A GeV-TeV particle component and the barrier of cosmic-ray sea in the Central Molecular Zone
arXiv:2012.05524 · doi:10.1038/s41467-021-26436-z
Abstract
Cosmic rays are important probe of a number of fundamental physical problems such as the acceleration of high and very high energy particles in extreme astrophysical environments. 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 component of TeV-PeV cosmic rays in the vicinity of the Galactic center. Here we report the identification of GeV-TeV cosmic rays in the central molecular zone with the -ray observations of the Fermi Large Area Telescope, whose spectrum and spatial gradient are consistent with that measured by the Imaging Atmospheric Cherenkov Telescopes but the corresponding cosmic-ray energy density is substantially lower than the so-called cosmic-ray sea component, suggesting the presence of a high energy particle accelerator at the Galactic center and the existence of a barrier that can effectively suppress the penetration of the particles from the cosmic-ray sea to the central molecular zone.
11 pages, 5 figures, matches version published in Nature Communications
References in corpus (14)
- Giant Gamma-ray Bubbles from Fermi-LAT: AGN Activity or Bipolar Galactic Wind?
- The spectrum of isotropic diffuse gamma-ray emission between 100 MeV and 820 GeV
- Background model systematics for the Fermi GeV excess
- Detection of large-scale X-ray bubbles in the Milky Way halo
- Spatial distribution of interstellar gas in the innermost 3 kpc of our Galaxy
- GeV excess in the Milky Way: The Role of Diffuse Galactic gamma ray Emission template
- Inflation of 430-parsec bipolar radio bubbles in the Galactic Centre by an energetic event
- The Galactic Centre Chimney
- Wild at Heart:-The Particle Astrophysics of the Galactic Centre
- MAGIC observations of the diffuse -ray emission in the vicinity of the Galactic Centre
- Characterizing the Nature of the Unresolved Point Sources in the Galactic Center
- Cosmic Rays in a Galactic Breeze
- Probing local cosmic rays using Fermi-LAT observation of a mid-latitude region in the third Galactic quadrant
- Cosmic-ray Particles in the Galactic Center: Blowing in the Wind