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We study the azimuthal distribution of globular clusters (GCs) in early-typegalaxies and compare them to their host galaxies using data from the ACS VirgoCluster Survey. We find that in host galaxies with visible elongation (epsilon> 0.2) and intermediate to high luminosities (M_z<-19), the GCs arepreferentially aligned along the major axis of the stellar light. The red(metal-rich) GC subpopulations show strong alignment with the major axis of thehost galaxy, which supports the notion that these GCs are associated withmetal-rich field stars. The metal-rich GCs in lenticular galaxies show signs ofbeing more strongly associated with disks rather than bulges. Surprisingly, wefind that the blue (metal-poor) GCs can also show the same correlation. If themetal-poor GCs are part of the early formation of the halo and built up throughmergers, then our results support a picture where halo formation and mergingoccur anisotropically, and where the present day major axis is an indicator ofthe preferred merging axis.

The ACS Virgo Cluster Survey. XVII. The Spatial Alignment of Globular Cluster Systems With Early-Type Host Galaxies