  We measure the halo power spectrum in redshift space from cosmological N-body
simulations, and test the analytical models of redshift distortions
particularly focusing on the scales of baryon acoustic oscillations (BAOs).
Remarkably, the measured halo power spectrum in redshift space exhibits a
large-scale enhancement in amplitude relative to the real-space clustering, and
the effect becomes significant for the massive or highly biased halo samples.
These findings cannot be simply explained by the so-called streaming model
frequently used in the literature. By contrast, a physically-motivated
perturbation theory model developed in the previous paper reproduces the halo
power spectrum very well, and the model combining a simple linear
scale-dependent bias can accurately characterize the clustering anisotropies of
halos in two dimensions, i.e., line-of-sight and its perpendicular directions.
The results highlight the significance of non-linear coupling between density
and velocity fields associated with two competing effects of redshift
distortions, i.e., Kaiser and Finger-of-God effects, and a proper account of
this effect would be important in accurately characterizing the BAOs in two
dimensions.
