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Recent studies of lensing clusters reveal that it might be fairly common for a galaxy cluster that the X‐ray centre has an obvious offset from its gravitational centre which is measured by strong lensing. We argue that if these offsets exist, then X‐rays and lensing are indeed measuring different regions of a cluster, and may thus naturally result in a discrepancy in the measured gravitational masses by the two different methods. Here we investigate theoretically the dynamical effects of such lensing–X‐ray offsets and compare with observational data. We find that for typical values, the offset alone can give rise to a factor of 2 difference between the lensing and X‐ray‐determined masses for the core regions of a cluster, suggesting that such ‘offset effect’ may play an important role and should not be ignored in our dynamical measurements of clusters.

Mass discrepancy in galaxy clusters as a result of the offset between dark matter and baryon distributions