Improved constraints from ultra-faint dwarf galaxies on primordial black holes as dark matter

Abstract

Soon after the recent first ever detection of gravitational waves from merging black holes it has been suggested that their origin is primordial. Appealingly, a sufficient number of primordial black holes (PBHs) could also partially or entirely constitute the dark matter (DM) in the Universe. However, recent studies on PBHs in ultra-faint dwarf galaxies (UFDGs) suggest that they would dynamically heat up the stellar component due to two-body relaxation processes. From the comparison with the observed stellar velocity dispersions and the stellar half-light radii it was claimed that only PBHs with masses $\lesssim 10M_{\odot }$ can significantly contribute to the DM. In this work, we improve the latter constraints by considering the largest observational sample of UFDGs and by allowing the PBH masses to follow an extended (log-normal) distribution. By means of collisional Fokker-Planck simulations, we explore a wide parameter space of UFDGs containing PBHs. The analysis of the half-light radii and velocity dispersions resulting from the simulations leads to three general findings that exclude PBHs with masses $\sim \mathcal{O}(1$-$100)M_{\odot }$ from constituting all of the DM: (i) We identify a critical sub-sample of UFDGs that only allows for $\sim \mathcal{O}(1)M_{\odot }$ PBH masses; (ii) for any PBH mass, there is an UFDG in our sample that disfavours it; (iii) the spatial extensions of a majority of simulated UFDGs containing PBHs are too large to match the observed.

References in corpus (19)

• Primordial Black Holes as Dark Matter
• The Kinematics of the Ultra-Faint Milky Way Satellites: Solving the Missing Satellite Problem
• Limits on the Macho Content of the Galactic Halo from the EROS-2 Survey of the Magellanic Clouds
• Cosmic microwave background limits on accreting primordial black holes
• Microlensing and dynamical constraints on primordial black hole dark matter with an extended mass function
• The end of the MACHO era- revisited: new limits on MACHO masses from halo wide binaries
• Farthest Neighbor: The Distant Milky Way Satellite Eridanus II
• A New Faint Milky Way Satellite Discovered in the Pan-STARRS1 3 pi Survey
• A spectroscopic confirmation of the Bootes II dwarf spheroidal
• A Hero's Dark Horse: Discovery of an Ultra-Faint Milky Way Satellite in Pegasus
• Limits on the Mass and Abundance of Primordial Black Holes from Quasar Gravitational Microlensing
• A new Fokker-Planck approach for relaxation-driven evolution of galactic nuclei
• A Suprime-Cam study of the stellar population of Ursa Major I dwarf spheroidal galaxy
• Portrait of a Dark Horse: a Photometric and Spectroscopic Study of the Ultra-faint Milky Way Satellite Pegasus III
• A new look at microlensing limits on dark matter in the Galactic halo
• Dynamical evidence for a strong tidal interaction between the Milky Way and its satellite, Leo V
• Cusp-to-core transition in low-mass dwarf galaxies induced by dynamical heating of cold dark matter by primordial black holes
• Primordial Black Holes as Dark Matter: Constraints From Compact Ultra-Faint Dwarfs
• Hubble Space Telescope Imaging of the Active Dwarf Galaxy RGG 118

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• Dehnen halo effect on a black hole in an ultra-faint dwarf galaxy
• Primordial Black Holes
• Could the 2.6 $M_{\odot }$ object in GW190814 be a primordial black hole?
• Eliminating the LIGO bounds on primordial black hole dark matter
• Snowmass2021 Cosmic Frontier White Paper:Primordial Black Hole Dark Matter
• Constraints on Dark Matter from Dynamical Heating of Stars in Ultrafaint Dwarfs. Part 2: Substructure and the Primordial Power Spectrum
• Tidal disruption events in post-starburst galaxies: the importance of a complete stellar mass function
• Partial stellar tidal disruption events and their rates
• Constraints on Dark Matter from Dynamical Heating of Stars in Ultrafaint Dwarfs. Part 1: MACHOs and Primordial Black Holes
• The Milky Way, Coming into Focus: Precision Astrometry Probes its Evolution, and its Dark Matter
• Generation of gravitational waves and tidal disruptions in clumpy galaxies
• Geodesics and scalar perturbations of Schwarzschild black holes embedded in a Dehnen-type dark matter halo with quintessence
• The limits of cosmology: role of the Moon
• The History of Primordial Black Holes
• The MUSE-Faint survey: I. Spectroscopic evidence for a star cluster in Eridanus 2 and constraints on MACHOs as a constituent of dark matter
• Coherent Self-Interactions of Dark Matter in the Bullet Cluster
• Dancing with invisible partners: Three-body exchanges with primordial black holes
• Limits on Primordial Black Holes from M87
• Gravitational radiation reaction around a static black hole surrounded by a Dehnen type dark matter halo
• Constraints on Long-Ranged Interactions Between Dark Matter and the Standard Model
• Immortality through the dark forces: Dark-charge primordial black holes as dark matter candidates
• Linearity: galaxy formation encounters an unanticipated empirical relation
• Hierarchical Merger of Primordial Black Holes in Dwarf Galaxies
• Through Andromeda and Beyond: AGN Optical Transient 'Sharov21' Revisited
• Gravitational Waves from Hyperbolic Encounters of Primordial Black Holes in Dwarf Galaxies