VizieR Online Data Catalog: NGVS. XXXIV. Ultracompact dwarf galaxies in Virgo (Liu+, 2020)

The primary source of data used in this study is the Next Generation Virgo cluster Survey (NGVS; Ferrarese+ 2012ApJS..200....4F). The survey footprint covers the two main subclusters of Virgo (A and B, centered on M87 and M49, respectively) out to their virial radii (i.e., R₂₀₀=5.38° for Virgo A and 3.33° for Virgo B). The NGVS imaging consists of short and long exposures, where the former can be used to find ultracompact dwarf (UCD) galaxies brighter than g~18.5mag. All the NGVS fluxes are obtained with the MegaCam/WirCam instruments on the CFHT (Canada France Hawaii Telescope).

In addition to the imaging that forms the basis of this study, there are many past spectroscopic programs targeting the Virgo cluster that we can draw upon. Ferrarese+ 2012ApJS..200....4F summarized the relevant programs for Virgo compact stellar systems (i.e., GCs, UCDs, and dE, Ns) as of 2012; these include radial velocity measurements from various Multiple Mirror Telescope (MMT)/Hectospec, Magellan/IMACS, Very Large Telescope/VIMOS, and Anglo-Australian Telescope (AAT)/AAOmega programs (see the paper for details). Since then, a number of NGVS-motivated spectroscopic programs have been undertaken (see Section 2.1).

(2 data files).