Formation of Transitional cE/UCD Galaxies through Massive/Dwarf Disc Galaxy Mergers
arXiv:2412.03100 · doi:10.3390/galaxies12010001
Abstract
The dynamics of the merger of a dwarf disc galaxy with a massive spiral galaxy of the Milky Way type have been studied in detail. The remnant of such interaction after numerous crossings of the satellite through the disc of the main galaxy is a compact stellar core, the characteristics of which are close to small compact elliptical galaxies (cEs) or large ultra-compact dwarfs (UCDs). Such transitional cE/UCD objects with an effective radius of 100-200 pc arise as a result of stripping the outer layers of the stellar core during the destruction of a disc dwarf galaxy. Numerical models of the satellite before interaction include baryonic matter (stars and gas) and dark mass. We use N-body to describe the dynamics of stars and dark matter and Smoothed-Particle Hydrodynamics to model the gas components of both galaxies. The direct method of calculating the gravitational force between all particles provides a qualitative resolution of spatial structures up to 10 pc. The simulated cE/UCD galaxies contain very little gas and dark matter at the end of their evolution.
28 pages, 16 figures
References in corpus (37)
- The Gaia mission
- Updated Nearby Galaxy Catalog
- Evidence for Two Early Accretion Events That Built the Milky Way Stellar Halo
- A Supermassive Black Hole in an Ultracompact Dwarf Galaxy
- From dawn till disk: Milky Way's turbulent youth revealed by the APOGEE+Gaia data
- The AIMSS Project I: Bridging the Star Cluster - Galaxy Divide
- The Nature of UCDs: Internal Dynamics from an Expanded Sample and Homogeneous Database
- The Fall of a Giant. Chemical evolution of Enceladus, alias the Gaia Sausage
- Hydrodynamical simulations of the galaxy population: enduring successes and outstanding challenges
- An almost head-on collision as the origin of two off-centre rings in the Andromeda galaxy
- Kinematics and stellar populations of the dwarf elliptical galaxy IC 3653
- Reconstructing the Disrupted Dwarf Galaxy -Sausage/Enceladus Using its Stars and Globular Clusters
- A Tale of Two Disks: Mapping the Milky Way with the Final Data Release of APOGEE
- The effect of the LMC on the Milky Way system
- GASP XVII. HI imaging of the jellyfish galaxy JO206: gas stripping and enhanced star formation
- Energy wrinkles and phase-space folds of the last major merger
- Stellar Population Constraints on the Dark Matter Content and Origin of Ultra-Compact Dwarf Galaxies
- Isolated compact elliptical galaxies: Stellar systems that ran away
- Discovery of a new M32-like "Compact Elliptical" galaxy in the halo of the Abell 496 cD galaxy
- How Unusual is the Milky Way's Assembly History?
- A search for active galactic nuclei in low-mass compact galaxies
- Detection of Enhanced Central Mass-to-Light Ratios in Low-Mass Early-Type Galaxies: Evidence for Black Holes?
- Low-mass compact elliptical galaxies: spatially-resolved stellar populations and kinematics with the Keck Cosmic Web Imager
- The Origin of Stars in the Inner 500 Parsecs in TNG50 Galaxies
- The formation pathways of compact elliptical galaxies
- A high fidelity Milky Way simulation with Kraken, Gaia-Enceladus, and Sequoia analogues: clues to their accretion histories
- Testing the tidal stripping scenario of ultra-compact dwarf galaxy formation by using internal properties
- Young Star-Forming Complexes in the Ring of the S0 galaxy NGC 4324
- M32 Analogs? A Population of Massive Ultra Compact Dwarf and Compact Elliptical Galaxies in intermediate redshift CLASH Clusters
- Star formation in outer rings of S0 galaxies. IV. NGC 254 -- a double-ringed S0 with gas counter-rotation
- The Influence of the Galactic Bar on the Dynamics of Globular Clusters
- Harnessing the Hubble Space Telescope Archives: A Catalogue of 21,926 Interacting Galaxies
- Spatial segregation impact on star formation in nearby dwarf spheroidal galaxies
- NGC 90: a hidden jelly-fish galaxy?
- A nearby isolated dwarf: star formation and structure of ESO 006-001
- The creation of a massive UCD by tidal threshing from NGC 936
- Observations of cold gas and star formation in dwarf S0 galaxies