当前位置: X-MOL 学术Astron. Astrophys. › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Cosmography with supernova Refsdal through time-delay cluster lensing: Independent measurements of the Hubble constant and geometry of the Universe
Astronomy & Astrophysics ( IF 6.5 ) Pub Date : 2024-04-24 , DOI: 10.1051/0004-6361/202449278
C. Grillo , L. Pagano , P. Rosati , S.H. Suyu

We present new measurements of the values of the Hubble constant, matter density, dark energy density, and dark energy density equation-of-state (EoS) parameters. These results have been obtained from a full strong-lensing analysis of the observed positions of 89 multiple images and 4 measured time delays of the supernova (SN) Refsdal in the Hubble Frontier Fields galaxy cluster MACS J1149.5+2223. By strictly following the identical modelling methodology (as done in our previous work undertaken before time delays were available), our cosmographic measurements are essentially blind, based on the frozen procedure. Without using any priors from other cosmological experiments, in an open wCDM cosmological model and via our reference cluster mass model, we measure the following values: km s−1 Mpc−1, , and (at the 68.3% confidence level). No other single cosmological probe has been able to simultaneously measure all these parameters. Remarkably, our estimated values of the cosmological parameters, in particular that of H0, are very robust and do not significantly depend on the assumed cosmological model or the cluster mass modelling details. The latter aspect introduces systematic uncertainties on the values of H0 and w, which are found to be largely subdominant compared to the statistical errors. The results of this study demonstrate that the combination of time delays in lens galaxy clusters with extensive photometric and spectroscopic information offers a novel and competitive cosmological tool.

中文翻译:

通过延时星团透镜进行超新星雷夫斯达尔的宇宙学:哈勃常数和宇宙几何的独立测量

我们提出了哈勃常数、物质密度、暗能量密度和暗能量密度状态方程(EoS)参数值的新测量结果。这些结果是通过对哈勃前沿场星系团 MACS J1149.5+2223中超新星 (SN) Refsdal 的 89 个多重图像和 4 个测量时间延迟的观测位置进行全面强透镜分析而获得的。通过严格遵循相同的建模方法(正如我们在时间延迟可用之前进行的先前工作中所做的那样),我们的宇宙学测量基本上是基于冻结程序的盲目测量。在不使用其他宇宙学实验的任何先验的情况下,在开放的w CDM 宇宙学模型中并通过我们的参考星团质量模型,我们测量了以下值:km s −1 Mpc −1 、 、 和 (置信度为 68.3%)。没有任何其他单一宇宙学探测器能够同时测量所有这些参数。值得注意的是,我们对宇宙学参数的估计值,特别是H 0的估计值非常稳健,并且并不显着依赖于假设的宇宙学模型或星团质量建模细节。后一个方面引入了H 0w值的系统不确定性,与统计误差相比,系统不确定性在很大程度上是次要的。这项研究的结果表明,透镜星系团中的时间延迟与广泛的光度和光谱信息的结合提供了一种新颖且有竞争力的宇宙学工具。
更新日期:2024-04-25
down
wechat
bug