Journal
SCIENCE
Volume 326, Issue 5956, Pages 1080-1082Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.1178826
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Funding
- German Ministry for Education and Research (BMBF)
- Max Planck Society
- French Ministry for Research
- CNRS-IN2P3
- CNRS
- UK Science and Technology Facilities Council (STFC)
- IPNP of Charles University
- Polish Ministry of Science and Higher Education
- South African Department of Science and Technology
- National Research Foundation
- University of Namibia
- CAPES Coordenacao de Aperfeicoamento de Pessoal de Nivel Superior Foundation
- Ministry of Education of Brazil
- Max-Planck-Gesellschaft
- STFC [ST/G003084/1, ST/F002963/1, PP/E001319/1] Funding Source: UKRI
- Science and Technology Facilities Council [PP/E001319/1, ST/G003084/1, ST/F002963/1] Funding Source: researchfish
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Starburst galaxies exhibit in their central regions a highly increased rate of supernovae, the remnants of which are thought to accelerate energetic cosmic rays up to energies of similar to 10(15) electron volts. We report the detection of gamma rays-tracers of such cosmic rays-from the starburst galaxy NGC 253 using the High Energy Stereoscopic System (H. E. S. S.) array of imaging atmospheric Cherenkov telescopes. The gamma-ray flux above 220 billion electron volts is F = (5.5 +/- 1.0(stat) +/- 2.8(sys)) x 10(-13) cm(-2) s(-1), implying a cosmic-ray density about three orders of magnitude larger than that in the center of the Milky Way. The fraction of cosmic-ray energy channeled into gamma rays in this starburst environment is five times as large as that in our Galaxy.
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