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Fig. 2.

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Gravitational valleys in the Local Universe. Left and middle: both panels show a supergalactic cartesian SGX-SGY slice of width 7.8 Mpc h−1, centered on SGZ = 0 Mpc h−1, of the density of streamlines, derived from the ungrouped (left) and grouped (right) CF4 velocity field. Yellow represents voxels highly concentrated in streamlines, while black represents a low concentration of streamlines. Right: density of streamlines from a ΛCDM simulation constrained with the CF2 data, with the same color code. Structures are annotated in the figure. Note that the scale of the axes is different from the two other panels. As a matter of fact, the CF2 catalog was much sparser in data (seven times less data) and much smaller in cartographied volume (ten times smaller compared to CF4), thus this simulation is loosely constrained on scales up to 150 Mpc h−1 maximum. Also at that time, we had poor coverage of the southern hemisphere large-scale structures.

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