Further evidence for a variable fine-structure constant from Keck/HIRES QSO absorption spectra

@article{Murphy2003FurtherEF,
  title={Further evidence for a variable fine-structure constant from Keck/HIRES QSO absorption spectra},
  author={Michael T. Murphy and John K Webb and Victor V. Flambaum},
  journal={Monthly Notices of the Royal Astronomical Society},
  year={2003},
  volume={345},
  pages={609-638}
}
We have previously presented evidence for a varying fine-str ucture constant, α, in two independent samples of Keck/HIRES QSO absorption spectra. Here we present a detailed manymultiplet analysis of a third Keck/HIRES sample containing 78 absorption systems. We also re-analyse the previous samples, providing a total of 128 absorption systems over the redshift range 0.2 < zabs < 3.7. The results, with raw statistical errors, indicate a small er weighted mean α in the absorption clouds… 

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References

SHOWING 1-10 OF 127 REFERENCES

Possible evidence for a variable fine structure constant from QSO absorption lines: Motivations, analysis and results

An experimental search for variation in the fundamental coupling constants is strongly motivated by modern high-energy physics theories. Comparison of quasar absorption line spectra with laboratory

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

The Lyα Forest at z ~ 4: Keck HIRES Observations of Q0000–26

We derive H I column density and Doppler width distributions for a sample of Lyα clouds with 3.4 < z <4.0, using a high-resolution spectrum of the quasar Q0000–26 (zem = 4.127) obtained with the Keck

Further evidence for cosmological evolution of the fine structure constant.

TLDR
The results of a search for time variability of the fine structure constant alpha using absorption systems in the spectra of distant quasars find no systematic effects which can explain the results.

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

Comparison of quasar (QSO) absorption-line spectra with laboratory spectra provides a precise probe for variability of the fine-structure constant, α, over cosmological time-scales. We constrain

Improved constraints on possible variation of physical constants from H i 21‐cm and molecular QSO absorption lines

Quasar (QSO) absorption spectra provide an extremely useful probe of possible cosmological variation in various physical constants. Comparison of H i 21-cm absorption with corresponding molecular

The Lyman-alpha forest and heavy-element systems of GB1759+7539

We present observations of the high-redshift QSO GB1759+7539 (zem=3.05) obtained with HIRES on the 10-m Keck telescope. The spectrum has a resolution of FWHM=7 km s-1, and a typical signal-to-noise

Low- and High-Ionization Absorption Properties of Mg II Absorption-selected Galaxies at Intermediate Redshifts. I. General Properties

We present extensive metal-line absorption properties for 45 absorption systems that were selected by their Mg II absorption at redshifts between 0.4 and 1.4. For each system the properties of

Discovery of DampedLyα Systems at Redshifts Less than 1.65 and Results on Their Incidence and Cosmological Mass Density

We present results from an efficient, nontraditional survey to discover damped Lyα (DLA) absorption systems with neutral hydrogen column densities N ≥ 2 × 1020 atoms cm-2 and redshifts z < 1.65. In

Ionized Gas in Damped Lyα Protogalaxies. I. Model-independent Inferences from Kinematic Data

We investigate the kinematics of ionized and neutral gas in a sample of 35 damped Lyα systems (protogalaxies) using accurate quasar spectra obtained with HIRES, the echelle spectrograph on the Keck I
...