Dark Matter Deficient Galaxies Produced via High-velocity Galaxy Collisions in High-resolution Numerical Simulations

  title={Dark Matter Deficient Galaxies Produced via High-velocity Galaxy Collisions in High-resolution Numerical Simulations},
  author={Eunjee Shin and Mi Ok Jung and Go Eun Kwon and Ji-hoon Kim and Joohyun Lee and Yongseok Jo and Boon Kiat Oh},
  journal={arXiv: Astrophysics of Galaxies},
The recent discovery of diffuse dwarf galaxies that are deficient in dark matter appears to challenge the current paradigm of structure formation in our Universe. We describe the numerical experiments to determine if the so-called dark matter deficient galaxies (DMDGs) could be produced when two gas-rich, dwarf-sized galaxies collide with a high relative velocity of $\sim 300\,{\rm kms^{-1}}$. Using idealized high-resolution simulations with both mesh-based and particle-based gravito… 
Dark Matter Deficient Galaxies and Their Member Star Clusters Form Simultaneously during High-velocity Galaxy Collisions in 1.25 pc Resolution Simulations
How diffuse dwarf galaxies that are deficient in dark matter—such as NGC1052-DF2 and NGC1052-DF4—formed remains a mystery. Along with their luminous member globular clusters (GCs), the so-called dark
The formation of dark-matter-deficient galaxies through galaxy collisions
In the standard galaxy formation model, cold dark matter (CDM) drives the hierarchical structure formation. However, recently it is suggested that the satellite galaxy NGC1052-DF2, a member of the
Creating a galaxy lacking dark matter in a dark matter-dominated universe
We use hydrodynamical cosmological simulations to show that it is possible to create, via tidal interactions, galaxies lacking dark matter in a dark matter dominated universe. We select dwarf
Dark matter-deficient dwarf galaxies form via tidal stripping of dark matter in interactions with massive companions
In the standard Lambda-CDM paradigm, dwarf galaxies are expected to be dark-matter-rich, as baryonic feedback is thought to quickly drive gas out of their shallow potential wells and quench star
A trail of dark-matter-free galaxies from a bullet-dwarf collision
The ultra-diffuse galaxies DF2 and DF4 in the NGC 1052 group share several unusual properties: they both have large sizes1, rich populations of overluminous and large globular clusters2–6, and very
Galaxies lacking dark matter produced by close encounters in a cosmological simulation
The standard cold dark matter plus cosmological constant model predicts that galaxies form within dark-matter haloes, and that low-mass galaxies are more dark-matter dominated than massive ones. The
The role of mergers and interactions in driving the evolution of dwarf galaxies over cosmic time
Dwarf galaxies (M*<10^9 Msun) are key drivers of mass assembly in high mass galaxies, but relatively little is understood about the assembly of dwarf galaxies themselves. Using the
How Metals Are Transported in and out of a Galactic Disk: Dependence on the Hydrodynamic Schemes in Numerical Simulations
Metallicity is a fundamental probe for understanding the baryon physics in a galaxy. Since metals are intricately associated with radiative cooling, star formation, and stellar feedback, reproducing
On the Evolution of the Globular Cluster System in NGC 1052-DF2: Dynamical Friction, Globular–Globular Interactions, and Galactic Tides
The ultra-diffuse galaxy NGC 1052-DF2 has an overabundance of luminous globular clusters (GCs), and its kinematics is consistent with the presence of little to no dark matter. As the velocity
Flattening of Dark Matter Cusps during Mergers: Model of M31
We run high-resolution fully GPU N-body simulations to demonstrate that the dark matter (DM) distribution in M31 is well fitted by a core-like profile. Rich observational data especially on the giant


Dark-matter-deficient galaxies in hydrodynamical simulations
Low-mass galaxies are expected to be dark-matter-dominated even within their central regions. Recently, two observations reported two dwarf galaxies in a group environment with very little dark
Further evidence for a population of dark-matter-deficient dwarf galaxies
In the standard cosmological model, dark matter drives the structure formation of galaxies and constructs potential wells within which galaxies may form. The baryon fraction in dark halos can reach
Galaxies lacking dark matter in the Illustris simulation
Context. Any viable cosmological model in which galaxies interact predicts the existence of primordial and tidal dwarf galaxies (TDGs). In particular, in the standard model of cosmology (ΛCDM),
Tidal stripping as a possible origin of the ultra diffuse galaxy lacking dark matter
  • G. Ogiya
  • Physics
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  • 2018
Recent observations revealed a mysterious ultra diffuse galaxy, NGC1052-DF2, in the group of a large elliptical galaxy, NGC1052. Compared to expectations from abundance matching models, the dark
High-redshift Galaxy Formation with Self-consistently Modeled Stars and Massive Black Holes: Stellar Feedback and Quasar Growth
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Formation of globular cluster candidates in merging proto-galaxies at high redshift: a view from the FIRE cosmological simulations
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Tidal dwarf galaxies in cosmological simulations
The formation and evolution of gravitationally bound, star forming substructures in tidal tails of interacting galaxies, called tidal dwarf galaxies (TDG), has been studied, until now, only in
Populating a cluster of galaxies - I. Results at z=0
ABSTRA C T We simulate the assembly of a massive rich cluster and the formation of its constituent galaxies in a flat, low-density universe. Our most accurate model follows the collapse, the star
Ultra-diffuse galaxies without dark matter
  • J. Silk
  • Physics
    Monthly Notices of the Royal Astronomical Society: Letters
  • 2019
I develop a high-velocity galaxy collision model to explain a rare but puzzling phenomenon, namely the apparent existence of ultra-diffuse galaxies with little dark matter. Predictions include