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arXiv 2007.14398astro-ph.CO
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八个时滞星系透镜的哈勃常数

The Hubble constant from eight time-delay galaxy lenses

Philipp Denzel, Jonathan P. Coles, Prasenjit Saha, Liliya L. R. Williams

摘要:

我们提出了一个确定的哈勃常数的联合,自由形式的分析,8强,四倍透镜系统。在和谐宇宙学中,我们找到了精确度为$4.97\%$的$H_0 = 71.8^{+3.9}_{-3.3}\,\mathrm{km}\,\mathrm{s}^{-1}\,\mathrm{Mpc}^{-1}$。这与Ia型超新星和普朗克观测的宇宙微波背景的最新测量结果一致。我们的精度较低,这些和其他最近的时间延迟宇宙学测定相比,因为我们的建模策略反映了系统的不确定性透镜退化。此外,我们能够找到合理的透镜图像重建约束的$H_0$的本地和早期宇宙测量值。这使我们得出结论,目前对$H_0$的透镜约束还不足以打破宇宙学的“哈勃张力”问题。

英文摘要:

We present a determination of the Hubble constant from the joint, free-form analysis of 8 strongly, quadruply lensing systems. In the concordance cosmology, we find $H_0 = 71.8^{+3.9}_{-3.3}\,\mathrm{km}\,\mathrm{s}^{-1}\,\mathrm{Mpc}^{-1}$ with a precision of $4.97\%$. This is in agreement with the latest measurements from Supernovae Type Ia and Planck observations of the cosmic microwave background. Our precision is lower compared to these and other recent time-delay cosmography determinations, because our modelling strategies reflect the systematic uncertainties of lensing degeneracies. We furthermore are able to find reasonable lensed image reconstructions by constraining to either value of $H_0$ from local and early Universe measurements. This leads us to conclude that current lensing constraints on $H_0$ are not strong enough to break the "Hubble tension" problem of cosmology.

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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