Acceleration of petaelectronvolt protons in the Galactic Centre

Abstract

Galactic cosmic rays reach energies of at least a few Peta-electronvolts (1 PeV =$10^{15}$ electron volts). This implies our Galaxy contains PeV accelerators (PeVatrons), but all proposed models of Galactic cosmic-ray accelerators encounter non-trivial difficulties at exactly these energies. Tens of Galactic accelerators capable of accelerating particle to tens of TeV (1 TeV =$10^{12}$ electron volts) energies were inferred from recent gamma-ray observations. None of the currently known accelerators, however, not even the handful of shell-type supernova remnants commonly believed to supply most Galactic cosmic rays, have shown the characteristic tracers of PeV particles: power-law spectra of gamma rays extending without a cutoff or a spectral break to tens of TeV. Here we report deep gamma-ray observations with arcminute angular resolution of the Galactic Centre regions, which show the expected tracer of the presence of PeV particles within the central 10~parsec of the Galaxy. We argue that the supermassive black hole Sagittarius A* is linked to this PeVatron. Sagittarius A* went through active phases in the past, as demonstrated by X-ray outbursts and an outflow from the Galactic Centre. Although its current rate of particle acceleration is not sufficient to provide a substantial contribution to Galactic cosmic rays, Sagittarius A* could have plausibly been more active over the last $\gtrsim 10^{6-7}$ years, and therefore should be considered as a viable alternative to supernova remnants as a source of PeV Galactic cosmic rays.

29 pages, 7 figures, 3 tables, in press, for official published article see http://www.nature.com/nature/journal/v531/n7595/full/nature17147.html

References in corpus (42)

• The Galactic Center Massive Black Hole and Nuclear Star Cluster
• Cosmic-ray propagation and interactions in the Galaxy
• Propagation of cosmic-ray nucleons in the Galaxy
• Giant Gamma-ray Bubbles from Fermi-LAT: AGN Activity or Bipolar Galactic Wind?
• Energy spectra of gamma-rays, electrons and neutrinos produced at proton-proton interactions in the very high energy regime
• Observations of the Crab Nebula with H.E.S.S
• The Origin of Galactic Cosmic Rays
• Discovery of Very-High-Energy Gamma-Rays from the Galactic Centre Ridge
• Supernova remnants: the X-ray perspective
• Very high energy gamma rays from the direction of Sagittarius A*
• Calibration of cameras of the H.E.S.S. detector
• Background Modelling in Very-High-Energy gamma-ray Astronomy
• A high performance likelihood reconstruction of gamma-rays for Imaging Atmospheric Cherenkov Telescopes
• Cosmic ray acceleration and escape from supernova remnants
• Spatial distribution of interstellar gas in the innermost 3 kpc of our Galaxy
• Spectral imaging of the Central Molecular Zone in multiple 3-mm molecular lines
• Detection of Sub-TeV Gamma-Rays from the Galactic Center Direction by CANGAROO-II
• TeV Gamma-Ray Observations of the Galactic Center
• Observation of Gamma Rays from the Galactic Center with the MAGIC Telescope
• A lower limit of 50 microgauss for the magnetic field near the Galactic Centre
• Interacting Cosmic Rays with Molecular Clouds: A Bremsstrahlung Origin of Diffuse High Energy Emission from the Inner 2deg by 1deg of the Galactic Center
• Temporal and spectral gamma-ray properties of Mkn421 above 250 GeV from CAT observations between 1996 and 2000
• High energy gamma rays from the massive black hole in the Galactic Center
• Spectrum and variability of the Galactic Center VHE gamma-ray source HESS J1745-290
• The Origin of Diffuse X-ray and $\gamma$-ray Emission from the Galactic Center Region: Cosmic Ray Particles
• Echoes of multiple outbursts of Sagittarius A* revealed by Chandra
• Nonthermal particles and photons in starburst regions and superbubbles
• G359.95-0.04: Pulsar Candidate Near Sgr A*
• Inverse Compton Scenarios for the TeV Gamma-Ray Emission of the Galactic Centre
• TeV Emission from the Galactic Center Black-Hole Plerion
• Localising the VHE gamma-ray source at the Galactic Centre
• Spectral imaging of the Central Molecular Zone in multiple 7-mm molecular lines
• Acceleration of cosmic rays and gamma-ray emission from supernova remnants in the Galaxy
• Gamma-Rays and the Far-Infrared-Radio Continuum Correlation Reveal a Powerful Galactic Centre Wind
• Fermi-LAT observations of the Sagittarius B complex
• On the Detectability of High-Energy Galactic Neutrino Sources
• XMM-Newton observations of the Galactic Centre Region - I: The distribution of low-luminosity X-ray sources
• Very-high energy observations of the Galactic center region by VERITAS in 2010-2012
• Cosmic Ray Origin: Lessons from Ultra-High-Energy Cosmic Rays and the Galactic/Extragalactic Transition
• Study of the Gamma-ray Spectrum from the Galactic Center in view of Multi-TeV Dark Matter Candidates
• On the origin of galactic cosmic rays
• Obtaining cosmic ray propagation parameters from diffuse VHE gamma ray emission from the Galactic center ridge

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• Particle Diffusion and Acceleration in Magnetorotational Instability Turbulence
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