2025-10-16 ジョンズ・ホプキンス大学（JHU）
＜関連情報＞
- https://hub.jhu.edu/2025/10/16/mysterious-glow-in-milky-way-dark-matter/
- https://journals.aps.org/prl/abstract/10.1103/g9qz-h8wd
天の川銀河のシミュレーションにおけるフェルミ-LAT銀河中心の暗黒物質の過剰形態 Fermi-LAT Galactic Center Excess Morphology of Dark Matter in Simulations of the Milky Way Galaxy
Moorits Mihkel Muru,Joseph Silk,Noam I. Libeskind and Stefan Gottlöber,Yehuda Hoffman
Physical Review Letters Published: 16 October, 2025
DOI: https://doi.org/10.1103/g9qz-h8wd
Abstract
The strongest experimental evidence for dark matter is the Galactic Center gamma-ray excess observed by the Fermi telescope and even predicted prior to discovery as a potential dark matter signature via weakly interacting massive particle dark matter self-annihilations. However, an equally compelling explanation of the excess gamma-ray flux refers to a population of old millisecond pulsars that also accounts for the observed boxy morphology inferred from the bulge old star population. We employ a set of Milky Way-like galaxies found in the hestia constrained simulations of the local universe to explore the rich morphology of the central dark matter distribution, motivated by the GAIA discovery of a vigorous early merging history of the Milky Way galaxy. We predict a significantly nonspherical gamma-ray morphology from the weakly interacting massive particle interpretation. Future experiments, such as the Cherenkov Telescope Array, that extend to higher energies, should distinguish between the competing interpretations.
