Impact of instrumental systematic errors on fine-structure constant measurements with quasar spectra
نویسندگان
چکیده
منابع مشابه
On variations in the fine-structure constant and limits on AGB pollution of quasar absorption systems
At redshifts zabs . 2, quasar absorption-line constraints on space-time variations in the fine-structure constant, α, rely on the comparison of Mg and Fe transition wavelengths. One potentially important uncertainty is the relative abundance of Mg isotopes in the absorbers which, if different from solar, can cause spurious shifts in the measured wavelengths and, therefore, α. Here we expl...
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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, α, may have been smaller in the past: ∆α/α = (−0.72 ± 0.18) × 10 over the redshift range 0.5 < ...
متن کاملOn variations in the fine-structure constant and stellar pollution of quasar absorption systems
At redshifts zabs . 2, quasar absorption-line constraints on space-time variations in the fine-structure constant, α, rely on the comparison of Mg and Fe transition wavelengths. One potentially important uncertainty is the relative abundance of Mg isotopes in the absorbers which, if different from solar, can cause spurious shifts in the measured wavelengths and, therefore, α. Here we expl...
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We report results from a third sample of quasar absorption line spectra from the Keck telescope which has been studied to search for any possible variation of the fine structure constant, α. This third sample, which is larger than the sum of the two previously published samples, shows the same effect, and also gives, as do the previous two samples, a significant result. The combined sample yiel...
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We propose a new probe of the dependence of the fine-structure constant α on a strong gravitational field using metal lines in the spectra of white-dwarf stars. Comparison of laboratory spectra with far-UV astronomical spectra from the white-dwarf star G191-B2B recorded by the Hubble Space Telescope Imaging Spectrograph gives limits of Δα/α=(4.2±1.6)×10(-5) and (-6.1±5.8)×10(-5) from FeV and Ni...
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ژورنال
عنوان ژورنال: Monthly Notices of the Royal Astronomical Society
سال: 2014
ISSN: 0035-8711,1365-2966
DOI: 10.1093/mnras/stu2420