Scl-dE1 GC1: An Extended Globular Cluster in a Low-Luminosity Dwarf Elliptical Galaxy
arXiv:0903.0215 · doi:10.1088/0004-6256/137/5/4361
Abstract
We report the discovery from Hubble Space Telescope ACS images of an extended globular cluster, denoted by Scl-dE1 GC1, in the Sculptor Group dwarf Elliptical galaxy Scl-dE1 (Sc22). The distance of the dE is determined as 4.3 +/- 0.25 Mpc from the I magnitude of the tip of the red giant branch in the color-magnitude diagram. At this distance the half-light radius of Scl-dE1 GC1 is ~22 pc, placing it among the largest clusters known, particularly for globular clusters associated with dwarf galaxies. The absolute magnitude of Scl-dE1 GC1 is Mv = -6.7 and, to within the photometric uncertainties of the data, the cluster stellar population appears indistinguishable from that of the dE. We suggest that there may be two modes of globular cluster formation in dwarf galaxies, a "normal" mode with half-light radii of typically 3 pc, and an "extended" mode with half-light radii of ~10 pc or more.
18 pages, 5 figures, 1 Table. Accepted for publication in the Astronomical Journal
References in corpus (40)
- Maps of Dust IR Emission for Use in Estimation of Reddening and CMBR Foregrounds
- The Photometric Performance and Calibration of the HST Advanced Camera For Surveys
- Cats and Dogs, Hair and A Hero: A Quintet of New Milky Way Companions
- Destruction of the Galactic Globular Cluster System
- A comprehensive Maximum Likelihood analysis of the structural properties of faint Milky Way satellites
- The Observed properties of Dark Matter on small spatial scales
- A New Milky Way Companion: Unusual Globular Cluster or Extreme Dwarf Satellite?
- Tip of the Red Giant Branch Distances. II. Zero-Point Calibration
- M31 Globular Clusters: Colors and Metallicities
- The ACS Virgo Cluster Survey X. Half-light Radii of Globular Clusters in Early-Type Galaxies: Environmental Dependencies and a Standard Ruler for Distance Estimation
- Distances to Nearby Galaxies in Sculptor
- Age Determination of Six Intermediate-age SMC Star Clusters with HST/ACS
- A Pair of Bootes: A New Milky Way Satellite
- Comparing the properties of local globular cluster systems: implications for the formation of the Galactic halo
- Effects of Tidal Shocks on the Evolution of Globular Clusters
- Variations in Stellar Clustering with Environment: Dispersed Star Formation and the Origin of Faint Fuzzies
- A new population of extended, luminous star clusters in the halo of M31
- SBF Distances to Dwarf Elliptical Galaxies in the Sculptor Group
- The discovery of two extremely low luminosity Milky Way globular clusters
- Globular clusters and the formation of the outer Galactic halo
- Structural parameters for globular clusters in M31 and generalizations for the fundamental plane
- The Globular Cluster Luminosity Function and Specific Frequency in Dwarf Elliptical Galaxies
- Globular Cluster Systems in Nearby Dwarf Galaxies: I. HST/ACS Observations and Dynamical Properties of Globular Clusters at Low Environmental Density
- The ACS Virgo Cluster Survey XI. The Nature of Diffuse Star Clusters in Early-Type Galaxies
- Dwarf Elliptical Galaxies in the M81 Group: The Structure and Stellar Populations of BK5N and F8D1
- The Globular Cluster Systems of Five Nearby Spiral Galaxies: New Insights from Hubble Space Telescope Imaging
- ACS photometry of extended, luminous globular clusters in the outskirts of M31
- Basic N-Body Modelling of the Evolution of Globular Clusters. I. Time Scaling
- Comparison of Distances from RR Lyrae Stars, the Tip of the Red-Giant Branch and Classical Cepheids
- Whiting 1: the youngest globular cluster associated with the Sgr dSph
- {HST Studies of the WLM Galaxy. II. The Star Formation History from Field Stars
- New Members of the Cluster Family in Nearby Lenticulars
- Hubble Space Telescope Imaging of Globular Cluster Candidates in Low Surface Brightness Dwarf Galaxies
- Structural parameters for globular clusters in NGC 5128. III. ACS surface-brightness profiles and model fits
