Baryon Pasting Algorithm: Halo-based and Particle-based Pasting Methods
  We present a fast methodology to produce mock observations of the thermal and
kinetic Sunyaev-Zel'dovich (SZ) effects based on 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 halo catalogue, and the latter also considers contribution from
field particles as well, i.e., particles which do not belong to any halos, and
thus utilises the full particle information. Therefore, the PP algorithm
incorporates secondary effects beyond the HP algorithm: asphericity of halos
and contribution from diffuse gas. In particular, such diffuse component is the
dominant source of the kinetic SZ effect. As validation of our methods, we have
produced 108 all-sky maps with HP and 108 flat-sky maps which cover $5 \times 5
\, \mathrm{deg}^2$ with both of HP and PP. Our method can produce a mock map
within a few hours even for all-sky coverage with parallel computational
environment. The resultant power spectra of these maps are consistent with
theoretical predictions. We discuss the utility of baryon pasted mock SZ maps
for estimating the covariance matrix of cross-correlation between SZ effects
and other large-scale structure probes as well as modelling the selection and
projection effects for cluster cosmology.
