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Fig. 6.

image

Upper panel: histogram of the projected (i.e., radial) velocity differences between members of galaxy pairs in the UGC pair catalog for a bin width of 40 km s−1. Lower panel: deprojected PDF of the 3D true intervelocities between members of galaxy pairs in the UGC pair Catalog, for the unbiased subsample with blue major axes < 1.2 arcmin. The red continuous curve is obtained by the deprojection method using a moving bin. The dashed black curve represents the result of deprojection by constant bins of width 30 km s−1. Both methods yield a main peak at ≈150 km s−1 and a possible secondary peak at ≈350 km s−1, in agreement with the results from the IGP catalog.

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