Mock images of an equal-mass merger between Sa and Sb galaxies, merging perpendicular to each other in a parabolic orbit (impact parameter 40 Kpc, pericentric distance 5 Kpc). Each row exhibits notable merger events in time sequence: i.e., before first perigee (FP) pass, first perigee pass, final coalescence (FC), 2 × FC, and 3 × FC, from left to right. The colour scheme represents surface brightness in the SDSS r′ band. Top and bottom rows show the mock images in two different observing conditions, that is, μr = 25 mag arcsec-2 (top) and μr = 28 mag arcsec-2 (bottom). The deep mock images (bottom) correspond to the depth of the Sheen et al. observation.
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