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Fig. 1

image

Selection of physical pairs and triplets. Upper panel: 2D distribution of the line-of-sight velocity difference and projected distance for isolated-pair and isolated-triplet candidates with respect to the brightest A galaxy. Colours correspond to the galaxy counts according to the colour bar. Middle panel: absolute values of the line-of-sight velocity difference Δν = | νA − νN | (black histogram), and the corresponding Gaussian distribution fits for σ between 70 and 100 km s-1 (grey curves) with the best fit (blue curve) within the first 250 km s-1 (red dashed line). The corresponding 2σ is shaded. Lower panel: probability density function (PDF) for neighbour galaxies within 2σ over PDF for the background flat population selected in the interval 300 < Δν < 500 km s-1, as a function of the distance to the A galaxy. Red dashed and blue dash-dotted lines correspond to the median and mean values in the different distance intervals, respectively. The inner regions up to 250 and 450 kpc are shaded.

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