Clusters of Black Holes as Point-Like Gamma-ray Sources

TL;DR

This paper explores how clusters of primordial black holes, formed through known supermassive black hole formation scenarios, could be observed as gamma-ray sources due to Hawking evaporation, with detailed modeling of their formation and emission.

Contribution

It introduces a model for primordial black hole clusters that can be detected as gamma-ray sources, linking black hole formation scenarios to observable phenomena.

Findings

Clusters of primordial black holes with ~10^{15} g can be gamma-ray sources due to Hawking evaporation.

Typical cluster mass is around 10 solar masses.

Detailed formation models support the observability of these black hole clusters.

Abstract

The possibility of identifying some of Galactic gamma-ray sources as clusters of primordial black holes is discussed. The known scenarios of supermassive black hole formation indicate the multiple formation of lower-mass black holes. Our analysis demonstrates that due to Hawking evaporation the cluster of black holes with masses about $10^{15}$ g could be observed as a gamma-ray source. The total mass of typical cluster is $\sim 10 M_\odot$. Detailed calculations have been performed on the basis of specific model of primordial black hole formation.