2005/11/28 by S. A. Levshakov, M. Centurion, M. Centurión +7 · 1 citation
Mathematics · Physics and Astronomy · #Alpha (finance) #Astronomy #Astronomy and Astrophysical Research #Astrophysics #Fine-structure constant #Galaxy #Mathematics #Nuclear physics #Oscillation (cell signaling) #Physics #Quantum mechanics #Redshift #Scientific Research and Discoveries #Spectral line #Spectrograph #Spectrum (functional analysis) #Statistics #Stellar, planetary, and galactic studies #Telescope #Very Large Telescope #astro-ph
paper · pdf · doi:10.1051/0004-6361:20053827
12 pages, 8 figures, 8 tables; accepted for publication in A&A
arxiv created 2005/11/28 · openalex publication_date 2006/03/24 · arxiv updated 2009/12/01 · openalex created_date 2019/06/27 · openalex updated_date 2026/08/05
<i>Aims.<i/>Verification the theoretical prediction of oscillation of the fine-structure constant over cosmic time requires high precision measurements at individual redshifts. In earlier studies the mean values averaged over wide redshift intervals were usually reported. This requirement can be met using the single ion differential <i>α<i/> measurement (SIDAM) procedure. We apply SIDAM to the lines associated with the damped Ly<i>α<i/> system observed at <i>z<i/><sub>abs<sub/> = 1.15 in the spectrum of HE 0515–4414. <i>Methods.<i/>The spectrum was obtained by means of the UV-Visual Echelle Spectrograph (UVES) at the ESO Very Large Telescope (VLT). <i>Results.<i/>The weighted mean calculated using carefully selected 34 pairs (, and 2586 Å) is ( C.L.). The precision of this estimate improves by a factor of 2 the previous one reported for the same system. The obtained result represents an absolute improvement with respect to what has been done in the measurements of .