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M.V. del Valle, A. Araudo & F. Suzuki-Vidal (2022)
M.V. del Valle, A. Araudo & F. Suzuki-Vidal (2022)
We show that for a wide set of observationally constrained parameters, the combination of an adiabatic and a radiative shock is possible at the working surface of the termination region in jets from young stars and novae outflows. We find that instabilities are developed at the contact discontinuity, mixing the shocked materials. This scenario is very promising for particle acceleration and gamma-ray emission. The parameters for scaled laboratory experiments are very much in line with plasma conditions achievable in currently operating high-power laser facilities. This provides a new means for studying novae outflows that has never been considered before.
Adiabatic-radiative shock systems in protostellar jets: a key to enhance the gamma-ray emission
Adiabatic-radiative shock systems in protostellar jets: a key to enhance the gamma-ray emission
A. Araudo et al., Proceedings of the Gamma Ray Symposium (in press)
A. Araudo et al., Proceedings of the Gamma Ray Symposium (in press)
A double shock structure is expected to be formed in the termination region where protostellar jets impact the ambient medium. Adiabatic shocks are more efficient at particle acceleration while radiative shocks strongly compress the gas. Furthermore, a combined adiabatic-radiative shock system is very prone to develop instabilities in the contact discontinuity leading to mixing, turbulence and density enhancement. We study the combination of adiabatic and radiative shocks in protostellar jets. The hydrodynamical evolution of a jet colliding with an ambient medium is studied with 2D numerical simulations. Additionally, we explore the magnetic field amplification through the non-resonant hybrid (Bell) instabilities and the gamma-ray emission. We conclude that the coexistence of an adiabatic and a radiative shock is a very promising scenario for particle acceleration and gamma-ray emission through relativistic Bremsstrahlung and proton-proton inelastic collisions.
Multiple shock acceleration in active galactic nucleus jets
Multiple shock acceleration in active galactic nucleus jets
A.L. Muller & A. Araudo, Proceedings of the Gamma Ray Symposium (in press)
A.L. Muller & A. Araudo, Proceedings of the Gamma Ray Symposium (in press)
Radiogalaxies are the subclass of active galactic nuclei where large-scale relativistic jets are detected. In this work we study the acceleration of particles in a multiple shock scenario produced by the collision of the relativistic jets with embedded massive stars. We solve the transport equation taking into account not only the spatial and radiative losses but also the collective effect of the shocks and the possible reacceleration, and evaluate the maximum energies that the particles can achieve. Finally, we compute the gamma-ray emission expected in this scenario and discuss the detection possibilities.
A.L. Muller & A. Araudo (2023)
A.L. Muller & A. Araudo (2023)
Active galactic nuclei are one of the most promising sources for accelerating particles up to the highest energies. In this contribution, we present a scenario in which cosmic rays are accelerated in multiple shocks created by the interaction of relativistic AGN jets with the winds of embedded massive stars. We solve the Fokker-Planck equation considering escape and radiative losses as well as the collective effect of the shocks and the reacceleration of the particles. Finally, we calculate the maximum energies that the particles can achieve and discuss the possibility of producing ultra-high energy cosmic rays in this astrophysical situation.
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