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Journal Articles The Astrophysical Journal Supplement Year : 2020

The Next Generation Virgo Cluster Survey. XXXIV. Ultracompact Dwarf Galaxies in the Virgo Cluster

Chengze Liu
  • Function : Author
Patrick Côté
  • Function : Author
Eric W Peng
  • Function : Author
Joel Roediger
  • Function : Author
Hongxin Zhang
  • Function : Author
Laura Ferrarese
  • Function : Author
Ruben Sánchez-Janssen
  • Function : Author
Puragra Guhathakurta
  • Function : Author
Xiaohu Yang
  • Function : Author
Yipeng Jing
  • Function : Author
Karla Alamo-Martínez
  • Function : Author
John P Blakeslee
  • Function : Author
Alessandro Boselli
Jean-Charles Cuilandre
  • Function : Author
Patrick Durrell
Stephen Gwyn
Andres Jordán
Youkyung Ko
  • Function : Author
Ariane Lançon
Sungsoon Lim
Alessia Longobardi
  • Function : Author
Simona Mei
  • Function : Author
J. Christopher Mihos
  • Function : Author
Roberto Muñoz
  • Function : Author
Thomas Puzia
Chelsea Spengler
  • Function : Author
Elisa Toloba
  • Function : Author


We present a study of ultra compact dwarf (UCD) galaxies in the Virgo cluster based mainly on imaging from the Next Generation Virgo Cluster Survey (NGVS). Using ∼100 deg 2 of u * giz imaging , we have identified more than 600 candidate UCDs, from the core of Virgo out to its virial radius. Candidates have been selected through a combination of magnitudes, ellipticities, colors, surface bright-nesses, half-light radii and, when available, radial velocities. Candidates were also visually validated from deep NGVS images. Subsamples of varying completeness and purity have been defined to explore the properties of UCDs and compare to those of globular clusters and the nuclei of dwarf galaxies with the aim of delineating the nature and origins of UCDs. From a surface density map, we find the UCDs to be mostly concentrated within Virgo's main subclusters, around its brightest galaxies. We identify Corresponding author: Chengze Liu arXiv:2007.15275v1 [astro-ph.GA] 30 Jul 2020 2 Liu et al. several subsamples of UCDs-i.e., the brightest, largest, and those with the most pronounced and/or asymmetric envelopes-that could hold clues to the origin of UCDs and possible evolutionary links with dwarf nuclei. We find some evidence for such a connection from the existence of diffuse envelopes around some UCDs, and comparisons of radial distributions of UCDs and nucleated galaxies within the cluster.
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hal-02993459 , version 1 (06-11-2020)



Chengze Liu, Patrick Côté, Eric W Peng, Joel Roediger, Hongxin Zhang, et al.. The Next Generation Virgo Cluster Survey. XXXIV. Ultracompact Dwarf Galaxies in the Virgo Cluster. The Astrophysical Journal Supplement, 2020, 250 (1), pp.17. ⟨10.3847/1538-4365/abad91⟩. ⟨hal-02993459⟩
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