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We present the first measurement of the globular cluster populationsurrounding the elliptical galaxy J07173724+3744224 (z=0.1546). This galaxy islocated in the foreground in the field-of-view of the Hubble Space Telescope(HST) Frontier Fields observations of galaxy cluster MACS J0717.5+3745(z=0.5458). Based on deep HST ACS F435W, F606W, and F814W images, we find atotal globular cluster population of N_tot = 3441 +/- 1416. Applying theappropriate extinction correction and filter transformation from ACS F814W tothe Johnson V-band, we determine that the host galaxy has an absolute magnitudeof M_V = -22.2. The specific frequency was found to be S_N = 4.5 +/- 1.8. Theradial profile of the globular cluster system was best fit using a powerlaw ofthe form $\sigma\sim R^{-0.6}$, with the globular cluster population found tobe more extended than the halo light of the host galaxy ($\sigma_{halo}\simR^{-1.7}$). The F435W-F814W colour distribution suggests a bimodal population,with red globular clusters 1-3x more abundant than blue clusters. These resultsare consistent with the host elliptical galaxy J07173724+3744224 having formedits red metal-rich GCs in situ, with the blue metal-poor globular clustersaccreted from low-mass galaxies.

Globular cluster population of the HST frontier fields galaxy J07173724+3744224