Cosmic-ray distribution and the dynamic balance in the Large Magellanic Cloud

Astronomy and Astrophysics – Astronomy

Scientific paper

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Cosmic Rays, Gamma Ray Astronomy, Magellanic Clouds, Radiation Distribution, Density Distribution, Interstellar Matter, Synchrotron Radiation, Thermal Radiation

Scientific paper

The cosmic-ray energy density distribution for the LMC is calculated quantitatively based on the concept of dynamic balance and a scale of coupling between the cosmic rays and matter in a range allowed by present observations. Based on the very slowly varying ratio of the cosmic-ray electron to nucleon energy density ratio with relevant local galactic conditions and the close similarities to the galaxy, the cosmic-ray nucleon density distribution in the LMC is also determined from cosmic-ray electron density distribution deduced from synchrotron radiation measurements in a manner consistent with dynamic balance. It is seen that within uncertainties there is quantitative agreement between the two for a cosmic-ray, matter coupling scale of about 2.5 kiloparsecs both in terms of magnitude and distribution, thus supporting both the concept of dynamic balance and the galactic origin of the bulk of cosmic rays. Future gamma-ray astronomy measurement above 100 MeV will be able to provide a test of this cosmic-ray density distribution for the LMC.

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