Searches for Ultra-Compact Dwarf Galaxies in Galaxy Groups

Abstract

We present the results of a search for ultra-compact dwarf galaxies (UCDs) in six different galaxy groups: Dorado, NGC1400, NGC0681, NGC4038, NGC4697 and NGC5084. We searched in the apparent magnitude range 17.5 < b_j < 20.5 (except NGC5084: 19.2 < b_j < 21.0). We found 1 definite plus 2 possible UCD candidates in the Dorado group and 2 possible UCD candidates in the NGC1400 group. No UCDs were found in the other groups. We compared these results with predicted luminosities of UCDs in the groups according to the hypothesis that UCDs are globular clusters formed in galaxies. The theoretical predictions broadly agree with the observational results, but deeper surveys are needed to fully test the predictions.

8 pages, 2 figures, accepted for publication in MNRAS

References in corpus (24)

• Final Results from the Hubble Space Telescope Key Project to Measure the Hubble Constant
• Evolutionary population synthesis: models, analysis of the ingredients and application to high-z galaxies
• The HST Key Project on the Extragalactic Distance Scale. XXVIII. Combining the Constraints on the Hubble Constant
• Formation of globular clusters in hierarchical cosmology
• Compact Stellar Systems in the Fornax Cluster: Super-massive Star Clusters or Extremely Compact Dwarf Galaxies?
• The Efficiency of Globular Cluster Formation
• The central region of the Fornax cluster -- II. Spectroscopy and radial velocities of member and background galaxies
• The Age Distribution of Massive Star Clusters in the Antennae Galaxies
• Galaxy threshing and the origin of ultra-compact dwarf galaxies in the Fornax cluster
• The Formation of Ultra-Compact Dwarf Galaxies
• Galaxy threshing and the formation of ultra-compact dwarf galaxies
• Ultra-Compact Dwarf Galaxies in the Fornax Cluster
• The dynamical mass of the young cluster W3 in NGC 7252: Heavy-Weight globular cluster or ultra compact dwarf galaxy ?
• Internal Properties of Ultra-Compact Dwarf Galaxies in the Virgo Cluster
• Globular Clusters in 19 Northern Abell Clusters
• Dynamical Masses of Young Star Clusters in NGC 4038/4039
• Ultra Compact Objects in the Fornax Cluster of Galaxies: Globular clusters or dwarf galaxies?
• Dynamical masses of ultra-compact dwarf galaxies in Fornax
• Fornax compact object survey FCOS: On the nature of Ultra Compact Dwarf galaxies
• Discovery of Ultra-Compact Dwarf Galaxies in the Virgo Cluster
• Ultra Compact Dwarf galaxies in Abell 1689: a photometric study with the ACS
• Kinematics, Substructure and Luminosity-weighted Dynamics of Six Nearby Galaxy Groups
• On spatial distributions of old globular clusters in clusters of galaxies
• NGC 5084: A Massive Disk Galaxy Accreting its Satellites ?

Cited by in corpus (35)

• Ultra compact dwarf galaxy formation by tidal stripping of nucleated dwarf galaxies
• Contribution of stripped nuclear clusters to globular cluster and ultra-compact dwarf galaxy populations
• The triggering of starbursts in low-mass galaxies
• Hypercompact Stellar Systems Around Recoiling Supermassive Black Holes
• Mapping the Dark Side with DEIMOS: Globular Clusters, X-ray Gas, and Dark Matter in the NGC 1407 Group
• Structural Properties of Ultra-Compact Dwarf Galaxies in the Fornax and Virgo Clusters
• The Ubiquity and Dual Nature of Ultra Compact Dwarfs
• Dynamical versus Stellar Masses of Ultracompact Dwarf Galaxies in the Fornax Cluster
• The HST/ACS Coma Cluster Survey: V - Compact Stellar Systems in the Coma Cluster
• The specific frequencies of ultra-compact dwarf galaxies
• The Next Generation Virgo Cluster Survey. X. Properties of Ultra-Compact Dwarfs in the M87, M49 and M60 Regions
• SDSSJ124155.33+114003.7 -- a Missing Link Between Compact Elliptical and Ultracompact Dwarf Galaxies
• A large population of ultra-compact dwarf galaxies in the Hydra I cluster
• An Ultra Compact Dwarf around the Sombrero galaxy (M104): the Nearest Massive UCD
• Two formation channels of UCDs in Hickson Compact Groups
• Ultra-Compact Dwarfs in the Coma Cluster
• Midlife Crises in Dwarf Galaxies in the NGC 5353/4 Group
• The Next Generation Virgo Cluster Survey. XXXIV. Ultra-Compact Dwarf (UCD) Galaxies in the Virgo Cluster
• Star formation histories of the LEGUS dwarf galaxies (III): the non-bursty nature of 23 star forming dwarf galaxies
• Star Formation Histories of the LEGUS Dwarf Galaxies (I): recent History of NGC1705, NGC4449 and Holmberg II
• The SLUGGS Survey: HST/ACS Mosaic Imaging of the NGC 3115 Globular Cluster System
• A metal-poor ultra compact dwarf galaxy at a kiloparsec distance from the low-mass elliptical galaxy FCC47
• Ultra-Compact Dwarf Candidates Near the Lensing Galaxy in Abell S0740
• Uncovering the formation of ultra-compact dwarf galaxies by multivariate statistical analysis
• Ultra-Compact Dwarfs in the Fossil Group NGC 1132
• Gemini Spectroscopy of Ultra-Compact Dwarfs in the Fossil Group NGC 1132
• Contribution of stripped nuclei to the ultracompact dwarf galaxy population in the Virgo Cluster
• Keck Cosmic Web Imager (KCWI) Spectra of Globular Clusters and Ultra Compact Dwarfs in the Halo of M87
• First confirmed ultra-compact dwarf galaxy in the NGC 5044 group
• Testing the tidal stripping scenario of ultra-compact dwarf galaxy formation by using internal properties
• Ages and structural and dynamical parameters of two globular clusters in the M81 group
• A new technique for the determination of the initial mass function in unresolved stellar populations
• The contribution of supermassive black holes in stripped nuclei to the supermassive black hole population of UCDs and galaxy clusters
• Satellites in the Local Group and Other Nearby Groups
• Low-luminosity galaxies in the early universe have observed sizes similar to star cluster complexes