A Large Dark Matter Core in the Fornax Dwarf Spheroidal Galaxy?

Abstract

We use measurements of the stellar velocity dispersion profile of the Fornax dwarf spheroidal galaxy to derive constraints on its dark matter distribution. Though the data are unable to distinguish between models with small cores and those with cusps, we show that a large > 1 kpc dark matter core in Fornax is highly implausible. Irrespective of the origin of the core, reasonable dynamical limits on the mass of the Fornax halo constrain its core radius to be no larger than 700 pc. We derive an upper limit core radius of 300 pc by demanding that the central phase space density of Fornax not exceed that directly inferred from the rotation curves of low-mass spiral galaxies. Further, if the halo is composed of warm dark matter then phase-space constraints force the core to be quite small in order to avoid conservative limits from the Ly alpha forest power spectrum, implying a core radius < 85 pc. We discuss our results in the context of the idea that the extended globular cluster distribution in Fornax can be explained by the presence of a large 1.5 kpc core. A self-consistent core of this size would be drastically inconsistent with the expectations of standard warm or cold dark matter models, and would also require an unreasonably massive dark matter halo, with a maximum circular velocity of 200 km/s.

arXiv comment7 pages, 2 figures. Submitted to ApJ

References in corpus (46)

• The Structure of Cold Dark Matter Halos
• Dark Matter Substructure in Galactic Halos
• Where are the missing galactic satellites?
• Dwarf Galaxies of the Local Group
• Observational evidence for self-interacting cold dark matter
• Cold and Fuzzy Dark Matter
• Sterile Neutrinos as Dark Matter
• The Structure of Dark Matter Haloes in Dwarf Galaxies
• The Inner Structure of LambdaCDM Halos III: Universality and Asymptotic Slopes
• Constraining Warm Dark Matter candidates including sterile neutrinos and light gravitinos with WMAP and the Lyman-alpha forest
• Observational and Theoretical Constraints on Singular Dark Matter Halos
• A New Dark Matter Candidate: Non-thermal Sterile Neutrinos
• The Structure of Dark Matter Haloes in Hierarchical Clustering Models
• The tumultuous lives of galactic dwarfs and the missing satellites problem
• Mass Density Profiles of LSB Galaxies
• Sterile Neutrino Hot, Warm, and Cold Dark Matter
• Resolving the Structure of Cold Dark Matter Halos II
• Halo Substructure And The Power Spectrum
• Velocity and spatial biases in CDM subhalo distributions
• High-Resolution Measurements of the Halos of Four Dark Matter-Dominated Galaxies: Deviations from a Universal Density Profile
• The Phase-Space Density Profiles of Cold Dark Matter Halos
• The Milky Way's satellite population in a LambdaCDM universe
• Does the Fornax dwarf spheroidal have a central cusp or core?
• Density Profiles of Cold Dark Matter Substructure: Implications for the Missing Satellites Problem
• Formation and structure of halos in a warm dark matter cosmology
• Internal Kinematics of the Fornax Dwarf Spheroidal Galaxy
• Cusps in CDM halos
• New Dark Matter Physics: Clues from Halo Structure
• Observing the dark matter density profile of isolated galaxies
• Halo Cores and Phase Space Densities: Observational Constraints on Dark Matter Physics and Structure Formation
• Dark Matter from Early Decays
• Production and Evolution of Perturbations of Sterile Neutrino Dark Matter
• SuperWIMP Solutions to Small Scale Structure Problems
• Surface Brightness Profiles and Structural Parameters for Globular Clusters in the Fornax and Sagittarius Dwarf Spheroidal Galaxies
• Annihilating Cold Dark Matter
• Dark matter distribution in dwarf spheroidal galaxies
• Linear Cosmological Structure Limits on Warm Dark Matter
• Inflation, cold dark matter, and the central density problem
• Velocity bias in a LCDM model
• A Wide-Field Survey of the Fornax Dwarf Spheroidal Galaxy
• The Chemical Enrichment History of the Fornax Dwarf Spheroidal Galaxy from the Infrared Calcium Triplet
• Absolute Proper Motion of the Fornax Dwarf Spheroidal Galaxy from Photographic and HST WFPC2 Data
• Unstable Cold Dark Matter and the Cuspy Halo Problem in Dwarf Galaxies
• The Nature of the Density Clump in the Fornax Dwarf Spheroidal Galaxy
• The dark matter halos of the bluest low surface brightness galaxies
• Is a Simple Collisionless Relic Dark Matter Particle Ruled Out?

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