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arXiv 1104.2969astro-ph.COphysics.atom-ph
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来自两个独立望远镜的质子-电子质量比宇宙学变化的第一个约束

First constraint on cosmological variation of the proton-to-electron mass ratio from two independent telescopes

Freek van Weerdenburg, Michael T. Murphy, Adrian L. Malec, Lex Kaper, Wim Ubachs

摘要:

利用ESO甚大望远镜(Paranal,Chile)上的UVES光谱仪,沿明亮类星体源J2123 $-$ 005的视线,分析了一个高红移天体中包含最多氢谱线(90条H2谱线和6条HD谱线)的高信噪比光谱。这提供了对质子与电子质量比Dmu/mu =(8.5 \pm 3.6_{stat} \pm 2.2_{syst})× 10^{-6},红移z=2.059$,这与最近发表的在凯克望远镜上观察到的同一系统的结果吻合得很好,得出Dmu/mu =(5.6 \pm 5.5_{stat} \pm 2.9_{syst})x 10^{-6}。两种分析均使用相同的稳健吸收线拟合程序,并详细考虑了系统误差。

英文摘要:

A high signal-to-noise spectrum covering the largest number of hydrogen lines (90 H2 lines and 6 HD lines) in a high redshift object was analyzed from an observation along the sight-line to the bright quasar source J2123$-$005 with the UVES spectrograph on the ESO Very Large Telescope (Paranal, Chile). This delivers a constraint on a possible variation of the proton-to-electron mass ratio of Dmu/mu = (8.5 \pm 3.6_{stat} \pm 2.2_{syst}) x 10^{-6} at redshift z=2.059$, which agrees well with a recently published result on the same system observed at the Keck telescope yielding Dmu/mu = (5.6 \pm 5.5_{stat} \pm 2.9_{syst}) x 10^{-6}. Both analyses used the same robust absorption line fitting procedures with detailed consideration of systematic errors.

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