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We present the first photometric study of the globular cluster system (GCS)of the E galaxy NGC 3613 (Mv = -21.5, d = 30.1 Mpc), as well as the surfacephotometry of the host galaxy, based on Gemini/GMOS images. Being consideredthe central galaxy of a group, NGC 3613 inhabits a low-density environmentalthough its intrinsic brightness is similar to the expected one for galaxiesin the centre of clusters. The following characteristics are obtained for thisGCS. The colour distribution is bimodal, with metal-poor globular clusters(GCs) getting slightly bluer with increasing radius. The radial and azimuthalprojected distributions show that metal-rich GCs are more concentrated towardsthe host galaxy and trace its light distribution very precisely, whilemetal-poor GCs present a more extended and uniform distribution. The GCluminosity function helps validate the adopted distance. The estimated total GCpopulation of Ntot= 2075 +/- 130 leads to a specific frequency Sn=5.2 +/- 0.7,a value within the expected range for GCSs with host galaxies of similarluminosity. The surface photometry of NGC 3613 reveals a three-componentprofile and a noticeable substructure. Finally, a small sample of ultra-compactdwarf (UCD) candidates are identified in the surroundings of the host galaxy.

A Gemini/GMOS study of the bright elliptical galaxy NGC 3613 and its globular cluster system