论文标题
Megamaser宇宙学项目。十三。组合哈勃恒定约束
The Megamaser Cosmology Project. XIII. Combined Hubble constant constraints
论文作者
论文摘要
我们介绍了使用几何距离测量值制成的哈勃常数对大型托管星系的测量。我们采用了一种改进的方法来拟合MASER数据，并获得了先前由Megamaser宇宙学项目发布的四个星系：UGC 3789，NGC 6264，NGC 6323和NGC 6323和NGC 5765b。 Combining these updated distance measurements with those for the maser galaxies CGCG 074-064 and NGC 4258, and assuming a fixed velocity uncertainty of 250 km s$^{-1}$ associated with peculiar motions, we constrain the Hubble constant to be $H_0 = 73.9 \pm 3.0$ km s$^{-1}$ mpc $^{ - 1} $独立于距离梯子和宇宙微波背景。这种最佳价值仅依赖于基于MASER的距离和速度测量值，并且不使用任何特殊的速度校正。校正特殊速度的不同方法不会将$ H_0 $修改超过$ {\ pm}1σ$，其中一系列最佳拟合哈勃恒定恒定值跨度为71.8-76.9 km S $^{ - 1} $ MPC $ MPC $^{ - 1} $。我们证实了先前的迹象，即$ h_0 $的本地价值超过了早期的价值，置信度水平从95-99％的特殊速度处理的95-99％不等。
We present a measurement of the Hubble constant made using geometric distance measurements to megamaser-hosting galaxies. We have applied an improved approach for fitting maser data and obtained better distance estimates for four galaxies previously published by the Megamaser Cosmology Project: UGC 3789, NGC 6264, NGC 6323, and NGC 5765b. Combining these updated distance measurements with those for the maser galaxies CGCG 074-064 and NGC 4258, and assuming a fixed velocity uncertainty of 250 km s$^{-1}$ associated with peculiar motions, we constrain the Hubble constant to be $H_0 = 73.9 \pm 3.0$ km s$^{-1}$ Mpc$^{-1}$ independent of distance ladders and the cosmic microwave background. This best value relies solely on maser-based distance and velocity measurements, and it does not use any peculiar velocity corrections. Different approaches for correcting peculiar velocities do not modify $H_0$ by more than ${\pm}1σ$, with the full range of best-fit Hubble constant values spanning 71.8-76.9 km s$^{-1}$ Mpc$^{-1}$. We corroborate prior indications that the local value of $H_0$ exceeds the early-Universe value, with a confidence level varying from 95-99% for different treatments of the peculiar velocities.
