Cosmography with Supernova Refsdal through time-delay cluster lensing: independent measurements of the Hubble constant and geometry of the Universe
arxiv(2024)
摘要
We present new measurements of the values of the Hubble constant, matter
density, dark energy density, and dark energy density equation-of-state
parameters from a full strong lensing analysis of the observed positions of 89
multiple images and 4 measured time delays of SN Refsdal multiple images in the
Hubble Frontier Fields galaxy cluster MACS J1149.5+2223. By strictly following
the identical modelling methodology as in our previous work, that was done
before the time delays were available, our cosmographic measurements here are
essentially blind based on the frozen procedure. Without using any priors from
other cosmological experiments, in an open wCDM cosmological model, through
our reference cluster mass model, we measure the following values: H_0 =
65.1^+3.5_-3.4 km s^-1 Mpc^-1, Ω_
DE=0.76^+0.15_-0.10, and w=-0.92^+0.15_-0.21 (at the 68.3
confidence level). No other single cosmological probe is able to measure
simultaneously all these parameters. Remarkably, our estimated values of the
cosmological parameters, particularly H_0, are very robust and do not depend
significantly on the assumed cosmological model and the cluster mass modelling
details. The latter introduce systematic uncertainties on the values of H_0
and w which are found largely subdominant compared to the statistical errors.
The results of this study show that time delays in lens galaxy clusters,
combined with extensive photometric and spectroscopic information, offers a
novel and competitive cosmological tool.
更多查看译文
AI 理解论文
溯源树
样例
生成溯源树,研究论文发展脉络
Chat Paper
正在生成论文摘要