Wangzheng Zhang, Ming-chung Chu, Shihong Liao, Shek Yeung and Hui-Jie Hu
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引用次数: 0
摘要
哈勃常数H0，宇宙当前的膨胀速率，是宇宙学中最重要的参数之一。由于引力作用，宇宙膨胀调节着一对天体相互接近的运动。因此，量化天体相对运动的平均对偶奇异速度对H0和无因次总物质密度Ωm都很敏感。在此基础上，利用Cosmicflows-4数据，我们首次在非线性和准线性范围内通过星系对向速度测量了H0。我们的结果得到H0 = 75.5±1.4 km s−1 Mpc−1和。如果将来统计误差可以忽略不计，H0和Ωm的不确定性可以分别提高到0.6%和2%左右。
Measuring the Hubble Constant through the Galaxy Pairwise Peculiar Velocity
The Hubble constant H0, the current expansion rate of the Universe, is one of the most important parameters in cosmology. The cosmic expansion regulates the mutually approaching motion of a pair of celestial objects due to their gravity. Therefore, the mean pairwise peculiar velocity of celestial objects, which quantifies their relative motion, is sensitive to both H0 and the dimensionless total matter density Ωm. Based on this, using the Cosmicflows-4 data, we measured H0 for the first time via the galaxy pairwise velocity in the nonlinear and quasi-linear range. Our results yield H0 = 75.5 ± 1.4 km s−1 Mpc−1 and . The uncertainties of H0 and Ωm can be improved to around 0.6% and 2%, respectively, if the statistical errors become negligible in the future.
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