Ultra compact dwarf galaxies catalog Virtual Observatory Resource

Authors
  1. Fahrion K.
  2. Georgiev I.
  3. Hilker M.
  4. Lyubenova M.
  5. van de Ven G.,Alfaro-Cuello M.
  6. Corsini E.M.
  7. Sarzi M.
  8. McDermid R.M.
  9. de Zeeuw T.
  10. Published by
    CDS
Abstract

Photometric surveys of galaxy clusters have revealed a large number of ultra compact dwarfs (UCDs) around predominantly massive elliptical galaxies. Their origin is still debated as some UCDs are considered to be the remnant nuclei of stripped dwarf galaxies while others seem to mark the high-mass end of the star cluster population. We aim to characterize the properties of a UCD found at very close projected distance (r_wproj_=1.1kpc) from the centre of the low-mass (M~10^10^M_{sun}_) early-type galaxy FCC 47. This is a serendipitous discovery from MUSE adaptive optics science verification data. We explore the potential origin of this UCD as either a massive cluster or the remnant nucleus of a dissolved galaxy. We used archival Hubble Space Telescope data to study the photometric and structural properties of FCC 47-UCD1. In the MUSE data, the UCD is unresolved, but we used its spectrum to determine the radial velocity and metallicity. The surface brightness of FCC 47-UCD1 is best described by a single King profile with low concentration C=Rt/Rc~10 and large effective radius (r_eff_=24pc). Its integrated magnitude and blue colour (Mg=-10.55mag, (g-z)=1.46mag) combined with a metallicity of [M/H]=-1.12+/-0.10dex and an age >8Gyr obtained from the full fitting of the MUSE spectrum suggests a stellar population mass of M*=4.87x10^6^M_{sun}_. The low S/N of the MUSE spectrum prevents detailed stellar population analysis. Due to the limited spectral resolution of MUSE, we can only give an upper limit on the velocity dispersion ({sigma}<17km/s), and consequently on its dynamical mass (M_dyn_<1.3x10^7^M_{sun}_). The origin of the UCD cannot be constrained with certainty. The low metallicity, old age, and magnitude are consistent with a star cluster origin, whereas the extended size is consistent with an origin as the stripped nucleus of a dwarf galaxy with a initial stellar mass of a few 10^8^M_{sun}_.

Keywords
  1. Galaxies
  2. Catalogs
  3. Radial velocity
  4. Galaxy classification systems
Bibliographic source Bibcode
2019A&A...625A..50F
See also HTML
https://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/625/A50
IVOA Identifier IVOID
ivo://CDS.VizieR/J/A+A/625/A50
Document Object Identifer DOI
doi:10.26093/cds/vizier.36250050

Access

Web browser access HTML
http://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/625/A50
https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/625/A50
http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/625/A50
IVOA Table Access TAP
http://tapvizier.cds.unistra.fr/TAPVizieR/tap
Run SQL-like queries with TAP-enabled clients (e.g., TOPCAT).
IVOA Cone Search SCS
For use with a cone search client (e.g., TOPCAT).
http://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/625/A50/tableb1?
https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/625/A50/tableb1?
http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/625/A50/tableb1?

History

2019-05-09T09:05:21Z
Resource record created
2019-05-09T09:05:21Z
Created
2020-12-01T15:27:19Z
Updated

Contact

Name
CDS support team
Postal Address
CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France
E-Mail
cds-question@unistra.fr