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  • Acceleration and transport of relativistic electrons in the jets of the microquasar SS 433
    Aharonian, F; F Ait Benkhali; Aschersleben, J; Ashkar, H; V Barbosa Martins; Becherini, Y; Bernlöhr, K; Böttcher, M; Bolmont, J; M de Bony de Lavergne; Bouyahiaou, M; Brown, A M; Bulik, T; Burger-Scheidlin, C; Caroff, S; Casanova, S; Cecil, R; Celic, J; Chand, T; Chen, A; Chibueze, J; Mbarubucyeye, J Damascene; Doroshenko, V; J -P Ernenwein; Filipovic, M; Gabici, S; Ghafourizadeh, S; Glawion, D; Haerer, L; Horns, D; Jamrozy, M; Jankowsky, F; Kasai, E; Katarzyński, K; Khélifi, B; Kluźniak, W; Komin, Nu; Kosack, K; Kostunin, D; Lang, R G; Leitl, F; Lemière, A; J -P Lenain; Leuschner, F; Lohse, T; Luashvili, A; Malyshev, D; Marandon, V; Martí-Devesa, G; Marx, R; Mitchell, A; Moderski, R; Mohrmann, L; Montanari, A; Murach, T; Nakashima, K; Niemiec, J; Ohm, S; Olivera-Nieto, L; Ostrowski, M; Panny, S; Panter, M; Peron, G; Prokhorov, D A; Pühlhofer, G; Punch, M; Quirrenbach, A; Reimer, A; Reimer, O; Renaud, M; Reville, B; Rowell, G; Ruiz-Velasco, E; Salzman, H; Santangelo, A; Sasaki, M; Schüssler, F; Sol, H; Specovius, A; Spencer, S; Stawarz, Ł; Steinmassl, S; Streil, K; Sushch, I; Suzuki, H; Takahashi, T; Taylor, A M; Terrier, R; Tsuji, N; Unbehaun, T; C van Eldik; Vecchi, M; Venter, C; Vink, J; Wach, T; White, R; Wierzcholska, A; Zdziarski, A A; Zech, A; Żywucka, N

    arXiv.org, 01/2024
    Paper, Journal Article

    SS 433 is a microquasar, a stellar binary system with collimated relativistic jets. We observed SS 433 in gamma rays using the High Energy Stereoscopic System (H.E.S.S.), finding an energy-dependent shift in the apparent position of the gamma-ray emission of the parsec-scale jets. These observations trace the energetic electron population and indicate the gamma rays are produced by inverse-Compton scattering. Modelling of the energy-dependent gamma-ray morphology constrains the location of particle acceleration and requires an abrupt deceleration of the jet flow. We infer the presence of shocks on either side of the binary system at distances of 25 to 30 parsecs and conclude that self-collimation of the precessing jets forms the shocks, which then efficiently accelerate electrons.

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