Undressing M87 by Exposing its Most Private Globulars

摘要

We present a multiwavelength photometric analysis of the innermost (3 × 3 kpc~2) Globular Clusters (GCs) of M87. Their Spectral Energy Distributions (SEDs) were built with J and K_s imaging obtained with NaCo at the VLT, along with HST UV-optical archival data. Using both Galatic GC templates and stellar population models, we derived ages (> 10 Gyr) and metallicities ([Fe/H]~-0.7) for these clusters (e.g: Cohen et al. 1998). These GCs have lower metallicities than its host galaxy. This agrees with the idea that the GC population formed earlier than the bulk of the stars.