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Cosmic rays are important probe of a number of fundamental physical problemssuch as the acceleration of high and very high energy particles in extremeastrophysical environments. The Galactic center is widely anticipated to be animportant cosmic-ray source and the observations of some Imaging AtmosphericCherenkov Telescopes did successfully reveal a component of TeV-PeV cosmic raysin the vicinity of the Galactic center. Here we report the identification ofGeV-TeV cosmic rays in the central molecular zone with the $\gamma$-rayobservations of the Fermi Large Area Telescope, whose spectrum and spatialgradient are consistent with that measured by the Imaging Atmospheric CherenkovTelescopes but the corresponding cosmic-ray energy density is substantiallylower than the so-called cosmic-ray sea component, suggesting the presence of ahigh energy particle accelerator at the Galactic center and the existence of abarrier that can effectively suppress the penetration of the particles from thecosmic-ray sea to the central molecular zone.

A GeV-TeV particle component and the barrier of cosmic-ray sea in the Central Molecular Zone