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An observational evidence is presented for the alignment between the cosmicsheet and the principal axis of the velocity shear field at the position of theVirgo cluster. The galaxies in and around the Virgo cluster from the ExtendedVirgo Cluster Catalog recently constructed by Kim et al. are used to determinethe direction of the local sheet. The peculiar velocity field reconstructedfrom the Sloan Digital Sky Survey Data Release 7 is analyzed to estimate thelocal velocity shear tensor at the Virgo center. Showing first that the minorprincipal axis of the local velocity shear tensor is almost parallel to theline of sight direction, we detect a clear signal of alignment between thepositions of the Virgo satellites and the intermediate principal axis of thelocal velocity shear projected onto the plane of the sky. Furthermore, thedwarf satellites are found to appear more strongly aligned than the normalcounterparts, which is interpreted as indication of the following: (i) Thenormal and the dwarf satellites fall in the Virgo cluster preferentially alongthe local filament and the local sheet, respectively. (ii) The local filamentis aligned with the minor principal axis of the local velocity shear while thelocal sheet is in parallel to the plane spanned by the minor and theintermediate principal axes. Our result is consistent with the recent numericalclaim that the velocity shear is a good tracer of the cosmic web.

Alignments of the Galaxies in and around the Virgo Cluster with the Local Velocity Shear