改进NASA/IPAC河外星系数据库的红移计算
Improving NASA/IPAC Extragalactic Database Redshift Calculations
摘要：
NASA/IPAC河外星系数据库（NED）是一个令人印象深刻的工具，可以找到数百万天体的近乎详尽的信息。在这里，我们概述了一个小的系统误差，发生在NED，因为低红移近似时，使用的校正从红移在日心坐标系的宇宙微波背景（CMB）休息帧。这意味着NED在历史上系统性地误报了CMB框架的红移值，最高可达$\sim10^{-3}z$（红移为1时约为0.001）。这是一个系统误差，因此对需要精确红移的应用的影响可能是显著的-例如，在低红移时$\sim10^{-4}$的系统红移误差可以解决哈勃张力。我们已经咨询了NED团队，他们正在更新软件以消除这种系统误差，因此这些修正在所有红移处都是准确的。在这里，我们解释了这些变化以及它们如何影响NED目前报告的红移值。
英文摘要：
The NASA/IPAC Extragalactic Database (NED) is an impressive tool for finding near-exhaustive information on millions of astrophysical objects. Here, we outline a small systematic error that occurs in NED because a low-redshift approximation is used when making the correction from redshifts in the heliocentric frame to the cosmic microwave background (CMB) rest frame. It means that historically NED systematically misreported the values of CMB-frame redshifts by up to $\sim10^{-3}z$ (about 0.001 at redshift of 1). This is a systematic error, and therefore the impact on applications requiring precise redshifts has the potential to be significant -- for example, a systematic redshift error of $\sim10^{-4}$ at low redshift could resolve the Hubble tension. We have consulted with the NED team and they are updating the software to remove this systematic error so these corrections are accurate at all redshifts. Here, we explain the changes and how they impact the redshift values NED currently reports.
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