Best-fit gas bulk velocity (left) and velocity dispersion (right) maps of the Perseus cluster from nine XRISM/Resolve pointings. The maps are centered on the Perseus center (RA = 49.9507, Dec = 41.5117). The N and NE regions show the E+NE joint fitting result assuming a single temperature model. The color patches indicate the sky areas that contribute 50% of the photons for the corresponding sub-regions based on raytracing simulations. The measurement uncertainties are shown in Fig. 4. The Chandra X-ray residual is overlaid in the background highlighting the inner sloshing spiral and the eastern X-ray surface brightness excess, with black circles marking radii of 100, 200, and 300 kpc. The bulk velocity distribution, in the rest frame of the central ICM (z_icm = 0.017628), shows an (asymmetric) dipole-like pattern, revealing a rotational motion of the ICM (see Sect. 3).