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Article overview
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Possible evidence for a variable fine structure constant from QSO absorption lines: systematic errors | M. T. Murphy
; J. K. Webb
; V. V. Flambaum
; C. W. Churchill
; J. X. Prochaska
; | Date: |
20 Dec 2000 | Journal: | Mon.Not.Roy.Astron.Soc. 327 (2001) 1223 | Subject: | astro-ph | Affiliation: | UNSW), J. K. Webb (UNSW), V. V. Flambaum (UNSW), C. W. Churchill (PSU), J. X. Prochaska (OCIW | Abstract: | Comparison of quasar absorption spectra with laboratory spectra allow us to probe possible variations in the fundamental constants over cosmological time-scales. In a companion paper we present an analysis of Keck/HIRES spectra and report possible evidence suggesting that the fine structure constant, alpha, may have been smaller in the past: da/a = (-0.72 +/- 0.18) * 10^{-5} over the redshift range 0.5 < z < 3.5. In this paper we describe a comprehensive investigation into possible systematic effects. Most of these do not significantly influence our results. When we correct for those which do produce a significant systematic effect in the data, the deviation of da/a from zero becomes more significant. We are lead increasingly to the interpretation that alpha was slightly smaller in the past. | Source: | arXiv, astro-ph/0012420 | Services: | Forum | Review | PDF | Favorites |
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