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Understanding the formation history of brightest cluster galaxies is animportant topic in galaxy formation. Utilizing the Planck Sunyaev-Zel'dovichcluster catalog, and applying the Ansatz that the most massive halos at oneredshift remain among the most massive ones at a slightly later cosmic epoch,we have constructed cluster samples at redshift z~0.4 and z~0.2 that can bestatistically regarded as progenitor-descendant pairs. This allows us to studythe stellar mass assembly history of BCGs in these massive clusters at latetimes, finding the degree of growth between the two epochs is likely at onlyfew percent level, which is far lower compared to the prediction from astate-of-the-art semi-analytic galaxy formation model.

Stellar Mass Assembly of Brightest Cluster Galaxies at Late Times