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In our recent report, observational evidence supports that the rotationaldirection of a galaxy tends to be coherent with the average motion of itsnearby neighbors within 1 Mpc. We extend the investigation to neighbors atfarther distances, in order to examine if such dynamical coherence is foundeven in large scales. The Calar Alto Legacy Integral Field Area (CALIFA) surveydata and the NASA-Sloan Atlas (NSA) catalog are used. From the composite map ofvelocity distribution of 'neighbor' galaxies within 15 Mpc from the CALIFAgalaxies, the composite radial profiles of the luminosity-weighted meanvelocity of neighbors are derived. These profiles show unexpectedly strongevidence of the dynamical coherence between the rotation of the CALIFA galaxiesand the average line-of-sight motion of their neighbors within several Mpcdistances. Such a signal is particularly strong when the neighbors are limitedto red ones: the luminosity-weighted mean velocity at 1 < D <= 6 Mpc is aslarge as 30.6+/-10.9 km/s (2.8-sigma significance to random spin-axisuncertainty) for central rotation (R <= Re). In the comparison of severalsubsamples, the dynamical coherence tends to be marginally stronger for thediffuse or kinematically-well-aligned CALIFA galaxies. For this mysteriouscoherence in large scales, we cautiously suggest a scenario that it resultsfrom a possible relationship between the long-term motion of a large-scalestructure and the rotations of galaxies in it.

Mysterious Coherence in Several-Megaparsec Scales Between Galaxy Rotation and Neighbor Motion