Dark matter deficient galaxies in the Illustris flat-$\Lambda$CDM model structure formation simulation

Abstract

Surveying dark matter deficient galaxies (those with dark matter mass to stellar mass ratio $M_{\mathrm{dm}}/M_{\mathrm{star}}<1$) in the Illustris simulation of structure formation in the flat-$\Lambda$CDM cosmogony, we find $M_{\rm star} \approx 2 \times 10^8\, M_\sun$ galaxies that have properties similar to those ascribed by \citet{vanDokkumetal2018a} to the ultra-diffuse galaxy NGC1052-DF2. The Illustris simulation also contains more luminous dark matter deficient galaxies. Illustris galaxy subhalo 476171 is a particularly interesting outlier, a massive and very compact galaxy with $M_{\rm star} \approx 9 \times 10^{10}\, M_\sun$ and $M_{\mathrm{dm}}/M_{\mathrm{star}}\approx 0.1$ and a half-stellar-mass radius of $\approx 2$ kpc. If the Illustris simulation and the $\Lambda$CDM model are accurate, there are a significant number of dark matter deficient galaxies, including massive luminous compact ones. It will be interesting to observationally discover these galaxies, and to also more clearly understand how they formed, as they are likely to provide new insight into and constraints on models of structure formation and the nature of dark matter.

arXiv commentsubmitted

References in corpus (24)

• The clustering of galaxies in the completed SDSS-III Baryon Oscillation Spectroscopic Survey: cosmological analysis of the DR12 galaxy sample
• The Complete Light-curve Sample of Spectroscopically Confirmed Type Ia Supernovae from Pan-STARRS1 and Cosmological Constraints from The Combined Pantheon Sample
• Introducing the Illustris Project: Simulating the coevolution of dark and visible matter in the Universe
• Properties of galaxies reproduced by a hydrodynamic simulation
• Introducing the Illustris Project: the evolution of galaxy populations across cosmic time
• A model for cosmological simulations of galaxy formation physics
• Everything You Always Wanted To Know About The Cosmological Constant Problem (But Were Afraid To Ask)
• The Illustris simulation: the evolving population of black holes across cosmic time
• Hubble parameter measurement constraints on the cosmological deceleration-acceleration transition redshift
• A distance of 13 Mpc resolves the claimed anomalies of the galaxy lacking dark matter
• An improved model-independent assessment of the late-time cosmic expansion
• Using the tilted flat-$\Lambda$CDM and the untilted non-flat $\Lambda$CDM inflation models to measure cosmological parameters from a compilation of observational data
• Constraints on dark energy dynamics and spatial curvature from Hubble parameter and baryon acoustic oscillation data
• An enigmatic population of luminous globular clusters in a galaxy lacking dark matter
• The Beginning and Evolution of the Universe
• Observational constraints on the tilted spatially-flat and the untilted nonflat $\varphi$CDM dynamical dark energy inflation models
• Binned Hubble parameter measurements and the cosmological deceleration-acceleration transition
• Measuring the Hubble constant and spatial curvature from supernova apparent magnitude, baryon acoustic oscillation, and Hubble parameter data
• MOND and the dynamics of NGC1052-DF2
• Reconciling mass-estimates of ultra-diffuse galaxies
• First study of reionization in the Planck 2015 normalized closed $\Lambda$CDM inflation model
• Orbital decay of Globular Clusters in the galaxy with little dark matter
• Offline and Online calibration of Mobile Robot and SLAM Device for Navigation
• Independent Analysis of the Distance to NGC1052-DF2

Cited by in corpus (4)

• Self-Interacting Dark Matter and the Origin of Ultra-Diffuse Galaxies NGC1052-DF2 and -DF4
• The ultra-diffuse dwarf galaxies NGC 1052-DF2 and 1052-DF4 are in conflict with standard cosmology
• Dark-matter-deficient galaxies in hydrodynamical simulations
• Isolated dark matter deprived galaxies in hydrodynamical simulations: real objects or artefacts?