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We report a detection of the effect of the large-scale velocity shear on thespatial distributions of the galactic satellites around the isolated hosts.Identifying the isolated galactic systems each of which consists of a singlehost galaxy and its satellites from the Seventh Data Release of the SloanDigital Sky Survey and reconstructing linearly the velocity shear field in thelocal universe, we measure the alignments between the relative positions of thesatellites from their isolated hosts and the principal axes of the localvelocity shear tensors projected on to the plane of sky. We find a clear signalthat the galactic satellites in isolated systems are located preferentiallyalong the directions of the minor principal axes of the large-scale velocityshear field. Those galactic satellites which are spirals, brighter, located atdistances larger than the projected virial radii of the hosts and belonging tothe spiral hosts yield stronger alignment signals, which implies that thealignment strength depends on the formation and accretion epochs of thegalactic satellites. It is also shown that the alignment strength is quiteinsensitive to the cosmic web environment as well as the size and luminosity ofthe isolated hosts. Although this result is consistent with the numericalfinding of Libeskind et al. based on a N-body experiment, due to the very lowsignificance of the observed signals it remains inconclusive whether or not thevelocity shear effect on the satellite distribution is truly universal.

Detection of the velocity shear effect on the spatial distributions of the galactic satellites in isolated systems