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New Constraints on Spatial Variations of the Fine Structure Constant from Clusters of Galaxies

Ebeling, Harald; Kocevski, Dale; Martins, Carlos J. A. P. +1 more

We have constrained the spatial variation of the fine structure constant using multi-frequency measurements of the thermal Sunyaev-Zeldovich effect of 618 X-ray selected clusters. Although our results are not competitive with the ones from quasar absorption lines, we improved by a factor 10 and ∼2.5 previous results from Cosmic Microwave Backgroun…