Possible evidence for a variable fine-structure constant from QSO absorption lines: systematic errors
Comparison of quasar (QSO) absorption spectra with laboratory spectra allows 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 c...
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| Veröffentlicht in: | Monthly notices of the Royal Astronomical Society 2001-11, Vol.327 (4), p.1223-1236 |
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| container_title | Monthly notices of the Royal Astronomical Society |
| container_volume | 327 |
| creator | Murphy, M.T. Webb, J.K. Flambaum, V.V. Churchill, C.W. Prochaska, J.X. |
| description | Comparison of quasar (QSO) absorption spectra with laboratory spectra allows 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, α, may have been smaller in the past: over the redshift range . 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 from zero becomes more significant. We are led increasingly to the interpretation that α was slightly smaller in the past. |
| doi_str_mv | 10.1046/j.1365-8711.2001.04841.x |
| format | Article |
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| ispartof | Monthly notices of the Royal Astronomical Society, 2001-11, Vol.327 (4), p.1223-1236 |
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| source | Wiley Online Library Journals Frontfile Complete; Oxford Journals Open Access Collection |
| subjects | atomic data instrumentation: spectrographs line: profiles methods: data analysis quasars: absorption lines techniques: spectroscopic |
| title | Possible evidence for a variable fine-structure constant from QSO absorption lines: systematic errors |
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