Observational dynamics of low-mass stellar systems
arXiv:1405.7823 · doi:10.1002/asna.201412056
Abstract
The last fifteen years have seen the discovery of new types of low-mass stellar systems that bridge the gap between the once well-separated regimes of galaxies and of star clusters. Whether such objects are considered galaxies depends also on the definition of the term "galaxy", and several possible criteria are based on their internal dynamics (e.g. the common concept that galaxies contain dark matter). Moreover, studying the internal dynamics of low-mass stellar systems may also help understand their origin and evolutionary history. The focus of this paper is on two classes of stellar systems at the interface between star clusters and dwarf galaxies: ultra-compact dwarf galaxies (UCDs) and diffuse Galactic globular clusters (GCs). A review of our current knowledge on the properties of UCDs is provided and dynamical considerations applying to diffuse GCs are introduced. In the following, recent observational results on the internal dynamics of individual UCDs and diffuse Galactic globular clusters are presented.
15 pages, 6 figures; Doctoral Thesis Award Lecture 2013, to appear in AN / Reviews in Modern Astronomy, Vol. 26
References in corpus (27)
- The Dartmouth Stellar Evolution Database
- A systematic variation of the stellar initial mass function in early-type galaxies
- The Observed properties of Dark Matter on small spatial scales
- Gemini and Hubble Space Telescope Evidence for an Intermediate Mass Black Hole in omega Centauri
- Discovery and analysis of three faint dwarf galaxies and a globular cluster in the outer halo of the Andromeda galaxy
- From star clusters to dwarf galaxies: The properties of dynamically hot stellar systems
- Evidence for primordial mass segregation in globular clusters
- Dynamical masses of ultra-compact dwarf galaxies in Fornax
- A 2dF spectroscopic study of globular clusters in NGC 5128: Probing the formation history of the nearest giant Elliptical
- The ACS Virgo Cluster Survey. XIV. Analysis of Color-Magnitude Relations in Globular Cluster Systems
- Halo globular clusters observed with AAOmega: dark matter content, metallicity and tidal heating
- Kinematic Decoupling of Globular Clusters with Extended Horizontal-Branch
- Bright globular clusters in NGC 5128: the missing link between young massive clusters and evolved massive objects
- Structural Properties of Ultra-Compact Dwarf Galaxies in the Fornax and Virgo Clusters
- The formation of ultra-compact dwarf galaxies and nucleated dwarf galaxies
- Testing Fundamental Physics with Distant Star Clusters: Analysis of Observational Data on Palomar 14
- An extreme IMF as an explanation for high M/L ratios in UCDs? The CO index as a tracer of bottom heavy IMFs
- An Ultra Compact Dwarf around the Sombrero galaxy (M104): the Nearest Massive UCD
- High mass-to-light ratios of UCDs - Evidence for dark matter ?
- Scl-dE1 GC1: An Extended Globular Cluster in a Low-Luminosity Dwarf Elliptical Galaxy
- A search for ultra-compact dwarf galaxies in the Centaurus galaxy cluster
- Globular Clusters in the Outer Galactic Halo: AM-1 and Palomar 14
- Stellar Population Constraints on the Dark Matter Content and Origin of Ultra-Compact Dwarf Galaxies
- Using globular clusters to test gravity in the weak acceleration regime: NGC 7099
- UCD Candidates in the Hydra Cluster
- Radial Velocity and Metallicity of the Globular Cluster IC4499 Obtained with AAOmega
- Luminosity-Diameter Relations for Globular Clusters and Dwarf Spheroidal Galaxies