COS-B observation of high-energy gamma-ray emission from the Orion cloud complex

Astronomy and Astrophysics – Astronomy

Scientific paper

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Cos-B Satellite, Gamma Ray Astronomy, Molecular Clouds, Orion Nebula, Cosmic Rays, Galactic Radiation, Particle Energy

Scientific paper

Emission of high-energy gamma rays (between 70 and 5000 MeV) has been observed from the direction of the Orion cloud complex by the COS-B satellite. The emission is resolved and the existence of structure is apparent within the excess with two maxima coinciding with L 1630 and L 1641, i.e. the northern and the southern major clouds in the complex. The flux is evaluated and, coupled with an emissivity value deduced for the same general region of the sky, yields a total mass for the complex well in agreement with independent radio astronomical evaluations.

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