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We present the MAssive ClusterS and Intercluster Structures (MACSIS) project,a suite of 390 clusters simulated with baryonic physics that yields realisticmassive galaxy clusters capable of matching a wide range of observedproperties. MACSIS extends the recent BAHAMAS simulation to higher masses,enabling robust predictions for the redshift evolution of cluster propertiesand an assessment of the effect of selecting only the hottest systems. We studythe observable-mass scaling relations and the X-ray luminosity-temperaturerelation over the complete observed cluster mass range. As expected, we findthe slope of these scaling relations and the evolution of their normalizationwith redshift departs significantly from the self-similar predictions. However,for a sample of hot clusters with core-excised temperatures$k_{\rm{B}}T\geq5\,\rm{keV}$ the normalization and slope of the observable-massrelations and their evolution are significantly closer to self-similar. Theexception is the temperature-mass relation, for which the increased importanceof non-thermal pressure support and biased X-ray temperatures leads to agreater departure from self-similarity in the hottest systems. As aconsequence, these also affect the slope and evolution of the normalization inthe luminosity-temperature relation. The median hot gas profiles show goodagreement with observational data at $z=0$ and $z=1$, with their evolutionagain departing significantly from the self-similar prediction. However,selecting a hot sample of clusters yields profiles that evolve significantlycloser to the self-similar prediction. In conclusion, our results show thatunderstanding the selection function is vital for robust calibration of clusterproperties with mass and redshift.

The redshift evolution of massive galaxy clusters in the MACSIS simulations