- Detection of neutral hydrogen in early-type dwarf galaxies of the Sculptor Group
- An extended star cluster at the outer edge of the spiral galaxy M33
- Structural Parameters from Ground-based Observations of Newly Discovered Globular Clusters in NGC 5128
- Sizes of Confirmed Globular Clusters in NGC 5128: A Wide-Field High-Resolution Study
- WLM-1: A Non-Rotating, Gravitationally Unperturbed, Highly Elliptical Extragalactic Globular Cluster
- Luminosity-Diameter Relations for Globular Clusters and Dwarf Spheroidal Galaxies
Cited by in corpus (43)
- Precession of the Sagittarius stream
- The Relationships Among Compact Stellar Systems: A Fresh View of Ultra Compact Dwarfs
- Wide-Field Precision Kinematics of the M87 Globular Cluster System
- Evidence for an accretion origin for the outer halo globular cluster system of M31
- Extending the Globular Cluster System-Halo Mass Relation to the Lowest Galaxy Masses
- The outer halo globular cluster system of M31 - I. The final PAndAS catalogue
- Deep imaging of Eridanus II and its lone star cluster
- Exploring the Properties of the M31 Halo Globular Cluster System
- The ACS Fornax Cluster Survey VII. Half-Light Radii of Globular Clusters in Early-Type Galaxies
- Local-Density Driven Clustered Star Formation
- Diamonds on the Hat: Globular Clusters in The Sombrero Galaxy (M104)
- A parametric study on the formation of extended star clusters and ultra-compact dwarf galaxies
- Ultra-Compact Dwarfs in the Coma Cluster
- Extended Star Clusters in the Remote Halo of the Intriguing Dwarf Galaxy NGC 6822
- Tracing satellite planes in the Sculptor group: I. Discovery of three faint dwarf galaxies around NGC 253
- The outer halo globular cluster system of M31 - III. Relationship to the stellar halo
- Wide-Field Hubble Space Telescope Observations of the Globular Cluster System in NGC1399
- The Size Scale of Star Clusters
- Massive star clusters in galaxies
- The globular cluster system of the Milky Way: accretion in a cosmological context
- The Next Generation Virgo Cluster Survey. XXXIV. Ultra-Compact Dwarf (UCD) Galaxies in the Virgo Cluster
- A Catalog of Extended Clusters and Ultra-Compact Dwarf Galaxies - An Analysis of their Parameters in Early- and Late-Type Galaxies
- N-body Models of Extended Clusters
- Probing the boundary between star clusters and dwarf galaxies: A MUSE view on the dynamics of Crater/Laevens I
- Ultra compact dwarfs in the Perseus Cluster: UCD formation via tidal stripping
- Are Some Milky Way Globular Clusters Hosted by Undiscovered Galaxies?
- Structured star formation in the Magellanic inter-Cloud region
- DDO216-A1: a central globular cluster in a low-luminosity transition type galaxy
- New Insight into the stellar mass function of Galactic globular clusters
- A New Formation Scenario for the Milky Way Cluster NGC2419
- A peculiar faint satellite in the remote outer halo of M31
- Constraining the initial conditions of globular clusters using their radius distribution
- The faint globular cluster in the dwarf galaxy Andromeda I
- Nuclei of dwarf spheroidal galaxies KKs3 and ESO269-66 and their counterparts in our Galaxy
- A faint extended cluster in the outskirts of NGC 5128: evidence of a low mass accretion
- The ACS Fornax Cluster Survey. XII. Diffuse Star Clusters in Early-type Galaxies
- The spatial distribution of globular clusters in dwarf spheroidal galaxies and the timing problem
- Statistical analysis of dwarf galaxies and their globular clusters in the Local Volume
- Star Cluster collisions - a formation scenario for the Extended Globular Cluster Scl-dE1 GC1
- No globular cluster progenitors in Milky Way satellite galaxies
- Population gradients and photometric metallicities in early- and transition-type dwarf galaxies: Clues from the Sculptor group
- Low-density star cluster formation: discovery of a young faint fuzzy on the outskirts of the low-mass spiral galaxy NGC 247
- Observational dynamics of low-mass stellar systems