Constraints on asteroid-mass primordial black holes in dwarf galaxies using Hubble Space Telescope photometry
Fuente:
arXiv
Gespeichert in:
| Hauptverfasser: | , , , , , , |
|---|---|
| Format: | Preprint |
| Veröffentlicht: |
2025
|
| Schlagworte: | |
| Online-Zugang: | |
| Tags: |
Tag hinzufügen
Keine Tags, Fügen Sie den ersten Tag hinzu!
|
| _version_ | 1866911031092051968 |
|---|---|
| author | Esser, Nicolas Filion, Carrie De Rijcke, Sven Kallivayalil, Nitya Richstein, Hannah Tinyakov, Peter Wyse, Rosemary F. G. |
| author_facet | Esser, Nicolas Filion, Carrie De Rijcke, Sven Kallivayalil, Nitya Richstein, Hannah Tinyakov, Peter Wyse, Rosemary F. G. |
| contents | 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 $10^{19}$g are excluded at the $2σ$ ($3σ$) level from constituting more than $\sim55\%$ ($\sim78\%$) of the dark matter, while the possibility that PBHs represent the entirety of the DM is excluded at the $3.7σ$ level. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2503_03352 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Constraints on asteroid-mass primordial black holes in dwarf galaxies using Hubble Space Telescope photometry Esser, Nicolas Filion, Carrie De Rijcke, Sven Kallivayalil, Nitya Richstein, Hannah Tinyakov, Peter Wyse, Rosemary F. G. Astrophysics of Galaxies Cosmology and Nongalactic Astrophysics High Energy Astrophysical Phenomena 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 $10^{19}$g are excluded at the $2σ$ ($3σ$) level from constituting more than $\sim55\%$ ($\sim78\%$) of the dark matter, while the possibility that PBHs represent the entirety of the DM is excluded at the $3.7σ$ level. |
| title | Constraints on asteroid-mass primordial black holes in dwarf galaxies using Hubble Space Telescope photometry |
| topic | Astrophysics of Galaxies Cosmology and Nongalactic Astrophysics High Energy Astrophysical Phenomena |
| url | https://arxiv.org/abs/2503.03352 |