Speaker
Dr
Ruizhi Yang
(Max-Planck-Institut für Kernphysik)
Description
We report the detection of diffuse gamma-ray emissions towards several massive star clusters in our Galaxy. The detailed spectral and spatial analysis reveal a remarkable constancy of the energy and radial distribution of the cosmic ray density,
w(E; r) ~ E^2.3 r^{-1} around these massive star clusters. The 1/r decrement of the CR density with the distance from the star cluster is a distinct signature of continuous injection of CRs and their diffusion through ISM. The analysis of gamma-ray data show that the hard energy spectra of parent protons continue up to 1 PeV. The results imply that the population of young massive stars can provide a substantial fraction of Galactic cosmic rays and are potential candidates of Galactic PeVatrons.
Primary author
Dr
Ruizhi Yang
(Max-Planck-Institut für Kernphysik)
Co-authors
Emma de Ona Wilhelmi
(CSIC-IEEC)
Prof.
Felix Aharonian
(Max-planck-instutut fur kernphysik)
