Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010ap%26ss.tmp..391t&link_type=abstract
Astrophysics and Space Science, Online First
Astronomy and Astrophysics
Astrophysics
Cosmology: Observations, Line: Profiles, Quasars: Emission Lines, Quasars
Scientific paper
A possible spatial and temporal dependence of the fine-structure constant α=e 2/(4π ɛ 0 ℏ c) was investigated. For this purpose, a statistical analysis of fine splitting of [OIII] doublet emission lines in SDSS (Sloan Digital Sky Survey) quasar spectra is carried out in order to estimate a possible time variation of the fine-structure constant (α) over cosmological time scales t˜1010 yr. After a careful selection of pairs of lines, the Thong method with a derived analytical expression for the error analysis was applied to compute the α variation. We report a new constraint on the variation of the α based on the analysis of 42 [OIII] doublets selected from SDSS quasar sample. We find Δα/α=(-0.52±0.77)×10-5 over a redshift range 0.16≤z≤0.80. This result represents a factor of ˜14 improvements on the constraint on Δα/α based on [OIII] doublets compared to the published results in the literature.
Bang Ha Huy
Duc Thong Le
Hung Tran Van
Thi Thu Huong Nguyen
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