AI 中文总结
本研究通过结合约束宇宙学模拟与红移巡天数据重构速度场，校正巨脉泽数据的本动速度偏差，得出与CMB一致、与局域距离阶梯张力超2σ的H₀值，认为哈勃张力源于距离阶梯的系统误差而非新物理。
AI 中文摘要
巨脉泽（Megamaser）的距离测量无需使用传统的距离阶梯，因此可作为独立探针，用于测量由哈勃常数H₀量化的局域膨胀速率。我们重新分析巨脉泽的距离和红移数据，以获得新的、更精确的H₀估计值。本分析的主要改进之处在于采用了新的速度场重构方法，用于校正红移中的本动速度。该重构方法除了利用红移巡天数据外，还结合了约束宇宙学模拟，以更准确地捕捉相干流以及非高斯的单个星系运动。我们认为，以往基于巨脉泽数据得出的H₀估计值易受本动速度偏差的影响。通过使用这种新的重构方法校正本动运动后，我们得到的H₀值与宇宙微波背景（CMB）的测量值一致，且与局域距离阶梯测量值的张力超过2σ；而以往的结果显示其与距离阶梯测量值一致，且与CMB测量值的张力超过2σ。我们的结果表明，哈勃张力源于距离阶梯中迄今尚未确定的系统误差，而非新的物理机制。
英文摘要
Megamaser distances can be measured without using the traditional distance ladder. As such, they provide an independent probe of the local expansion rate, quantified by the Hubble constant $H_0$. We re-analyze megamaser distance and redshift data to obtain a new, more accurate, estimate of $H_0$. The main improvement in our analysis is the use of a new velocity field reconstruction to correct redshifts for peculiar velocities. This reconstruction utilizes constrained cosmological simulations in addition to redshift survey data to more accurately capture both coherent flows as well as nonGaussian individual galaxy motions. We argue that previous estimates of $H_0$ from megamaser data were susceptible to bias due to peculiar velocities. By correcting for peculiar motions using this new reconstruction we obtain a value of $H_0$ that is consistent with the value from the Cosmic Microwave Background (CMB) and in tension with the value from the local distance ladder at greater than a $2σ$ level, whereas previous results showed consistency with the distance ladder and tension with the CMB at greater than $2σ$. Our results suggest that the Hubble tension is due to some heretofore undetermined systematic in the distance ladder rather than new physics.
Comments5 pages, 3 figures, 2 tables
