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.