Clues to the nature of ultra diffuse galaxies from estimated galaxy velocity dispersions
arXiv:1609.08169 · doi:10.1093/mnrasl/slw198
Abstract
We describe how to estimate the velocity dispersions of ultra diffuse galaxies, UDGs, using a previously defined galaxy scaling relationship. The method is accurate for the two UDGs with spectroscopically measured dispersions, as well as for ultra compact galaxies, ultra faint galaxies, and stellar systems with little or no dark matter. This universality means that the relationship can be applied without further knowledge or prejudice regarding the structure of a galaxy. We then estimate the velocity dispersions of UDGs drawn from two published samples and examine the distribution of total masses. We find, in agreement with the previous studies of two individual UDGs, that these systems are dark matter dominated systems, and that they span a range of at least . These galaxies are not, as an entire class, either all dwarfs or all failed galaxies. Estimates of the velocity dispersions can also help identify interesting subsets of UDGs, such as those that are likely to have the largest mass-to-light ratios, for subsequent spectroscopic study.
arXiv comment4 pages, accepted for publication in MNRAS Letters (typographical error in Equation 1 corrected)
References in corpus (24)
- A Universal Density Profile from Hierarchical Clustering
- The observed properties of dwarf galaxies in and around the Local Group
- Searching for Dark Matter Annihilation from Milky Way Dwarf Spheroidal Galaxies with Six Years of Fermi-LAT Data
- Resolved Massive Star Clusters in the Milky Way and its Satellites: Brightness Profiles and a Catalogue of Fundamental Parameters
- Accurate masses for dispersion-supported galaxies
- Eight New Milky Way Companions Discovered in First-Year Dark Energy Survey Data
- Eight Ultra-faint Galaxy Candidates Discovered in Year Two of the Dark Energy Survey
- Forty-Seven Milky Way-Sized, Extremely Diffuse Galaxies in the Coma Cluster
- The Mass-Concentration-Redshift Relation of Cold and Warm Dark Matter Halos
- A High Stellar Velocity Dispersion and ~100 Globular Clusters for the Ultra Diffuse Galaxy Dragonfly 44
- Galaxies at the extremes: Ultra-diffuse galaxies in the Virgo Cluster
- Unveiling a Rich System of Faint Dwarf Galaxies in the Next Generation Fornax Survey
- An overmassive Dark Halo around an Ultra-diffuse Galaxy in the Virgo Cluster
- The Nature of UCDs: Internal Dynamics from an Expanded Sample and Homogeneous Database
- Spatial distribution of ultra-diffuse galaxies within large-scale structures
- 3D modeling of GJ1214b's atmosphere: vertical mixing driven by an anti-Hadley circulation
- The Fundamental Manifold of Spheroids
- The Velocity Function of Galaxies
- Toward Equations of Galactic Structure
- Local Group Dwarf Galaxies and the Fundamental Manifold of Spheroids
- Evidence for Two Distinct Stellar Initial Mass Functions
- Evidence for Two Distinct Stellar Initial Mass Functions : Probing for Clues to the Dichotomy
- On the tidal radius of satellites on prograde and retrograde orbits
- Evidence for Two Distinct Stellar Initial Mass Functions : Revisiting the Effects of Cluster Dynamical Evolution
Cited by in corpus (33)
- (Almost) Dark Galaxies in the ALFALFA Survey: Isolated HI Bearing Ultra Diffuse Galaxies
- Spatial distribution of ultra-diffuse galaxies within large-scale structures
- Extensive Globular Cluster Systems Associated with Ultra Diffuse Galaxies in the Coma Cluster
- The Formation of Ultra-Diffuse Galaxies in Clusters
- The abundance of ultra-diffuse galaxies from groups to clusters: UDGs are relatively more common in more massive haloes
- The globular cluster systems of 54 Coma ultra-diffuse galaxies: statistical constraints from HST data
- The Next Generation Virgo Cluster Survey (NGVS). XXX. Ultra-Diffuse Galaxies and their Globular Cluster Systems
- The Formation of Isolated Ultra-Diffuse Galaxies in Romulus25
- Systematically Measuring Ultra Diffuse Galaxies (SMUDGes). I. Survey Description and First Results in the Coma Galaxy Cluster and Environs
- Spectroscopic characterisation of the stellar content of ultra diffuse galaxies
- Ultra-diffuse galaxies in the Auriga simulations
- Evidence for Ultra-Diffuse Galaxy `Formation' Through Galaxy Interactions
- Implications for Galaxy Formation Models from Observations of Globular Clusters around Ultra-Diffuse Galaxies
- Atomic Gas in Blue Ultra Diffuse Galaxies around Hickson Compact Groups
- One hundred SMUDGes in S-PLUS: ultra-diffuse galaxies flourish in the field
- A first constraint on the average mass of ultra diffuse galaxies from weak gravitational lensing
- Deep Subaru Hyper Suprime-Cam observations of Milky Way satellites Columba I and Triangulum II
- Systematically Measuring Ultra Diffuse Galaxies in HI: Results from the Pilot Survey
- Detection of a Large Population of Ultra Diffuse Galaxies in Massive Galaxy Clusters: Abell S1063 and Abell 2744
- On the Properties of Spectroscopically-Confirmed Ultra-Diffuse Galaxies Across Environment
- The Nature of Ultra-diffuse Galaxies in Distant Massive Galaxy Clusters: Abell 370 in the Hubble Frontier Fields
- A Virgo Environmental Survey Tracing Ionised Gas Emission (VESTIGE).XIII. The role of ram-pressure stripping in transforming the diffuse and ultra-diffuse galaxies in the Virgo cluster
- Edge-on HI-bearing ultra diffuse galaxy candidates in the 40% ALFALFA catalog
- Stellar content, planetary nebulae, and globular clusters of [KKS2000]04 (NGC1052-DF2)
- Keck Spectroscopy of the Coma Cluster Ultra-Diffuse Galaxy Y358: Dynamical Mass in a Wider Context
- Dark Matter and HI in Ultra-Diffuse Galaxy UGC 2162
- The virial mass distribution of ultra-diffuse galaxies in clusters and groups
- Constraining the dark matter halo mass of isolated low-surface-brightness galaxies
- Unravelling the enigmatic ISM conditions in Minkowski's Object
- Are Over-massive Haloes of Ultra Diffuse Galaxies Consistent with Extended MOND?
- Resolved HI in two ultra-diffuse galaxies from contrasting non-cluster environments
- HIPASS study of southern ultradiffuse galaxies and low surface brightness galaxies
- Revisiting the relation between the number of globular clusters and galaxy mass for low mass galaxies