We perform aperture photometry and profile fitting on 419 globular cluster ( GC ) candidates with m _ { V } \leq 23 mag identified in Hubble Space Telescope Advanced Camera for Surveys BVI imaging , and estimate the effective radii of the clusters .
We identify 85 previously known spectroscopically-confirmed clusters , and newly identify 136 objects as good cluster candidates within the 3 \sigma color and size ranges defined by the spectroscopically confirmed clusters , yielding a total of 221 probable GCs .
The luminosity function peak for the 221 probable GCs with estimated total dereddening applied is V \sim ( 20.26 \pm 0.13 ) mag , corresponding to a distance of \sim 3.7 \pm 0.3 Mpc .
The blue and red GC candidates , and the metal-rich ( MR ) and metal-poor ( MP ) spectroscopically confirmed clusters , are similar in half-light radius , respectively .
Red confirmed clusters are about 6 % larger in median half-light radius than blue confirmed clusters , and red and blue good GC candidates are nearly identical in half-light radius .
The total population of confirmed and “ good ” candidates shows an increase in half-light radius as a function of galactocentric distance .