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A halo merger tree based on data from the Millennium Simulation (Springel et
al. 2005; De Lucia & Blaizot 2007) showing the formation of a
dark matter halo over time.
The (heat) colour map indicates the time-ordering in which
each sub-structure became bound to the final halo (red equals earliest times,
white equals latest times).
3-d spatial locations correspond to (x,y,z) coordinates within the
simulation box. Splats, or textured billboards, are used to represent each
point, with sizes scaled by the virial radius of the progenitor halos.
The splats rotate to remain directed towards the viewer regardless of
the camera orientation.
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