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Detection of gamma rays from a starburst galaxy
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Publication
Detection of gamma rays from a starburst galaxy
2009
Overview
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 ~1015 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 ± 1.0stat ± 2.8sys) × 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
Publisher
AAAS,American Association for the Advancement of Science,The American Association for the Advancement of Science,American Association for the Advancement of Science (AAAS)
Subject
/ Cosmic rays (including sources, origin, acceleration, and interactions)
/ Density
/ energy
/ Exact sciences and technology
/ Galaxies
/ High Energy Astrophysical Phenomena
/ Physics
/ Protons
/ Quasars. Active or peculiar galaxies, objects, and systems
/ Starburst galaxies and infrared excess galaxies
/ Stellar systems. Galactic and extragalactic objects and systems. The universe
/ Unidentified sources and radiation outside the solar system
