Dust location in the central kpc field of view of Andromeda. Left panel: Dust emission map obtained from the 8 μm Spitzer map with a subtraction of the stellar continuum at 3.6 μm. (Block et al. 2006). The contours correspond to the ionized gas intensity displayed in the top left panel of Fig. 5. The dashed square corresponds to the inner ring region displayed in the right panel. Right panel: an upper limit estimate on the A_B extinction (Melchior et al. 2000). The gray contours correspond to the dust emission at 8 μm displayed in the left panel. The black cross symbol represents the M31 center.