Past exam of the mathematics course of the University of Cambridge / 2026 / iii / Paper 346 / 1 / viii / Solution Created 2026-09-24 Updated 2026-09-25
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Diffuse Galactic gamma-ray emission is produced by neutral-pion decay after collisions of cosmic-ray nuclei with gas, electron bremsstrahlung in gas, and inverse-Compton scattering of relativistic electrons from starlight and microwave photons. Compact objects and supernova remnants add resolved sources. Gamma rays therefore probe cosmic-ray populations, their target gas or radiation fields, and particle acceleration.
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