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It is well known that Globular cluster systems are different among galaxies.Here we test to which degree these differences remain on the scale of galaxyclusters by comparing the globular clusters (GCs) in optical surveys of theVirgo galaxy cluster (ACSVCS) and the Fornax galaxy cluster (ACSFCS) inKolmogorov-Smirnoff Tests. Both surveys were obtained with the Advanced Camerafor Surveys (ACS) on board the Hubble Space Telescope, and contain thousands ofGCs in dozens of galaxies each. Also well over 100 point sources in the ChandraX-ray Observatory source catalogue were attributed to the GCs in both opticalcatalogues, and interpreted as low-mass X-ray binaries (LMXBs). Thus, theoptical and X-ray data are as uniform as possible. Our main findings are asfollows: (1) The spread in luminosities and half-light radii is larger in theACSVCS than in the ACSFCS. (2) The ratio between the half-light radii for theF475W-passband and the F850LP-passband is on average smaller in the ACSVCS. (3)The distribution of the LMXBs with the luminosity of the GCs is differentbetween both surveys. These findings are significant. The first finding couldbe a consequence of a wider spread in the distances of the GCs in the ACSVCS,but the others must have internal reasons in the GCs. Thus, the GC systems arealso different on a galaxy cluster scale.

Differences between the globular cluster systems of the Virgo and Fornax Galaxy Clusters