The Next Generation Virgo cluster Survey (NGVS). XXV. Fiducial panchromatic colors of Virgo core globular clusters and their comparison to model predictions - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Astrophys.J.Suppl. Année : 2016

The Next Generation Virgo cluster Survey (NGVS). XXV. Fiducial panchromatic colors of Virgo core globular clusters and their comparison to model predictions

Ariane Lançon
Thomas H. Puzia
  • Fonction : Auteur
Eric W. Peng
  • Fonction : Auteur
Chengze Liu
  • Fonction : Auteur
Roberto P. Muñoz
  • Fonction : Auteur
John P. Blakeslee
  • Fonction : Auteur
Patrick Côté
  • Fonction : Auteur
Laura Ferrarese
  • Fonction : Auteur
Joel Roediger
  • Fonction : Auteur
Rúben Sánchez-Janssen
  • Fonction : Auteur
Hongxin Zhang
  • Fonction : Auteur
Patrick R. Durrell
  • Fonction : Auteur
Puragra Guhathakurta
  • Fonction : Auteur
S.D.J. Gwyn
  • Fonction : Auteur
Elisa Toloba
  • Fonction : Auteur

Résumé

The central region of the Virgo Cluster of galaxies contains thousands of globular clusters (GCs), an order of magnitude more than the number of clusters found in the Local Group. Relics of early star formation epochs in the universe, these GCs also provide ideal targets to test our understanding of the spectral energy distributions (SEDs) of old stellar populations. Based on photometric data from the Next Generation Virgo Cluster Survey (NGVS) and its near-infrared counterpart NGVS-IR, we select a robust sample of $\approx 2000$ GCs with excellent photometry and that span the full range of colors present in the Virgo core. The selection exploits the well-defined locus of GCs in the uiK diagram and the fact that the GCs are marginally resolved in the images. We show that the GCs define a narrow sequence in five-dimensional color space, with limited but real dispersion around the mean sequence. The comparison of these SEDs with the predictions of 11 widely used population synthesis models highlights differences between the models and also shows that no single model adequately matches the data in all colors. We discuss possible causes for some of these discrepancies. Forthcoming papers of this series will examine how best to estimate photometric metallicities in this context, and compare the Virgo GC colors with those in other environments.

Dates et versions

hal-01554124 , version 1 (03-07-2017)

Identifiants

Citer

Mathieu Powalka, Ariane Lançon, Thomas H. Puzia, Eric W. Peng, Chengze Liu, et al.. The Next Generation Virgo cluster Survey (NGVS). XXV. Fiducial panchromatic colors of Virgo core globular clusters and their comparison to model predictions. Astrophys.J.Suppl., 2016, 227 (1), pp.12. ⟨10.3847/0067-0049/227/1/12⟩. ⟨hal-01554124⟩
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