THE NEXT GENERATION VIRGO CLUSTER SURVEY. VIII. THE SPATIAL DISTRIBUTION OF GLOBULAR CLUSTERS IN THE VIRGO CLUSTER - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue The Astrophysical Journal Année : 2014

THE NEXT GENERATION VIRGO CLUSTER SURVEY. VIII. THE SPATIAL DISTRIBUTION OF GLOBULAR CLUSTERS IN THE VIRGO CLUSTER

Patrick R. Durrell
  • Fonction : Auteur
Patrick Cote
  • Fonction : Auteur
Eric W. Peng
  • Fonction : Auteur
John P. Blakeslee
  • Fonction : Auteur
Laura Ferrarese
  • Fonction : Auteur
J. Christopher Mihos
  • Fonction : Auteur
Thomas H. Puzia
  • Fonction : Auteur
Ariane Lancon
  • Fonction : Auteur
Chengze Liu
  • Fonction : Auteur
Hongxin Zhang
  • Fonction : Auteur
Jean-Charles Cuillandre
  • Fonction : Auteur
Alan Mcconnachie
  • Fonction : Auteur
Andres Jordan
  • Fonction : Auteur
Katharine Accetta
  • Fonction : Auteur
Samuel Boissier
Stephane Courteau
  • Fonction : Auteur
Pierre-Alain Duc
Eric Emsellem
Stephen Gwyn
Simona Mei
  • Fonction : Auteur
James E. Taylor
  • Fonction : Auteur

Résumé

We report on a large-scale study of the distribution of globular clusters (GCs) throughout the Virgo cluster, based on photometry from the Next Generation Virgo Cluster Survey (NGVS), a large imaging survey covering Virgo's primary subclusters (Virgo A = M87 and Virgo B = M49) out to their virial radii. Using the g(o)', (g' - i')(o) color-magnitude diagram of unresolved and marginally resolved sources within the NGVS, we have constructed two-dimensional maps of the (irregular) GC distribution over 100 deg(2) to a depth of g(o)' = 24. We present the clearest evidence to date showing the difference in concentration between red and blue GCs over the full extent of the cluster, where the red (more metal-rich) GCs are largely located around the massive early-type galaxies in Virgo, while the blue (metal-poor) GCs have a much more extended spatial distribution with significant populations still present beyond 83' (similar to 215 kpc) along the major axes of both M49 and M87. A comparison of our GC maps to the diffuse light in the outermost regions of M49 and M87 show remarkable agreement in the shape, ellipticity, and boxiness of both luminous systems. We also find evidence for spatial enhancements of GCs surrounding M87 that may be indicative of recent interactions or an ongoing merger history. We compare the GC map to that of the locations of Virgo galaxies and the X-ray intracluster gas, and find generally good agreement between these various baryonic structures. We calculate the Virgo cluster contains a total population of N-GC = 67,300 +/- 14,400, of which 35% are located in M87 and M49 alone. For the first time, we compute a cluster-wide specific frequency SN, CL = 2.8 +/- 0.7, after correcting for Virgo's diffuse light. We also find a GC-to-baryonic mass fraction is an element of(b) = 5.7 +/- 1.1 x 10(-4) and a GC-to-total cluster mass formation efficiency C-t = 2.9 +/- 0.5 x 10(-5), the latter values slightly lower than but consistent with those derived for individual galactic halos. Taken as a whole, our results show that the production of the complex structures in the unrelaxed Virgo cluster core (including the production of the diffuse intracluster light) is an ongoing and continuing process.

Dates et versions

hal-01441038 , version 1 (19-01-2017)

Identifiants

Citer

Patrick R. Durrell, Patrick Cote, Eric W. Peng, John P. Blakeslee, Laura Ferrarese, et al.. THE NEXT GENERATION VIRGO CLUSTER SURVEY. VIII. THE SPATIAL DISTRIBUTION OF GLOBULAR CLUSTERS IN THE VIRGO CLUSTER. The Astrophysical Journal, 2014, 794 (2), ⟨10.1088/0004-637X/794/2/103⟩. ⟨hal-01441038⟩
72 Consultations
0 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More