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Cosmic Ray Leptons Escaping from CTA 1?

Presentation #201.05 in the session Recent Advances in Pulsar Wind Nebulae.

Published onJul 01, 2023
Cosmic Ray Leptons Escaping from CTA 1?

Many Galactic TeV sources are associated with middle-aged (~104-5) pulsar wind nebulae (PWNe), with the γ-ray emission extending beyond the X-rays. This suggests that high-energy e± first escape from the PWN, and then produce the γ-rays through inverse Compton (IC) scattering. However, how they escape from the PWN is poorly understood, in part because there are very few examples of systems where the particles are ’caught in the act’ of escaping from the PWN. Understanding this process requires spatially-resolved measurements of the diffuse, X-ray spectrum of the extended TeV source. We have analyzed a deep 120 ks XMM observation of the PWN in CTA 1, and made spatially resolved measurements of its spectral properties. These measurements are suggestive of high-energy e± ‘caught in the act’ of escaping from the PWN.

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