Further constraints on variation of the fine-structure constant from alkali-doublet QSO absorption lines

被引：115

作者：

Murphy, MT ^{[1
]}

Webb, JK

Flambaum, VV

Prochaska, JX

Wolfe, AM

机构：

[1] Univ New S Wales, Sch Phys, Sydney, NSW 2052, Australia

[2] Observ Carnegie Inst Washington, Pasadena, CA 91101 USA

[3] Univ Calif San Diego, Dept Phys, La Jolla, CA 92093 USA

[4] Univ Calif San Diego, Ctr Astrophys & Space Sci, La Jolla, CA 92093 USA

来源：

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | 2001年 / 327卷 / 04期

关键词：

atomic data; line : profiles; techniques : spectroscopic; quasars : absorption lines; ultraviolet : general;

D O I：

10.1046/j.1365-8711.2001.04842.x

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Comparison of quasar (QSO) absorption-line spectra with laboratory spectra provides a precise probe for variability of the fine-structure constant, alpha, over cosmological time-scales. We constrain variation in alpha in 21 Keck/HIRES Si IV absorption systems using the alkali-doublet (AD) method in which changes in a are related to changes in the doublet spacing. The precision obtained with the AD method has been increased by a factor of 3: Delta alpha/alpha = (-0.5 +/- 1.3) x 10(-5). We also analyse potential systematic errors in this result. Finally, we compare the AD method with the many-multiplet method, which has achieved an order of magnitude greater precision, and we discuss the future of the AD method.

引用

页码：1237 / 1243

页数：7

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