Gamma-rays from electrons accelerated by rotating magnetized White Dwarfs in Globular Clusters

TL;DR

This paper explores how relativistic electrons from magnetized White Dwarfs in globular clusters can produce detectable gamma-ray signals through inverse Compton scattering, potentially explaining observed gamma-ray sources.

Contribution

It presents a model predicting gamma-ray emission from White Dwarfs in globular clusters, linking stellar populations to high-energy astrophysical phenomena.

Findings

Gamma-ray flux levels are within reach of future Cherenkov telescopes.

A few thousand magnetized White Dwarfs can produce observable gamma-ray signals.

White Dwarfs can significantly contribute to globular cluster gamma-ray emission.

Abstract

Recently a substantial part of globular cluster population has been established as GeV gamma-ray sources by the Fermi-LAT telescope. We investigate possible production of the high energy gamma-rays by relativistic electrons injected from the population of fast rotating, magnetized White Dwarfs within the globular cluster. These electrons comptonize the radiation field within the globular cluster. We conclude that gamma-rays produced by electrons accelerated by the whole population of White Dwarfs within a specific cluster are on the level of detectability of the future Cherenkov telescope array provided that a few thousand of magnetized White Dwarfs have been created uniformly during the lifetime of the globular cluster.