Relativistic SZ temperature scaling relations of groups and clusters derived from the BAHAMAS and MACSIS simulations

Understand

The Sunyaev-Zeldovich (SZ) effect has long been recognized as a powerful cosmological probe.

• Using the BAHAMAS and MACSIS simulations to obtain $>10,000$ simulated galaxy groups and clusters, we compute three temperature measures and quantify the differences between them.
• The first measure is related to the X-ray emission of the cluster, while the second describes the non-relativistic thermal SZ (tSZ) effect.
• The third measure determines the lowest order relativistic correction to the tSZ signal, which is seeing increased observational relevance.