PoS - Proceedings of Science
Volume 395 - 37th International Cosmic Ray Conference (ICRC2021) - GAD - Gamma Ray Direct
A new GeV-TeV particle component and the barrier of cosmic-ray sea in the CMZ region
X. Huang*, Q. Yuan and Y.Z. Fan
Full text: pdf
Pre-published on: July 05, 2021
Published on: March 18, 2022
The Galactic center is widely anticipated to be an important cosmic-ray source and the observations
of some Imaging Atmospheric Cherenkov Telescopes did successfully reveal a new component of
TeV-PeV cosmic rays in the vicinity of the Galactic center. This work reports the identification of
GeV-TeV cosmic rays in the central molecular zone with the gamma-ray observations of the Fermi-LAT.
The spectrum and spatial gradient of the GeV-TeV source component are consistent with that
measured by the Imaging Atmospheric Cherenkov Telescopes. The inferred cosmic-ray energy
density in the central molecular zone region is, however, substantially lower than the so-called
cosmic-ray sea component. Our finding is in support of the presence of a high energy particle
accelerator at the Galactic center and strongly suggests a barrier that can effectively suppress the
penetration of the particles from the cosmic-ray sea to the central molecular zone.
DOI: https://doi.org/10.22323/1.395.0645
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