Analysing the large-scale bulk flow using cosmicflows4: increasing tension with the standard cosmological model
Analysing the large-scale bulk flow using cosmicflows4: increasing tension with the standard cosmological model
复制标题
使用 cosmicflows4 分析大规模整体流：使用标准宇宙学模型增加张力
DOI：
10.1093/mnras/stad1984
复制
发表时间：
2023
影响因子：
4.8
通讯作者：
Tully, R. Brent
中科院分区：
文献类型：
--
作者：
Watkins, Richard;Allen, Trey;Bradford, Collin James;Ramon, Jr, Albert;Walker, Alexandra;Feldman, Hume A.;Cionitti, Rachel;Al-Shorman, Yara;Kourkchi, Ehsan;Tully, R. Brent
我们用最小方差方法对半径为150 - 200 h-1 Mpc的体积内的整体流进行了估算，数据来自宇宙流-4（CF 4）星表。在CF 4中增加的新数据导致了相对于宇宙流-3（CF 3），半径为150 h− 1 Mpc的球体中的整体流的估计增加。在具有宇宙微波背景辐射导出参数的标准宇宙学模型中，这种整体流动有可能发生。鉴于CF 4比CF 3更深，我们首次能够使用CF 4准确估计200 h-1 Mpc尺度上的整体流（对于哈勃常数H 0 = 75 km s-1 Mpc-1，相当于266 Mpc）。这种大规模的流动与标准模型的张力更大，有发生的可能性。为了准确地估计整体流量，我们引入了一种新的方法来计算距离和速度的距离模量是无偏的，在所有距离准确。我们的结果与H 0的值完全无关。
We present an estimate of the bulk flow in a volume of radii 150−200 h−1Mpc using the minimum variance method with data from theCosmicFlows-4(CF4) catalogue. The addition of new data in the CF4 has resulted in an increase in the estimate of the bulk flow in a sphere of radius 150 h−1Mpc relative to theCosmicFlows-3(CF3). This bulk flow has anchance of occurring in the standard cosmological model with cosmic microwave background derived parameters. Given that the CF4 is deeper than the CF3, we were able to use the CF4 to accurately estimate the bulk flow on scales of 200 h−1Mpc (equivalent to 266 Mpc for Hubble constantH0= 75 km s−1Mpc−1) for the first time. This bulk flow is in even greater tension with the standard model, havingprobability of occurring. To estimate the bulk flow accurately, we introduce a novel method to calculate distances and velocities from distance moduli that is unbiased and accurate at all distances. Our results are completely independent of the value ofH0.