DARK MATTER HALOS IN GALAXIES AND GLOBULAR CLUSTER POPULATIONS

We combine a new, comprehensive database for globular cluster populations in all types of galaxies with a new calibration of galaxy halo masses based entirely on weak lensing. Correlating these two sets of data, we find that the mass ratio η ≡ MGCS/Mh (total mass in globular clusters, divided by halo mass) is essentially constant at 〈η〉 ∼ 4 × 10−5, strongly confirming earlier suggestions in the literature. Globular clusters are the only known …