A catalogue of masses, structural parameters, and velocity dispersion profiles of 112 Milky Way globular clusters

Abstract

We have determined masses, stellar mass functions and structural parameters\nof 112 Milky Way globular clusters by fitting a large set of N-body simulations\nto their velocity dispersion and surface density profiles. The velocity\ndispersion profiles were calculated based on a combination of more than 15,000\nhigh-precision radial velocities which we derived from archival ESO/VLT and\nKeck spectra together with ~20,000 published radial velocities from the\nliterature. Our fits also include the stellar mass functions of the globular\nclusters, which are available for 47 clusters in our sample, allowing us to\nself-consistently take the effects of mass segregation and ongoing cluster\ndissolution into account. We confirm the strong correlation between the global\nmass functions of globular clusters and their relaxation times recently found\nby Sollima & Baumgardt (2017). We also find a correlation of the escape\nvelocity from the centre of a globular cluster and the fraction of first\ngeneration stars (FG) in the cluster recently derived for 57 globular clusters\nby Milone et al. (2017), but no correlation between the FG star fraction and\nthe global mass function of a globular cluster. This could indicate that the\nability of a globular cluster to keep the wind ejecta from the polluting\nstar(s) is the crucial parameter determining the presence and fraction of\nsecond generation stars and not its later dynamical mass loss.\n