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We have carried out a search for substructure within the globular clustersystems of M84 (NGC 4374) and M86 (NGC 4406), two giant elliptical galaxies inthe Virgo Cluster. We use wide-field (36 arcmin x 36 arcmin), multi-colorbroadband imaging to identify globular cluster candidates in these two galaxiesas well as several other nearby lower-mass galaxies. Our analysis of thespatial locations of the globular cluster candidates reveals severalsubstructures, including: a peak in the projected number density of globularclusters in M86 that is offset from the system center and may be at leastpartly due to the presence of the dwarf elliptical galaxy NGC 4406B; a bridgethat connects the M84 and M86 globular cluster systems; and a boxy iso-densitycontour along the southeast side of the M86 globular cluster system. We divideour sample into red (metal-rich) and blue (metal-poor) globular clustercandidates to look for differences in the spatial distributions of the twopopulations and find that the blue cluster candidates are the dominantpopulation in each of the substructures we identify. We also incorporate themeasurements from two radial velocity surveys of the globular clusters in theregion and find that the bridge substructure is populated by globular clusterswith a mix of velocities that are consistent with either M86 and M84, possiblyproviding further evidence for interaction signatures between the two galaxies.

Substructure in the Globular Cluster Populations of the Virgo Cluster Elliptical Galaxies M84 and M86