Program: GN-2016A-Q-69

The aim of this proposal is to perform the first deep (g',r',i') GMOS-N photometry of the globular cluster system (GCS) around the early-type galaxy (ETG) NGC 3640. This galaxy shows a quite disturbed structure and the analysis of the properties of its GCS will help to reconstruct the evolutionary history. In addition, it is located in a low-density environment, a type of scenario where few GCSs of ETGs have been studied in detail to date. We will focus on detecting 'anomalies' in the GC color-magnitude diagram, as well as in the color, azimuthal and radial projected distributions. Such anomalies, e.g. a third GC subpopulation in addition to the usual 'blue' and 'red' ones, abnormal specific frequency Sn or fractions of 'blue'/'red' clusters, or overdensities in the projected distributions, etc. will lead to detect intermediate-age populations, and/or trace past (or present) interactions. The turn-over of the luminosity function can be reached thanks to the deep photometry, and total GC population and Sn will be calculated and compared with those of ETGs in high-density environments.