Baryon Pasting Algorithm: Halo-based and Particle-based Pasting Methods

Understand

We present a fast methodology to produce mock observations of the thermal and kinetic Sunyaev-Zel'dovich (SZ) effects based on the dark matter only $N$-body simulations coupled with the analytic intra-cluster medium model.

• The methods employ two different approaches: halo-based pasting (HP) and particle-based pasting (PP).
• The former pastes gas density and pressure onto halos and requires only a halo catalogue, and the latter considers the contribution from field particles as well, i.e., particles that do not belong to any halos and thus utilise the full particle information.
• Therefore, the PP algorithm incorporates secondary effects beyond the HP algorithm: asphericity of halos and contribution from diffuse gas.