the degeneracies and the effectiveness of strong-lensing cosmography in constraining the background geometry of the Universe, we adopt four cosmological scenarios. We find good constraining power on the total matter density of the Universe ($Ω_{\rm m}$) and the equation of state of the dark energy parameter $w$. For a flat $w$CDM cosmology, we find $Ω_{\rm m} = 0.30_{-0.11}^{+0.09}$ and $w=-1.12_{-0.32}^{+0.17}$ from strong lensing only. Interestingly, we show that the constraints from the Cosmic Microwave Background (CMB) are improved by factors of 2.5 and 4.0 on $Ω_{\rm m}$ and $w$, respectively, when combined with our posterior distributions in this cosmological model. In a scenario where the equation of state of dark energy evolves with redshift, the strong lensing constraints are compatible with a cosmological constant (i.e. $w=-1$). In a curved cosmology, our strong lensing analyses can accommodate a large range of values for the curvature of the Universe of $Ω_{\rm k}=0.28_{-0.21}^{+0.16}$. In all cosmological scenarios, we show that our strong lensing constraints are complementary and in good agreement with measurements from the CMB, baryon acoustic oscillations and Type Ia supernovae. Our results show that cluster strong lensing cosmography is a potentially powerful probe to be included in the cosmological analyses of future surveys.

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