Karlsruhe 2024 – scientific programme

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T: Fachverband Teilchenphysik

T 80: Invited Topical Talks 6

T 80.3: Invited Topical Talk

Thursday, March 7, 2024, 15:00–15:30, Geb. 30.22: Gaede-HS

Acceleration and transport of relativistic electrons in the parsec-scale jets of the microquasar SS 433 — •Laura Olivera-Nieto — Max-Planck-Institut für Kernphysik, Heidelberg, Germany

The microquasar SS 433 provides a unique opportunity to study relativistic collimated jets. In contrast to the precessing inner jets, the larger-scale jet dynamics remain poorly understood. Here I will present results from the High Energy Stereoscopic System (H.E.S.S.), which reveal an energy-dependent shift in the position of the gamma-ray emission of the outer SS 433 jets. These observations, which trace the energetic electron population, confirm an inverse-Compton origin of the gamma rays. Our analysis of the energy-dependent gamma-ray morphology establishes the location of particle acceleration and requires an abrupt deceleration of the jet flow. We find strong evidence for the presence of shocks 25-30 pc either side of the binary system. That the self-collimation of the precessing jets forms such efficiently accelerating shocks strengthens claims that a similar process takes place in other sources hosting powerful relativistic jets.

Keywords: gamma-ray observations; astrophysical jets; microquasar; shock acceleration; HESS