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We present new wide-field photometry and spectroscopy of the globularclusters (GCs) around NGC 4649 (M60), the third brightest galaxy in the Virgocluster. Imaging of NGC 4649 was assembled from a recently-obtained HST/ACSmosaic, and new Subaru/Suprime-Cam and archival CFHT/MegaCam data. About 1200sources were followed up spectroscopically using combined observations fromthree multi-object spectrographs: Keck/DEIMOS, Gemini/GMOS and MMT/Hectospec.We confirm 431 unique GCs belonging to NGC 4649, a factor of 3.5 larger thanprevious datasets and with a factor of 3 improvement in velocity precision. Weconfirm significant GC colour bimodality and find that the red GCs are morecentrally concentrated, while the blue GCs are more spatially extended. Weinfer negative GC colour gradients in the innermost 20 kpc and flat gradientsout to large radii. Rotation is detected along the galaxy major axis for alltracers: blue GCs, red GCs, galaxy stars and planetary nebulae. We compare theobserved properties of NGC 4649 with galaxy formation models. We find thatformation via a major merger between two gas-poor galaxies, followed bysatellite accretion, can consistently reproduce the observations of NGC 4649 atdifferent radii. We find no strong evidence to support an interaction betweenNGC 4649 and the neighbouring spiral galaxy NGC 4647. We identify interestingGC kinematic features in our data, such as counter-rotating subgroups and bumpykinematic profiles, which encode more clues about the formation history of NGC4649.

A SLUGGS and Gemini/GMOS combined study of the elliptical galaxy M60: wide-field photometry and kinematics of the globular cluster system