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• W2097760814 startingPage "A7" @default.
• W2097760814 abstract "<i>Context. <i/>The Large Magellanic Cloud (LMC) is to date the only normal external galaxy that has been detected in high-energy gamma rays. High-energy gamma rays trace particle acceleration processes and gamma-ray observations allow the nature and sites of acceleration to be studied.<i>Aims. <i/>We characterise the distribution and sources of cosmic rays in the LMC from analysis of gamma-ray observations.<i>Methods. <i/>We analyse 11 months of continuous sky-survey observations obtained with the Large Area Telescope aboard the Fermi Gamma-Ray Space Telescope and compare it to tracers of the interstellar medium and models of the gamma-ray sources in the LMC.<i>Results. <i/>The LMC is detected at 33<i>σ<i/> significance. The integrated <i>><i/>100 MeV photon flux of the LMC amounts to (2.6 <i>±<i/> 0.2) × 10<sup>-7<sup/> ph cm<sup>-2<sup/> s<sup>-1<sup/> which corresponds to an energy flux of (1.6 <i>±<i/> 0.1) × 10<sup>-10<sup/> erg cm<sup>-2<sup/> s<sup>-1<sup/>, with additional systematic uncertainties of 16%. The analysis reveals the massive star forming region 30 Doradus as a bright source of gamma-ray emission in the LMC in addition to fainter emission regions found in the northern part of the galaxy. The gamma-ray emission from the LMC shows very little correlation with gas density and is rather correlated to tracers of massive star forming regions. The close confinement of gamma-ray emission to star forming regions suggests a relatively short GeV cosmic-ray proton diffusion length. <i>Conclusions. <i/> The close correlation between cosmic-ray density and massive star tracers supports the idea that cosmic rays are accelerated in massive star forming regions as a result of the large amounts of kinetic energy that are input by the stellar winds and supernova explosions of massive stars into the interstellar medium." @default.
• W2097760814 created "2016-06-24" @default.
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