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National Repository of Grey Literature 2 records found  Search took 0.00 seconds. 
Simulation of rings surrounding the progenitor of SN1987A
 Jireš, Michal ; Pejcha, Ondřej (advisor) ; Calderón Espinoza, Diego Nicolas (referee)
SN1987A, the first supernova visible by the naked eye since 1600s, is anomalous by existence of preexisting triple ring nebula around it. One candidate explanation of the nebula is a binary merger of SN1987A's progenitors. This was already modelled in previous work with smoothed-particle hydrodynamics code GADGET. This thesis aims to replicate this model using mesh-based hydrodynamics code Athena++ and compare it. We focus on ejected mass per latitude distribution and total ejected mass. 1
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Particle acceleration and magnetic-field amplification in the termination shocks of AGN jets
 Pulnova, Yelyzaveta ; Araudo, Anabella Teresa (advisor) ; Calderón Espinoza, Diego Nicolas (referee)
The origin of Ultra-High-Energy Cosmic Rays (UHECRs) is still an open question in Astrophysics. The scope of this thesis is the study of the termination shocks in the jets of radiogalaxies 3C 105, 3C 227, and 3C 445 as cosmic rays accelerators. We assume the diffusive shock acceleration (DSA) and that the maximum energy is determined by the escape of cosmic rays downstream of the shock due to the magnetization. We find maximum achievable energy of non-thermal electrons and protons, which appeared to be only~TeV. Therefore the reverse shocks of AGNs' jets are not the sources of UHECRs. We also implement the model, where the scattering centers for the DSA emerge from the non- resonant hybrid instabilities in plasma. We take into account the results from the numerical simulations and observations that indicate the amplification of the magnetic field by orders of magnitude, and we obtain results that qualitatively fit the simulation outcome.
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