Wavelengths of [Fe II] from quasar J110325-264515 for a study of space-time variations in the fine-structure constant

We report a new stringent limit relating to the space-time variation in the fine-structure constant α=e24πε0ℏc from an analysis of quasar J110325-264515 towards zabs=1.8389. We find Δα/α=(1.56±1.78)×10-6 from a comparison of laboratory wavelengths of [Fe II] with those found in quasar spectra. The obtained result proposes how inferred measurements of cosmic can improve these limits in the future and can also constrain space-time variations.