J/ApJS/171/101      ACS Virgo cluster Survey. XII.               (Jordan+, 2007)
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Beginning of ReadMe : J/ApJS/171/101 Globular clusters in the ACS Virgo cluster survey (Jordan+, 2007) ================================================================================ The ACS Virgo cluster survey. XII. The luminosity function of globular clusters in early-type galaxies. Jordan A., McLaughlin D.E., Cote P., Ferrarese L., Peng E.W., Mei S., Villegas D., Merritt D., Tonry J.L., West M.J. <Astrophys. J. Suppl. Ser., 171, 101-145 (2007)> =2007ApJS..171..101J ================================================================================ ADC_Keywords: Clusters, globular ; Surveys Keywords: galaxies: elliptical and lenticular, cD - galaxies: star clusters - globular clusters: general Abstract: We analyze the luminosity function of the globular clusters (GCs) belonging to the early-type galaxies observed in the ACS Virgo Cluster Survey. We have obtained maximum likelihood estimates for a Gaussian representation of the globular cluster luminosity function (GCLF) for 89 galaxies. We have also fit the luminosity functions with an "evolved Schechter function", which is meant to reflect the preferential depletion of low-mass GCs, primarily by evaporation due to two-body relaxation, from an initial Schechter mass function similar to that of young massive clusters in local starbursts and mergers. We find a highly significant trend of the GCLF dispersion sigma with galaxy luminosity, in the sense that the GC systems in smaller galaxies have narrower luminosity functions. The GCLF dispersions of our Galaxy and M31 are quantitatively in keeping with this trend, and thus the correlation between sigma and galaxy luminosity would seem more fundamental than older notions that the GCLF dispersion depends on Hubble type. We show that this narrowing of the GCLF in a Gaussian description is driven by a steepening of the cluster mass function above the classic turnover mass, as one moves to lower luminosity host galaxies. In a Schechter function description, this is reflected by a steady decrease in the value of the exponential cutoff mass scale. We argue that this behavior at the high-mass end of the GC mass function is most likely a consequence of systematic variations of the initial cluster mass function rather than long-term dynamical evolution. Description: A sample of 100 early-type galaxies in the Virgo Cluster was observed for the ACSVCS (Cote et al., 2004ApJS..153..223C). Each galaxy was imaged in F475W ( Sloan g) and F850LP ( Sloan z) bandpasses for a total of 750 and 1210s, respectively, and reductions were performed as described in Jordan et al., 2004ApJS..154..509J).