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arXiv 1004.1856astro-ph.COgr-qc
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哈勃常数

The Hubble Constant

Wendy L. Freedman, Barry F. Madore

摘要:

过去二十年来,在确定哈勃常数方面取得了相当大的进展。我们讨论的宇宙学背景和精确测量的哈勃常数的重要性,并专注于六个高精度的距离测定方法:造父变星,红巨星分支的尖端,脉泽星系,表面亮度波动,塔利-费舍尔关系和Ia型超新星。我们详细讨论了已知的系统误差在测量星系的距离,以及如何尽量减少他们。我们目前对哈勃常数的最佳估计是73 +/-2(随机)+/-4(系统)km/s/Mpc。随着旨在提高其他宇宙学参数精度的新任务和实验的开展,提高哈勃常数精度的重要性将在今后十年中增加。我们概述的步骤,将需要提供一个值的哈勃常数到2%的系统不确定性,并讨论其他宇宙学参数的约束,然后将有可能与这样的精度。

英文摘要:

Considerable progress has been made in determining the Hubble constant over the past two decades. We discuss the cosmological context and importance of an accurate measurement of the Hubble constant, and focus on six high-precision distance-determination methods: Cepheids, tip of the red giant branch, maser galaxies, surface brightness fluctuations, the Tully-Fisher relation and Type Ia supernovae. We discuss in detail known systematic errors in the measurement of galaxy distances and how to minimize them. Our best current estimate of the Hubble constant is 73 +/-2 (random) +/-4 (systematic) km/s/Mpc. The importance of improved accuracy in the Hubble constant will increase over the next decade with new missions and experiments designed to increase the precision in other cosmological parameters. We outline the steps that will be required to deliver a value of the Hubble constant to 2% systematic uncertainty and discuss the constraints on other cosmological parameters that will then be possible with such accuracy.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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