Evolution of tidal tail numbers. The three panels show the results for the three projections (XY, XZ, and YZ). In each panel, the black lines and the yellow shaded area represent the total number of tidal tails and their respective scatter, whereas the green ones are the number of tidal tails that are detectable on images with a cut in surface brightness at 29 mag arcsec−2. The time (t = 0) corresponds to the Big-Bang, and the re-simulation is longer than a Hubble time, beyond z = 0, to estimate the future of fine structures.
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