Galaxy Clusters at the Edge: Temperature, Entropy, and Gas Dynamics at the Virial Radius

Understand

Recently, Suzaku has produced temperature and entropy profiles, along with profiles of gas density, gas fraction, and mass, for multiple galaxy clusters out to ~r_200 (~= virial radius).

• In this paper, we compare these novel X-ray observations with results from N-body + hydrodynamic adaptive mesh refinement cosmological simulations using the Enzo code.
• There is excellent agreement in the temperature, density, and entropy profiles between a sample of 27 mostly substructure-free massive clusters in the simulated volume and the observed clusters.
• This supports our previous contention that clusters have "universal" outer temperature profiles.