Diffuse gamma-ray emission in the vicinity of open cluster Berkeley 87
astro-ph.HE
Submitted: 2026-05-17
Updated: 2026-09-22
Journal ref: 2026MNRAS.tmp.1572O
License: http://creativecommons.org/licenses/by/4.0/
The gist: Young massive stellar clusters have been recognized as a significant population of cosmic ray accelerators and gamma-ray sources.
Terminology
Abstract
Young massive stellar clusters have been recognized as a significant population of cosmic ray accelerators and gamma-ray sources. We report the detection of extended gamma-ray emission toward the young massive star cluster Berkeley 87 using 18 years of Fermi-LAT data. The hadronic scenario is favored given the dense gas and the cluster's strong stellar winds. The cluster can supply sufficient energy to power the observed gamma-ray emission. A nearby pulsar, PSR J2021+3651, associated with the Dragonfly pulsar wind nebula and the 4HWC source 4HWC J2021+3650, lies in the same field of view. We also discuss the maximum accelerated proton energy and electron energy density of this pulsar.
Sources
- Search for Extended GeV Sources in the Inner Galactic Plane
- Young Massive Star Clusters as TeV Emitters: Constraints from H.E.S.S. and LHAASO
- naima: a Python package for inference of relativistic particle energy distributions from observed nonthermal spectra
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