The cusp-core problem in gas-poor dwarf spheroidal galaxies

Abstract

This review deals with the inconsistency of inner dark matter density profiles in dwarf galaxies, known as the cusp-core problem. Particularly, we aim to focus on gas-poor dwarf galaxies. One of the most promising solutions to this cold dark matter small scale issue is the stellar feedback but it seems to be only designed for gas-rich dwarfs. However, in the regime of classical dwarfs, this core mechanism becomes negligible. Therefore, it is required to find solutions without invoking these baryonic processes as dark matter cores tend to persist even for these dwarfs, which are rather dark matter-dominated. Here we have presented two categories of solutions. One consists of creating dark matter cores from cusps within cold dark matter by altering the dark matter potential via perturbers. The second category gathers solutions which depict the natural emergence of dark matter cores in alternative theories. Given the wide variety of solutions, it becomes necessary to identify which mechanism dominates in the central region of galaxies by finding observational signatures left by them in order to highlight the true nature of dark matter.

Invited review, 28 pages, 16 figures, 1 table, 310 references. Accepted for publication in the special issue Challenges in Our Understanding of Dwarf Galaxies, edited by Yanbin Yang and Behnam Javanmardi, in Galaxies

References in corpus (53)

• Cosmic Star Formation History
• Ultralight scalars as cosmological dark matter
• Laser Interferometer Space Antenna
• Too big to fail? The puzzling darkness of massive Milky Way subhaloes
• Dark torsion as the cosmic speed-up
• Einstein's Other Gravity and the Acceleration of the Universe
• Cosmic Structure as the Quantum Interference of a Coherent Dark Wave
• High-Resolution Rotation Curves and Galaxy Mass Models from THINGS
• SPARC: Mass Models for 175 Disk Galaxies with Spitzer Photometry and Accurate Rotation Curves
• Understanding the Core-Halo Relation of Quantum Wave Dark Matter, $\psi$DM, from 3D Simulations
• The Observed properties of Dark Matter on small spatial scales
• High-resolution mass models of dwarf galaxies from LITTLE THINGS
• Cores in Dwarf Galaxies from Dark Matter with a Yukawa Potential
• Stellar Feedback in Dwarf Galaxy Formation
• f(T) gravity mimicking dynamical dark energy. Background and perturbation analysis
• The kinematic status and mass content of the Sculptor dwarf spheroidal galaxy
• A mass-dependent density profile for dark matter haloes including the influence of galaxy formation
• High-resolution dark matter density profiles of THINGS dwarf galaxies: Correcting for non-circular motions
• Axion dark matter, solitons, and the cusp-core problem
• Dwarf galaxies in CDM and SIDM with baryons: observational probes of the nature of dark matter
• Growth factor in f(T) gravity
• Ultra Light Boson Dark Matter and Event Horizon Telescope Observations of M87*
• First star-forming structures in fuzzy cosmic filaments
• Dynamical Centers and Non-Circular Motions in THINGS Galaxies: Implications for Dark Matter Halos
• Supermassive Black Holes from Ultra-Strongly Self-Interacting Dark Matter
• The shapes, orientation, and alignment of Galactic dark matter subhalos
• The mass and velocity anisotropy of the Carina, Fornax, Sculptor and Sextans dwarf spheroidal galaxies
• Dwarf Galaxy Dark Matter Density Profiles Inferred from Stellar and Gas Kinematics
• Dark Matter Heating and Early Core Formation in Dwarf Galaxies
• Dwarf Spheroidals in MOND
• Halo globular clusters observed with AAOmega: dark matter content, metallicity and tidal heating
• Early flattening of dark matter cusps in dwarf spheroidal galaxies
• SIDM on FIRE: Hydrodynamical Self-Interacting Dark Matter simulations of low-mass dwarf galaxies
• Cores and Cusps in the Dwarf Spheroidals
• Dark matters on the scale of galaxies
• The phase space density of fermionic dark matter haloes
• The core-cusp problem: a matter of perspective
• Determining the Nature of Dark Matter with Astrometry
• A Common Origin for Globular Clusters and Ultra-faint Dwarfs in Simulations of the First Galaxies
• Predictions and Outcomes for the Dynamics of Rotating Galaxies
• Traversable wormholes in $f(R)$ gravity with constant and variable redshift functions
• A semi-analytic dynamical friction model for cored galaxies
• Dark-Matter Decays and Self-Gravitating Halos
• 3D motions in the Sculptor dwarf galaxy as a glimpse of a new era
• The edge of galaxy formation I: formation and evolution of MW-satellites analogues before accretion
• The edge of galaxy formation II: evolution of Milky Way satellite analogues after infall
• A unified solution to the small scale problems of the $\Lambda$CDM model II: introducing parent-satellite interaction
• A dwarf-dwarf merger and dark matter core as a solution to the Globular Cluster problems in the Fornax dSph
• Primordial Black Holes as Dark Matter: Constraints From Compact Ultra-Faint Dwarfs
• N-body simulations of the Carina dSph in MOND
• Indirect Probes of Dark Matter and Globular Cluster Properties From Dark Matter Annihilation within the Coolest White Dwarfs
• Testing modified gravity with dwarf spheroidal galaxies
• Giant low-surface-brightness dwarf galaxy as a test bench for MOdified Gravity