Constraints on Dark Matter from Dynamical Heating of Stars in Ultrafaint Dwarfs. Part 1: MACHOs and Primordial Black Holes

Abstract

We place limits on dark matter made up of compact objects significantly heavier than a solar mass, such as MACHOs or primordial black holes (PBHs). In galaxies, the gas of such objects is generally hotter than the gas of stars and will thus heat the gas of stars even through purely gravitational interactions. Ultrafaint dwarf galaxies (UFDs) maximize this effect. Observations of the half-light radius in UFDs thus place limits on MACHO dark matter. We build upon previous constraints with an improved heating rate calculation including both direct and tidal heating, and consideration of the heavier mass range above $10^4{M}_{\odot }$. Additionally we find that MACHOs may lose energy and migrate in to the center of the UFD, increasing the heat transfer to the stars. UFDs can constrain MACHO dark matter with masses between about $10M_{\odot }$ and $10^8{M}_{\odot }$ and these are the strongest constraints over most of this range.

19 Pages, 6 Figures

References in corpus (9)

• Limits on the Macho Content of the Galactic Halo from the EROS-2 Survey of the Magellanic Clouds
• Constraints on Earth-mass primordial black holes from OGLE 5-year microlensing events
• Disruption of Dark Matter Substructure: Fact or Fiction?
• Understanding caustic crossings in giant arcs: characteristic scales, event rates, and constraints on compact dark matter
• An extended halo around an ancient dwarf galaxy
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• Constraints on Dark Matter from Dynamical Heating of Stars in Ultrafaint Dwarfs. Part 2: Substructure and the Primordial Power Spectrum
• Constraining axion and compact dark matter with interstellar medium heating
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Cited by in corpus (13)

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• Coherent Self-Interactions of Dark Matter in the Bullet Cluster
• Dancing with invisible partners: Three-body exchanges with primordial black holes
• Can Dark Stars account for the star formation efficiency excess at very high redshifts?
• Constraints on the Sharpness of the Curvature Power Spectrum
• Stellar Mass Segregation in Dark Matter Halos
• Constraints on Long-Ranged Interactions Between Dark Matter and the Standard Model
• Primordial Black Hole Mergers as Probes of Dark Matter in Galactic Center
• Immortality through the dark forces: Dark-charge primordial black holes as dark matter candidates
• A new probe of dark matter-baryon interactions in compact stellar systems
• Unified Gas Heating Constraints on Extended Dark Matter Compact Objects
• Fast and Fewrious: Stochastic binary perturbations from fast compact objects