Constraining the Fine-Structure Constant at z ~ 2.5 using Emission Lines

Details Constraining the Fine-Structure Constant at z ~ 2.5 using Emission Lines Constraining the Fine-Structure Constant at z ~ 2.5 using Emission Lines

Nov 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004aipc..736..117b&link_type=abstract

PHI IN THE SKY: The Quest for Cosmological Scalar Fields. AIP Conference Proceedings, Volume 736, pp. 117-122 (2004).

Mathematics

Logic

3

Observational Cosmology, Intergalactic Matter, Quasar Absorption And Emission-Line Systems, Lyman Forest, Distances, Redshifts, Radial Velocities, Spatial Distribution Of Galaxies

Scientific paper

We present the first results from a dedicated survey with ISAAC on the Very Large Telescope (VLT) to constrain variations in the fine-structure constant α in the range 2 < z < 3 using the forbidden [O III] transitions at 4959Å and 5007Å, as pioneered at lower redshift by Bahcall et al. (2004). We describe our data analysis in detail and show that we can use the atmospheric OH lines to wavelength calibrate the spectra to very high accuracy. The resulting method gives useful constraints but further work remains to remove sources of systematic uncertainty.

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