Constraints on asteroid-mass primordial black holes in dwarf galaxies using Hubble Space Telescope photometry
arXiv:2503.03352 · doi:10.1051/0004-6361/202554687
Abstract
Primordial black holes (PBHs) in the asteroid-mass range remain a viable and until now unconstrained dark matter (DM) candidate. If such PBHs exist, they could be captured by stars in DM-dominated environments with low velocity dispersion such as ultra-faint dwarf galaxies (UFDs). The capture probability increases with the stellar mass, and captured PBHs would rapidly destroy their host stars. As a result, the presence of PBHs in UFDs would alter their stellar mass functions. Using photometric observations of three ultra-faint dwarf galaxies from the Hubble Space Telescope, we show that it is unlikely that their mass functions have been significantly modified by PBHs, and we place constraints on the PBH abundance. In the ultra-faint dwarf galaxy Triangulum II, PBHs around g are excluded at the () level from constituting more than () of the dark matter, while the possibility that PBHs represent the entirety of the DM is excluded at the level.
Updated to match version published in A&A
References in corpus (33)
- A Universal Density Profile from Hierarchical Clustering
- Galactic Stellar and Substellar Initial Mass Function
- On the variation of the Initial Mass Function
- A Survey of Stellar Families: Multiplicity of Solar-Type Stars
- The Dartmouth Stellar Evolution Database
- A Universal Stellar Initial Mass Function? A Critical Look at Variations
- Cats and Dogs, Hair and A Hero: A Quintet of New Milky Way Companions
- Extragalactic Science, Cosmology and Galactic Archaeology with the Subaru Prime Focus Spectrograph (PFS)
- The Faintest Dwarf Galaxies
- R-process enrichment from a single event in an ancient dwarf galaxy
- A Complete Spectroscopic Survey of the Milky Way Satellite Segue 1: The Darkest Galaxy
- INTEGRAL constraints on primordial black holes and particle dark matter
- The Close Binary Fraction of Solar-type Stars is Strongly Anti-correlated with Metallicity
- The Stellar Initial Mass Function of Ultra-Faint Dwarf Galaxies: Evidence for IMF Variations with Galactic Environment
- A MegaCam Survey of Outer Halo Satellites. III. Photometric and Structural Parameters
- The Orbital Histories of Magellanic Satellites Using Gaia DR2 Proper Motions
- Stellar Kinematics and Metallicities in the Ultra-Faint Dwarf Galaxy Reticulum II
- Overview of the DESI Milky Way Survey
- Direct Detection of Hawking Radiation from Asteroid-Mass Primordial Black Holes
- Triangulum II: Not Especially Dense After All
- Constraints on primordial black holes as dark matter candidates from star formation
- Evidence of a non universal stellar Initial Mass Function. Insights from HST optical imaging of 6 Ultra Faint Dwarf Milky Way Satellites
- Star Formation Histories of Ultra-Faint Dwarf Galaxies: environmental differences between Magellanic and non-Magellanic satellites?
- Adiabatic contraction revisited: implications for primordial black holes
- The statistical challenge of constraining the low-mass IMF in Local Group dwarf galaxies
- Close encounters of the primordial kind: a new observable for primordial black holes as dark matter
- The initial mass function in the Coma Berenices dwarf galaxy from deep near-infrared HST observations
- Timing the r-Process Enrichment of the Ultra-Faint Dwarf Galaxy Reticulum II
- Constraints on primordial black holes from observation of stars in dwarf galaxies
- The Rich Lack Close Neighbours: The Dependence of Blue-Straggler Fraction on Metallicity
- Faint Stars in a Faint Galaxy: II. The Low Mass Stellar Initial Mass Function of the Boötes I Ultrafaint Dwarf Spheroidal Galaxy
- The Low-Mass Stellar Initial Mass Function in Nearby Ultrafaint Dwarf Galaxies
- Picolensing as a Probe of Primordial Black Hole Dark Matter